EGR issues, please advise - Ford Mustang Forum
 
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post #1 of 4 (permalink) Old 09-16-2014 Thread Starter
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EGR issues, please advise

My engine recently threw a P0405 EGR valve code. I replaced the EGR valve, cleared the code and all seemed OK till the next morning when it threw the same code again. I replaced the MAF sensor to see if it would help but I keep getting the code. Engine has been running well before and after the replacement. What else should I try or look for?


2015 V6 Coupe, Oxford White
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post #2 of 4 (permalink) Old 09-17-2014
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Any other electrical issues, like a/c not engaging under the hood?
What did you replace the egr with?

How is the vacuum line to the EGR? Check the wiring from the egr, make sure it isn't torn nor chewed through.


Mike -- 2005 "The Beast" (Formerly a V6, now a forged/stroked 5.0L V8 sportn' a Kenne Bell 2.6L @18psi, and many mods
2006 4.0L w/Powerhouse turbo and TR-6060 :kooky:
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post #3 of 4 (permalink) Old 11-12-2014 Thread Starter
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Fixed... I think.

I broke the cardinal rule of Ford maintenance and replaced the EGR valve with an aftermarket unit. Once I put in a Motorcraft EGR the trouble code hasn't returned. However, while the EGR was having issues I noticed the car wasn't running as smooth as usual and the mileage was down a few MPG. Since replacing the EGR and with no more trouble codes, it seems like the car is still a little rough and mileage hasn't returned. Is there something more that needs to be done after replacing an EGR?

2015 V6 Coupe, Oxford White
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post #4 of 4 (permalink) Old 11-15-2014
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Are all vacuum lines connected? Is the egr exhaust pipe secure and tight? Is the connection at the intake manifold air-tight?

Also, there are a couple vacuum lines on the egr unit itself, and the connections can break on them and cause issues. But since you are not getting dtc's, those are probably ok.

It sounds like you make have a vacuum leak. Did the new egr have an o-ring on the end where it connects to the intake manifold? It should. (green o-ring shown in this pic)
http://i224.photobucket.com/albums/d...GRmodule-2.jpg

Mike -- 2005 "The Beast" (Formerly a V6, now a forged/stroked 5.0L V8 sportn' a Kenne Bell 2.6L @18psi, and many mods
2006 4.0L w/Powerhouse turbo and TR-6060 :kooky:
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