[yamin]

Originally didn't have a code - just a rough idle but smooth as soon as on the gas but that was with mainly highway driving. After more in-town driving got a P0171 code.

First thing we did was change the front top O2 sensor cause looked like original anyways but no difference. Visually checked all the most common trouble areas in the hoses for a leak and the pcv valve. Did a quick check of EGR valve on car to see if diaphragm ok and was.

Do not have a smoke machine so was going to try the cigar smoke route but my friend said to run a wand end (cutting torch end) connected to propane tank around the air lines. When we held under the EGR valve the idle smoothed out - when pulled away got rough. Thought then it was the EGR valve but when we pulled off could see the gasket was shot. Replaced this and has been fine with good idle and no codes.

(11-25-2013, 12:58 AM)ZTWsquared Wrote: Not sure why I didn't see this before but anyway thanks for the update. Do you remember what the exact code number was just in case anyone is searching on that.

And how did you figure this out btw - sounds like it might have been a tough nut to crack.

(11-24-2013, 03:58 AM)yamin Wrote: In case anyone else has this issue we found that the EGR valve gasket had started to break apart and created an air leak even though everything was still bolted together. Pulling off the valve and replacing gasket fixed the lean issue.