I have Hooker Longtubes and off road Y-pipe just the other day there was a strong downpour on the way home from work and in the process of driving slowly in traffic I noticed that the car was skipping some and my air/fuel gauge was all the way on rich about 30 sec. later the SES light came on and began to flash while the gauge stayed all the way rich. I got the car to a friends house it continued to skip and flutter some on the way. I got there let it sit for a bit reset the PCM the light went off and after about 5 min or so the gauge began to lean out some but still sat on green. I continued to drive when it started to pour again the gauge went all the way rich and the same thing happened. So I figured I would go ahead and get it home and leave it there until it dried up. That night after rain passed I got in the car it was on rich to start with and flutterd a bit light came on and then smoothed out and was running fine so I reset the PCM again. Problem is it does it pratically everytime I start the car now runs rich and flutters for about 20-30 sec almost like a miss fire and then gauge starts actively moving and car runs fine until I turn it off and turn it back on after a little while the light doesn't come on anymore though. You can smell the fumes of gas very strongly on start up when the car does this. Something is causing it to run very rich for that short period of time. I was kind of wondering if the sims could have possibly gotten damaged in water or is that even possible they seem very sealed I have them tucked pretty high up or is their something else like plugs or something it seems like a miss fire. Sorry for the long post any help or advice someone could provide would be greatly appreciated. Thanks.

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ttt

 

O2 simms have noting to do with A/F. They are for the cats that you no longer have. A/F is set by info from the front O2's.

 

Moving to Computer & Tuning section.

 

Yep its the O2 my did the same thing, the car just started running bad and the SES was flashing, look at the exhaust it will be black as hell, the A/F will be effected as the fuel system starts dumping fuel in like crazy. The Shop could not find the problem but I told them under very light throttle I could recreate it. They had the scanner on and so the A/F goes nuts and the ses was flashing, bad deal is it does not throw a code but the scanner saw low voltage on O2, we changed it and the problem was solved.

Ozz

Ozz

 

Just to be clear on this it is NOT the SIM it is the sensor, the issue is much worse as the weather cools, mine did it only a few times till we got the cool weather last weekend and then mine went all to heck. The flashing SES means you are damaging your CATs so its best not to let this go very long.

Ozz

 

I appreciate the info it definatly sounds like the O2 so I'll go ahead and replace it. Thanks Again.