How To Clean Egr Valve On My 2002 Duramax

Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control technology.

Has your EGR valve (your Frazzle Gas Recirculation valve) gone bad? Maybe. I'll tell you the symptoms below. But before y'all start replacing parts, keep in mind that the same engine performance problems that bespeak a bad EGR valve can too indicate problems in other parts of the system. If you don't do your troubleshooting, you may end up replacing parts unnecessarily and wasting time and money.

This article volition tell yous several things:

the symptoms of a bad EGR valve;
how to start investigating whether the trouble is your EGR valve or something else;
what the EGR valve does and how information technology works;
and the dissimilar types of EGR valves.

EGR valve passages plugged with carbon deposits.

Photo courtesy of Moosealope on Flickr

Symptoms of a Bad EGR Valve

Symptoms of a bad EGR valve include:

rough idling or stalling
a smell of fuel
increased fuel consumption
pinging, tapping, or knocking sounds
failed smog test
Bank check Engine Light on

Another symptom y'all may not run into often is a misfire. The misfire is actually caused by chock-full passages in the intake manifold.

Carbon buildup from frazzle gases flowing through the EGR valve may restrict flow to i or more than cylinders. The residue of the cylinders then will get all the exhaust flow, leading to the misfire.

The intake ports and EGR valve itself may also accept carbon deposits. All these passages and ports volition need to be cleared.

Valve Stuck Open up vs. Valve Stuck Shut

Actually there are two kinds of bad EGR valves, with dissimilar symptoms. An EGR valve tin neglect in two ways: It tin can be open all the time, or it tin can be closed all the fourth dimension.

If the EGR Valve Sticks Open:

This volition crusade a continuous flow of exhaust gases into the intake manifold. You'll notice one or more of the following symptoms:

A rough idle upon starting the engine (that is, when the engine is cold) and sometimes at a end lite or while looking for a spot in a parking lot (that is, at low engine speeds in a warmed-up engine).
Stalling when the engine idles.
Increase in fuel consumption.
A slight—or strong—fuel odor while operating the vehicle, because of the increase in hydrocarbons leaving the tailpipe (encounter the next symptom).
Your motorcar fails the emissions test. When the engine is running at low RPM, lower temperatures in the combustion chambers prevent all the fuel from burning, and so the flow of unburned hydrocarbon gases coming out of the tailpipe increases significantly.
The Check Engine calorie-free (or Malfunction Indicator Low-cal, MIL, depending on your model) illuminates on your dashboard.
You lot experience the engine has low power, especially at low speeds.

If the EGR Valve Sticks Closed:

This will permanently cake the menstruum of frazzle gases into the intake manifold. You'll notice one or more of the following symptoms:

A pinging or tapping noise coming from the engine at depression RPM (at speeds college than idle). The noise is the sound of early ignition of the fuel when information technology meets loftier temperatures.
Loud detonations. A second ignition tin can happen after the normal ignition, and the two tin combine with enough power to cause engine damage.
Your car fails the emission exam. Loftier temperatures in the combustion bedroom permit the excessive germination of oxides of nitrogen, which are released through the tailpipe.
The Check Engine calorie-free, or Malfunction Indicator Light (MIL), illuminates on your dashboard.

Troubleshooting: Is It the EGR Valve or Something Else?

To make things even more complicated, the same engine functioning problems that indicate a bad EGR valve can too point bug in other parts of the arrangement:

Curlicue to Continue

The EGR'due south Chore: Processing Exhaust Gases

The outside air picked up through the engine's intake manifold contains shut to 80 percent nitrogen and twenty percent oxygen, along with modest amounts of other elements. When outside air combines with the fuel and ignites in the combustion chamber, temperatures can reach above 2500^o F (or 1370^o C). Combustion at these temperatures burns the commonly inert gas nitrogen, creating oxides of nitrogen (NOx) gases, which cause air pollution and human health problems.

However, when the burned exhaust gases are introduced dorsum into the combustion chamber through the EGR valve, temperatures decrease, inhibiting the formation of NOx gases.

What the EGR Valve Does

The EGR valve is a minor component designed to allow the flow of frazzle gases into the intake manifold in controlled amounts. As such, information technology's a simple valve that closes and opens every bit needed.

The EGR valve has ane single job to do, regardless of the system configuration, type of control and number of sensors: that is, to either open up and direct frazzle gases into the combustion sleeping accommodation, or to close and keep them from entering.

Whenever you outset the engine, the valve comes alive and waits in a airtight position, blocking the flow of frazzle gases.

In one case the engine reaches operating temperature and speed increases, the valve—either through vacuum or electronic control—gradually opens, allowing burned exhaust gases to enter and combine with the air-fuel mixture inside the combustion chamber. If you lot slow downwards sufficiently or come to a end, the valve gradually closes and blocks the flow of exhaust gasses. And the process continues for every bit long every bit the engine is running.

After you shut off the engine, the EGR valve closes and remains in that position.

Types of EGR Systems

Gasoline and diesel-powered engines on the route today may apply one of several different EGR valve configurations.

On older vehicle models, you'll recognize the EGR valve equally a round, thick metal disc nearly 3 inches in diameter, commonly towards the top of the engine and on the side. On these older models, a pocket-sized-diameter vacuum hose operates a bones EGR valve. The hose connects the top of the valve to the throttle body or carburetor. The valve'due south metal deejay houses a vacuum diaphragm, spring, and plunger.
Later models come up equipped with electronic-vacuum EGR valves within a pocket-size cake or cylinder. The valve works the aforementioned manner equally in older models, except that an electronic EGR position sensor communicates with the car's computer for better command. Y'all may see electric solenoids connected through vacuum lines to the valve as well.
Newer vehicle models use electronic EGR systems that may include additional components, even a digital valve that eliminates the demand for vacuum control altogether.
A more radical pattern, implemented in a few models, was the replacement of the valve with EGR jets at the bottom of the intake manifold.
Some newer high-efficiency engines, for example those with variable valve timing (VVT), don't even utilise an EGR system.

Types of EGR Valves

Vacuum-controlled EGR valve
Back-pressure EGR valve
Electronic vacuum-controlled EGR valve
Digital EGR valve
EGR jet (in place of EGR valve)

Locating the EGR on a Corvette and on a Truck

Bad EGR valve symptoms vary and resemble problems in other engine systems. Merely now that you know the blazon of symptoms a troubled EGR valve will produce, include it in your troubleshooting tests. And restrain yourself from swapping components trying to prepare the problem before knowing which office is causing yous problem. Most of the time, you lot'll only spend fourth dimension and money unnecessarily. Troubleshoot your EGR valve and other components.

Examination Your Noesis

For each question, choose the best answer. The answer cardinal is below.

Which condition does NOT betoken to a potentially failed EGR valve?
- Excessive oxides of nitrogen
- Excessive hydrocarbon
- Excessive hydrocarbon and carbon monoxide
Which of these is NOT a symptom of an EGR valve stuck open?
- Rough idle and stalling
- A scent of fuel
- High oxides of nitrogen (NOX) results on emissions test
Which of these is NOT a symptom of an EGR valve stuck airtight?
- Pinging or borer
- Loud detonations
- High hydrocarbon (HC) results on emissions test
What else, besides an EGR valve stuck open, can cause high hydrocarbon emissions?
- Bad oxygen sensor
- Warped rotors
- Transmission fluid leak

Respond Key

Excessive hydrocarbon and carbon monoxide
High oxides of nitrogen (NOX) results on emissions examination
High hydrocarbon (HC) results on emissions test
Bad oxygen sensor

This content is accurate and true to the all-time of the author's cognition and is not meant to substitute for formal and individualized advice from a qualified professional person.

Questions & Answers

Question: I have had my EGR valve cleaned and then replaced in my 2002 Ford Tauras which has 49,000 miles. At present it idles rough and the check engine light came dorsum on. What could be the result?

Answer: If the trouble codes point to the EGR, then there's possibly something wrong in the system. It depends on the codes. Make sure the circuits (wiring) are checked as well.

Question: I accept a Hino 2011 268, and the SCR malfunction light turns on and off. What is wrong?

Answer: There could be an intermittent problem with the SCR organization. You lot may be able to get the codes. This video may give y'all an thought of how to go the codes yourself:

https://www.youtube.com/sentinel?five=VLf3dgDlLoY.

Question: If I take a bad EGR valve, will it throw a code for a misfire in cylinder number 2?

Answer: A bad valve near likely volition cause a random misfire since it doesn't direct exhaust gases to a particular cylinder. If you are getting a code for the number two cylinder, check the injector, spark, or fuel problems for that cylinder.

Question: Why would the EGR valve leak oil?

Respond: The oil may come through a seal from the actuator rod which somehow connects to the crankcase ventilation (CCV) arrangement. This seems to be a recurrent problem on some models. Yous may try replacing the EGR valve and run across if the trouble doesn't return.

Question: My 98 Lexus ES300 has codes po001/po004, can the EGR ready off those codes?

Respond: The description for these codes indicate to the electrical circuit that connects the fuel force per unit area regulator to the car computer.

Check first for proper connections and corrosion, a leak on the pressure regulator or declining pump.

If the fuel rail on your engine has a fuel shut-off, check that one too.

Question: I tapped my cars EGR valve when the engine was running and automatically it switched off. Later on trying to start it, it produced a fuel odor and doesn't start. What could exist the problem?

Answer: Probably tapping the valve didn't affect the engine straight. If the diaphragm in the valve was already damaged probably. If the valve is stuck open, it tin crusade a crude idle, stall and increase fuel consumption (fuel odor y'all're are able to smell during engine operation). This other mail may help you test the valve:

https://hubpages.com/machine-repair/How-to-Examination-an-EG...

Question: I am driving a Mazda 2 DE. And when I disassembled the EGR, it's filled with water flowing out. My EGR is not water cooled. Thus, there shouldn't be h2o in there. Would this exist a sign of leaking head gasket with coolant seeping into the cylinder area?

Respond: If at that place's coolant, you may accept a cracked head, gasket or block. But there could exist other symptoms also if this is the instance. If yous institute water, this nigh likely is the steam yous see coming out the exhaust (from fuel burning) when starting the engine, usually in cold temperature climates.

Question: I got my EGR valve changed. Now my auto cabin smells of exhaust fumes when my rut is on. What would cause this?

Answer: Check the EGR valve gasket. Make sure information technology was replaced and put in place correctly. The valve should exist properly installed. Or you may accept an exhaust leak. The fumes are probably going from the engine compartment, ventilation system, and the cowl next to the windshield. Y'all want to fix this equally before long as possible. Carbon monoxide is highly poisoning.

Question: I just had the EGR valve and its controller replaced. I was hoping this would turn off the cheque engine lite that goes on and off periodically. Non only did information technology not fix the check engine light, only now my car idles crude at stoplights and sometimes just at idle. My mechanic, when he replaced the EGR valve, said every bit I was leaving that it might take a piddling fourth dimension for the valve and the idle to the low-cal to become compatible? Exercise you know what he was talking near? Thanks.

Reply: I don't know what exactly he ways by "for the valve in the idle to the light uniform." Merely, if he asunder the battery while working on the EGR organisation, he might exist referring to the car'southward figurer relearning its idle and fuel trim strategy, which usually gets erased when power is disconnected. Information technology erases data from memory.

Also, do you know if he cleared whatsoever trouble codes from the figurer memory after replacing the valve? If not, you tin can go to a local auto parts store and enquire them to pull any trouble codes (so that you can verify the code relates to the EGR system) and have them articulate the memory. This could help. Also, you can wait for the figurer to relearn the strategy, which may have a few miles. Or you can check your vehicle repair manual and see if information technology gives you the procedure to perform the idle relearn process.

Question: I have a Crown Victoria that will not stay running unless my pes is on the gas, is it the EGR?

Reply: Check the idle air command (IAC) valve for proper operation or carbon buildup. Y'all'll demand to remove information technology and practise a visual inspection of the valve, every bit well as the ports.

Question: I have a 2008 Ford Crown Victoria PI. When I press the throttle speedily, at about a quarter to halfway at lower speeds, my engine hesitates and starts making a fast chattering/flapping sound from the engine bay, throughout acceleration. It lasts virtually two seconds or less. Then it stops. The car doesn't seem to lose power. Is this a bad EGR valve? At total throttle or higher speeds, information technology doesn't seem to do this. It sounds like air escaping a plastic flap valve.

Answer: I'yard thinking this is probably a sticking valve or need for aligning. Likewise, an exhaust leak tin too cause a tapping or flapping sort of dissonance and a lean condition (engine hesitation) because of the pull of actress air. A vacuum leak may also cause a lean condition under mild acceleration.

Question: The tube/cablevision connecting the idle air mass valve to the engine compresses when the engine starts in a Toyota Corolla 2009 after I had an engine change. Can someone delight help me? Mechanics tell me the valve (cable/tube) is weak only the problem persists upon change.

Respond: Y'all may be referring to the air hose air mass sensor kicking to idle control valve. If the hose is collapsing, and information technology's new, you probably need to buy an OEM function, using also the engine number since you changed engines. Probably you are all the same using the 1 for the previous model. Tell the parts person to take a look at the engine and run into if he can get the engine number for you.

Question: I accept replaced the EGR valve 2 times. Both time the error went straight away. And afterwards 1000 miles, the error came back. May I know what to exercise now?

Reply: One common issue with EGR valve issues are carbon buildup in the intake and/or exhaust passages. Sometimes, carbon builds upwardly deeper into the intake manifold and cause trouble. Check too the wiring and vacuum hoses (if applicable) that connect to the valve.

Question: I accept a '05 Dodge Ram 1500. When my truck is cold and I drive it and I reach a stop sign, my truck stalls and looses power. I don't know if it's my EGR valve or something else, simply doesn't throw me an EGR code. What could be the trouble?

Answer: At that place could be a problem in the fuel arrangement, bad air/fuel metering when the engine is common cold. The common faults are small vacuum leaks, unmetered air to the intake, bad coolant sensor, throttle position sensor faults, gluey (open) EGR valve. This other post may assist you with this upshot:

https://axleaddict.com/auto-repair/Why-My-Car-Stal...

Question: I replaced the EGR valve on my 1996 Toyota Camry and it still doesn't run strong, why?

Reply: There could be many other reasons for a lack of power. Probably this other postal service may assistance:

https://axleaddict.com/auto-repair/What-Causes-Low...

Question: I have a 05' Subaru with 2.5. Whenever pumping gas, the car would stall or wouldn't restart unless I held the gas pedal to the flooring. Now, the car volition run fine for a minute, and so run real rough before stalling. The throttle is unresponsive. I am not finding vacuum leaks. The car has new wires, plugs, coil and fuel pump. The EGR valve seems to get very hot compared to everything else. Practice you have any thoughts?

Reply: Bank check first for possible pending trouble codes, merely in case. It's normal for the EGR valve to go hot, simply if it's stuck open up, it can cause the engine to stall. Besides, check the throttle body for carbon build up around the bore and underneath the plate. Check the throttle position sensor. You may need your repair manual for this, but they're non hard to audit.

Question: I accept a 2007 Toyota Hilux KUN26R. The EGR valve was replaced, but still throwing P0400 code. Why?

Answer: There could be a trouble in the system'southward circuit. Make sure the valve is opening. If there's no vacuum or the solenoid is faulty, the valve will remain closed. Another common consequence is carbon buildup blocking the gas passages. Make sure intake passages are clear.

This other mail may help in your diagnostic also.

https://axleaddict.com/auto-repair/How-to-Examination-an-...

Question: Why would cold temperature not allow a starter to piece of work?

Reply: Cold temperature affects battery operation. This is the most common reason, specially if the bombardment is old or non operating properly. Make sure you have the right bombardment (CCA - common cold cranking amperage) for your model.

Not using the correct oil for the climate in your area can also affect your starter.

Check for clean and tight connections in the starting circuit, including the battery terminals.

Question: I have an sometime car that I have done a lot of piece of work to, and on my way habitation after a end light, I hit a higher rpm to shift up a hill. It hitting near 3500 rpm, and information technology cutting out, and had no throttle control. A few seconds later I had throttle control then it cut out over again. So like before it came back but it seemed like information technology didn't have as much power as it should. Could that be a bad EGR valve?

Reply: If your car has a throttle positon sensor, brand certain the betoken is increasing smoothly, if it skips it can have sometimes the same symptom. This might help:

https://hubpages.com/auto-repair/How-Exercise-You-Know-i...

Likewise, check the fuel system.

Question: Can an EGR valve force per unit area sensor stop your car from shifting out?

Reply: Performance wise, common bad sensor symptoms show up as engine hesitation, loss of power or even crude idle.

Question: I have a 2016 Nissan Navara NP300. Is it appropriate to block the EGR. I have heard that it is advisable to do so to prevent engine damage. What is your stance?

Answer: The EGR prevents the engine from overheating and forming NOx emissions (very toxic). And then information technology'southward better not to block it.

Question: I am getting a problem in the manual in my Ford Ranger XLT, and the visitor servicing the vehicle says it'southward the EGR causing that trouble. Does the EGR tin can affect the transmission?

Answer: The EGR valve affects the operation of the engine and the emission system direct. Only in mod vehicles, driveability bug can bear on transmission functioning. The EGR organisation being an example of this. And many shops are aware of this issue, specially with GM and Ford models. So, information technology is possible the EGR system is affecting your transmission.

Question:

I hear a sucking dissonance in my car engine. What does this hateful?

Answer: Perhaps this post tin can help:

https://hubpages.com/car-repair/How-to-Find-and-F...

Question: I take a 2009 Dodge Grand Caravan 4.0 L. Information technology cranks but will non start occasionally. It volition smell gas when this happens. I have changed the WIN Module/Cam and Creepo Sensors, but there is no lawmaking in the computer's retentiveness. Can an EGR valve stop my Contrivance Caravan from starting?

Answer: The smell of gas seems suspicious. Too much gasoline is probably flooding the engine. Yous might want to check the fuel injectors (possibly leaking) and fuel pressure. This post may help you:

https://axleaddict.com/auto-repair/How-to-Test-a-F...

Question: I have a 2009 Ford Focus 2.0. It starts bucking between 2500 and 3000 rpms. It runs fine when the EGR valve is disconnected. I replaced information technology to no avail. I also cleaned the MAP sensor to no avail. The EGR seems to open and close quickly when I have light pressure on the accelerator. There is no "check engine" lite. Is something upstream causing this?

Respond: There could be a problem with the DPFE sensor; it looks something like this:

https://world wide web.samarins.com/diagnose/sensors/dpfe-sen...

It could be a switching valve problem (vacuum supply problem).

Even if the CEL (engine lite) doesn't come on, bank check for pending codes.

Question: I have a 1989 Buick LeSabre three.08, and it volition backfire in the intake manifold. Information technology can as well exist hard to get-go like information technology'due south not getting gas, just once started information technology runs great. Could this be the EGR valve?

Answer: You might want to check this post:

https://hubpages.com/auto-repair/Engine-Backfires-...

Question: Tin a vehicle lose power if the EGR valve is bad?

Respond: Yes, it'southward possible.

Question: Tin can a bad EGR valve cause my vehicle to buck on dispatch and then stall out?

Answer: There could be several reasons for this, clogging fuel filter, problems with the ignition system or fuel system.

Question: I have a 2006 Audi A4 TDI. When I'thou about 1300m above sea level, the car operates fine, but when I become to the coast, the car loses ability as if the turbo stops working. I have taken it for Diagnostics with Audi. They say the EGR valve needs to exist replaced. Does this sound similar the cause of the problem?

Answer: The EGR system does demand to have a specific calibration to respond quickly to changes in demands to the pressure level in the intake system. In this item instance, it's hard to tell if the EGR system is the one afflicted more by the difference in pressure, but certainly, it is possible.

Question: Can I test an EGR valve by compressing the diaphragm and holding my finger where the vacuum line goes to see if it holds pressure level?

Answer: Yes, it is possible. But brand certain non to damage the diaphragm.

Question: I had an EGR valve neglect terminal week with the P0404 code. I replaced the EGR valve, and it was loaded with carbon buildup. I blew the surface area to endeavour to get rid of the carbon and then sprayed cleaner (carb cleaner) before putting the new function on. Information technology drives WAY better now, but the Bank check Engine lite simply came on again a week later and now is throwing the P0420 code, Catalyst system efficiency below threshold. Could information technology be cat failing because of all that carbon?

Answer: Make sure this is the but code the computer is throwing; otherwise, look first into the other codes. A blocked EGR valve tin cause combustion temperatures to rise, creating a lean status and raising exhaust temperature. This prevents the cat from working properly. If the EGR issue has been fixed (intake and valve passages clear, and the temperature is back to normal), try immigration reckoner codes as a P0420 can be the result of the previous issue.

If that doesn't fix the problem, information technology'due south possible the cat or one or more O2 sensors are covered with carbon deposits. Sometimes a cat cleaner will exercise the job, but you lot need to cheque if the sensors are withal working correctly. Otherwise, the problem with the true cat is more serious.

Maybe this other mail service tin help:

https://hubpages.com/auto-repair/How-to-Check-an-O...

Question: I've got the symptoms of a vacuum leak; aka high idle and no power. The car is idling at 1500 to 2000 rpm. Could the EGR cause this trouble? I tin non detect whatsoever vacuum leaks, and the EGR is the but component that I haven't changed however.

Answer: The EGR gasket may leak. If in that location are no other symptoms, the source could be somewhere else. Get the codes from the ECM first. The idle air control valve is another possibility. This one is piece of cake to remove and bank check. Check all vacuum hoses with a slice of hose to listen for noises around the engine.

Question: I have a 1986 Dodge Ram D150 that's been sitting for years. I got information technology started today, and in that location'due south smoke coming from underneath the EGR valve. Any idea of why this is happening?

Answer: The EGR valve gasket is probably leaking, allowing exhaust fumes to escape. Remove the valve, clean buildup around the valve and passages, if whatever, and replace the gasket.

Question: My car lost all power and would not commencement with the turn of keys. The "EGR" alarm light came on the dash--does that hateful that my engine needs replacing?

Answer: Information technology could be the valve itself or something in the circuit. Get the problem lawmaking and run across if it points to the valve. Even if the valve seems to be at error, it'south a good idea to test the valve. Sometimes another related trouble may brand the ECU 'remember' that the valve is at fault.

Question: I changed the plugs of my 1998 Ford f150 5.four, so the "bank check engine" low-cal checked. The shift solenoid B and EGR vacuum regulator is wrong. Could i of these codes brand the truck vibrate and run like I have bad plugs?

Respond: Usually, a bad shift solenoid can cause difficult shifts, cause the truck jerk when shifting, or shift erratically. Oftentimes, a bad EGR vacuum regulator tin can touch on power and increase emissions.

Question: I have a 1996 Acura and the trouble lawmaking reading was for the EGR valve. Will a bad EGR valve crusade white smoke? The car drives fine and a low-cal fume comes only when I'g at a red light. And and then take off I can come across thin white smoke. What does white smoke mean?

Answer: Usually, white smoke is associated with coolant leaking into the exhaust stream, while black smoke is oil getting into the cylinders from a bad piston ring, faulty valve seals or PCV system. This other mail may assistance:

https://axleaddict.com/motorcar-repair/Frazzle-Color-S...

Question: I have replaced the starter, alternator, fuel pump, spark plugs and wires on my 1998 Jeep Grand Cherokee, but it nonetheless won't first or information technology dies when it does. What else should I do?

Answer: Check the fuel force per unit area and compare it to specs. Yous'll need the repair manual for your model.

Question: I have a Passat B6 1.6 FSI. The check engine lite is on. I checked it on the reader and information technology says there is an EGR problem, and so I changed it with another one. I drove my auto for 100 km, then the light went on over again. I changed it once more, and the same thing happened. What should I do?

Answer: Bank check the definitions for the trouble codes; also, a mutual problem with EGR valves are the passages. Once yous remove the valve, you need to check/make clean intake passages from carbon deposits that might be obstructing frazzle catamenia towards the chambers. If there's an obstruction problem, the CEL volition keep coming on.

Question: Why is in that location a recirculation of frazzle gases in a motorcar?

Answer: It reduces the amount of harmful emission -- oxides of nitrogen (NOx). When yous mix frazzle gases with the air-fuel mixture, the temperature drops a little flake. This also helps avoid pinging or knocking.

Question: I take a Jaguar XF. The computer states I take a faulty EGR Valve. The only symptom I have is the auto won't do more than 50mph (ca. fourscore km/h) no thing how much I accelerate. Is it the ERG valve as the engine warning light comes on after about 30 minutes?

Respond: Information technology's better to exam the EGR valve and make sure there'due south where the problem is, even if the calculator points to the valve. There could be another problem causing the reckoner to go into limp or safe style to prevent more than damage. Y'all may need your vehicle repair transmission to examination the EGR valve.

Question: I have an '87 Nissan Hardbody D21 2WD standard shift. Information technology'south got the two.4L Z24 TBI. My EGR system, I retrieve, has caused head gasket damage. Could the EGR system harm the head gasket? I wanted to make certain it would be OK to delete the arrangement. I'm too going to repair the head gasket now. What's your opinion of the departure between the Bluish devil head gasket sealant or thermal gasket? I just bought the truck a few weeks ago.

Answer: A stuck-close or clogged EGR can increase engine temperature. If the trouble leads to detonations, it can damage the engine. So it's possible. This problem is more common with EGR libation failures when it causes loose of coolant. I personally wouldn't recommend deleting the system. It may lead to engine overheating, increase emissions, and driveability bug.

Aftermarket head gasket repair products can do the trick if the damage is not all-encompassing. However, the repair might not be permanent. That said, I've known of people that have some success with Blue Devil and Steel Seal. You may want to do some inquiry and see which will work best for the type of caput gasket you are using in your particular application.

Question: I accept 99 Chevy 1500. It gave a P0404 code. The guy said EGR valve but the symptoms don't match. It is only hard to start. Turns over but takes 10 tries sometimes. Earlier only when it sat for more than then 10hrs. now will do it even if it was started an hour before. Sometimes information technology starts after 1 or two but sometimes it volition impale the battery trying. Merely once it starts it is perfect tranquillity equally a mouse smooth. Doesn't cut off. Is that an EGR valve or why would it give p0404?

Answer: This is an electrically controlled valve. The problem could exist in the excursion. But the valve can be sticking open, which is reported to the PCM. Y'all may desire to endeavour first removing the valve and checking for carbon buildup. The valve tin exist checked with a scan tool and testing circuit voltages and grounds.

Question: I have a Dodge Quotient 2.0 CRD. It is running at nearly 150kph, and suddenly lost engine power with no boost. Could it be an EGR fault?

Answer: It seems like pressure built-in the tank (probably a suction control valve problem). Sometimes releasing the fuel cap can help.

Question: I have a 2002 Ford Escape. I inverse the EGR valve because information technology was getting hot and smoking and the rpm would become up merely no power. The new one is doing the aforementioned thing. What else could it be?

Answer: The EGR could be stuck open up. If the engine is fed exhaust fumes continuously, this can overheat the valve, cause poor acceleration. Check the EGR system and meet if a bad vacuum solenoid is keeping the valve opened. Check the command circuit likewise.

Question: I take a 96 Honda Borough bucks and it slips while trying to accept off?

Answer: Check the transmission fluid, level and quality - there could be some transmission problems.

Question: What other symptoms can cause an EGR valve to show that it'south bad or, in other words, causing the engine low-cal to stay on?

Respond: Maybe the EGR valve/intake passages are clogged, or there's a problem with the EGR system excursion. These other ii posts may help:

https://axleaddict.com/motorcar-repair/How-to-Examination-an-...

https://axleaddict.com/auto-repair/EGR-Valve-Clean...

Question: Why is my motorcar making a whining dissonance after I changed the EGR?

Answer: Bank check the EGR gasket under the valve. It is probably a leak. Torque the bolts to specs. Make certain the gasket is good though.

Question: Can the EGR valve exist closed with a plate on a Duramax Diesel fuel?

Answer: Information technology can be done with a blocker plate, if you lot find a reliable store to do it. It's possible that you'll demand to clean the valve once in a while if oil from the PCV valve begins to accumulate.

Question: My '96 Tahoe develops a front to rear jerking coming from the engine bay at highway speeds and under constant speed, non accelerating or decelerating. When I unplug the EGR wiring dongle the problem disappears. Any thoughts on this?

Reply: The EGR valve may exist getting stuck from carbon build up. The jerking yous are feeling is probably a vacuum leak. More air inbound the engine is upsetting the amount of fuel the computer call back it really needs. Cheque the valve and passages for carbon buildup. Probably other components in the system may exist causing this too.

Question: Would a bad EGR valve cause a motorcar to lose power and emit white smoke that smells like fuel?

Answer: Usually, white smoke is associated with coolant leak into the engine. This other post may requite more information:

https://axleaddict.com/auto-repair/Exhaust-Colour-Southward...