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What causes carbon build up in egr valve? - F-350 Ford Cars & Trucks

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5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

FoRdMaStEr
  • 51 Answers

SOURCE: no vacuum to egr valve

there is an EGR vacuum solenoid somwhere that controls on/off vacuum to actuate the valve. i am not to sure of the location, but follow the vacuum line back from the egr until you find a device that looks like an electrical check valve for vacuum. that is a possibilty. but then again i am a ford,chrysler guy and am just giving you an answer based on my understanding of the functuality of a vacuum egr system

Posted on Jan 15, 2009

jagjeffery
  • 316 Answers

SOURCE: P1401 still after replacing EGR pressure and EGR valve

Yes that is what is wrong the intake manifold is plugged with carbon restricting EGR flow you need to clean out the ports to correct the problem if you run the car to long you will burn the DPFE ( the EGR pressure sensor ) out agian

Posted on Jun 06, 2009

jbass706
  • 167 Answers

SOURCE: carbon build up under egr valve

An updated EGR spacer plate help to keep the buildup down, but some will always happen.

Posted on Oct 25, 2009

  • 1 Answer

SOURCE: I replaced my egr valve on my 2001 chevy venture 1 1/2 yrs ago,

I found an answer that worked for me here. (I have a 2001 Chevy Venture.) http://www.fixya.com/cars/t4093012-code_p1404_dodge_ram_1500_meanIn case links are not allowed, here's the text:That code is the EGR. I'd start by checking for a bad connection on the EGR plug-in. Pull the connector off and inspect each individual terminal inside the plug and the connector pins inside the EGR valve.
I found this solution at another forum on this issue. It worked on my 2001 Grand Am:

"Many GM built cars have a tendency to have the 'Check Engine Soon' light come on as a result of DTC code P1404. P1404 is described as EGR valve pintle stuck open, which in most cases is a false alarm. I had this happen with my '01 Grand Am. A little bit surfing on internet reveals that GM has a solution for the problem, a re-flash for the car's computer.

A software re-flash as a fix kind of indicates that the vehicles with this problem were built with it but I don't think GM will be re-flashing cars outside warranty for free. They will want their $100 for it.

Some hands on people I found had purchased a new EGR valve and changed it but the problem remained.

Possible reason (very likely) for the false P1404 code is that the plastic piston of the EGR valve position instrument (LVDT?) wears over time and starts reading a different position at valve closed than what it was when the EGR valve was first installed.

When the car was built and the computer circuits energized for the first time the computer learned the EGR valve closed position signal from the valve position instrument that is built on top of the valve itself. Over time, when the instrument wears, a slightly different signal is sent to the computer and when it differs enough from the 'Valve Closed Signal', that the computer had learned, the trouble code P1404 is set and the 'Service Engine Soon' light comes on.

Replacing the EGR valve with a new one does not necessarily fix this problem because the 'Valve Closed Signal' between valves is slightly different and it is just pure luck if your new valve would give a 'Valve Closed Signal' close enough to your original valve's signal not to set the trouble code. This is why the new EGR valve 'Valve Closed Signal' must be re-learned by the computer.

So, what this all means is that if the P1404 is a false code meaning that the valve pintle is not stuck open, then new 'Valve Closed Signal' can be re-learned by the computer using the old valve.

For fixing this problem the tool you need to have is a simple OBD II code scanner that can be used to erase trouble codes. There are many scanners of different price range on the market. I purchased one from AutoZone for about $90.

A code scanner is a very handy tool to have and I recommend everybody who is just slightly hands on type of a person to get one. It will end up saving a lot of money over time.

The fix goes like this:

1. Disconnect the wire harness from the EGR valve.

2. Turn key ON and erase the trouble code(s) from the car's computer AND TURN KEY OFF IMMEDIATELY WHEN THE SCANNER SAYS CODES HAVE BEEN ERASED. DO NOT TURN KEY ON BEFORE YOU RE-CONNECT EGR WIRE HARNESS.

3. Re-connect EGR wire harness and your problem should be fixed.

Posted on Dec 01, 2011

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1 Answer

How to fixt exhaust recirculation gas flow


Take the egr valve off and see if it needs cleaning or replacing. They get carbon build up around the lower pintle part, and may get stuck open or closed. Also clean the passages of carbon that the egr valve sits over. Scrape off and out all the old carbon deposits as best you can, then use a new egr valve gasket when you put the valve back on.
If it's not the egr valve itself causing the problem with exhaust recirculation, then the vacuum signal or the electrical signal (depending on how it is activated) will need investigating.

Apr 10, 2013 | 1998 Mazda Protege

1 Answer

Replace the EGR valve reset error code and now i get error code of p1407 what do i do now


The most likely cause of this code is a DPFE (differential pressure feedback EGR sensor).

The code 1407 indacates low or no EGR valve flow, this is normally caused by carbon build up in the passage in the intake where the valve mounts. Click over pic to see attachment...

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Hope this helps.

Feb 06, 2011 | 1995 Ford Mustang

1 Answer

Check engine light stays on the code that keeps coming up is P0401 changed egr valve clened out carbon build up also smell gas when first start not driving and fuel millage not as good car runs good though...


Could be a EGR vacuum issue or temp sensor issue

Common Problems That Trigger the P0401 Code
  • Restriction in the EGR passages, usually caused by carbon buildup
  • Lack of a proper vacuum signal to the EGR Valve from EGR Vacuum Solenoid
  • EGR Vacuum Modulator is defective
  • EGR Temperature Sensor is defective
  • EGR Valve is defective
This is from:
http://repairpal.com/OBD-II-Code-P0401-Ford

Jan 31, 2011 | 1998 Chevrolet Lumina

2 Answers

Service engine soon light on. code P1406


On chevey P1406 is the EGR pisition pentile circuit. So its telling you that its the EGR valve it self at the port in the intake manifold. You can try to clean this there must be carbon build up on the pentile . Howerver you must need a tune up or have something else that would cause this kind of a build up of carbon in the port . Or the valve could just be worn out you can check this by removeing the EGR valve flip it up side down spray some WD40 on the pentile valve if it leaks through the valve its no good

Jan 26, 2011 | 1996 Chevrolet Silverado 2500

1 Answer

12v does not idle, drives somewhat boggy, won't run without blipping the throttle constantly waiting for light to change. an error code came up a couple of weeks ago pointing to the egr valve, since then,...


problems are consistent with an egr problem before replacing try to clean carbon and free valve --remove egr and with a carb or brake cleaner clean the carbon the most common problem is carbon build up causing the valve to malfunction continue to drive can cause a full break down with the vehicle not starting or stalling while driving

Jan 19, 2011 | Audi 90 Cars & Trucks

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1994 CHEVY C1500 WITH HIGH NOX. I CAN NOT PASS THE INSPECTION.


SOUND LIKE EGR VALVE NOT WORKING NOT OPENING UP OR EGR VALVE PORT STOPPED UP WITH CARBON BUILD UP NEED TO BE CLEANED OUT.SCAN VECHICLE SEE IF EGR WORKING OR YOU HAVE FAULTY PCM.

Jan 09, 2011 | Chevrolet C1500 Cars & Trucks

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I have a 1995 GMC Jimmy,rough idle, carbon smell, strong gas smell coming from the left driver side, check engine light is on. Has a hard time turning on...Any suggestions?


My 94 Jimmy had similar problems, until the dirty EGR valve was replaced. We tried a million things, first. But the improvement with the new EGR valve has HUGE.

Nov 17, 2009 | 1995 GMC Jimmy

1 Answer

1995 blazer has rough idle, i replaced the EGR and TPS it ran great for 2 days and now is back to the rough idle.the comp codes are the same as before replacing the two parts,could one be defective,can...


When you changed the egr valve did you clean out the carbon build up inside the intake? if not that could be the problem, if you did, than a peace of the carbon got stuck in the valve, either way your local auto parts store sells a screaned gasget for the egr valve to prevent peaces of carbon from the intake geating into the egr valve, same exact thing happend to me on my 95 blazer.

Aug 23, 2009 | Chevrolet Blazer Cars & Trucks

2 Answers

Check Engine Light Just Came On..


Remove the EGR valve and clean it out. It's probably carboned up really bad constricting the exhaust flow. Also remove the EGR tubes and clean them out as well. I use brake cleaner and keep spraying the pieces out until it's pretty clean and re-assemble.

Feb 04, 2009 | 2000 Ford Explorer

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