Hunting Idle and CEL

[WhiteKnight]

Ok, so I posted up on bf.c as well but I havent gotten too many responses.

This only happens once the car starts to warm up. The CEL is 1221 for the O2 sensor or a vacuum leak. It has a new O2 sensor now and I found two vac. lines that were bad and I replaced them. They were the ones coming from the valve cover. I also replaced the clip that connects them to the valve cover. I just cleaned out my ICV last night but it didnt look too bad. I need to put it back in today. The idle starts to hunt once it gets warmed up and it will die if it sits at idle too long after its completely warmed up. The DME has gotten wet recently. It got wet last thur. and this started before that if I remember right. Any help would be great. Im thinkin its the MAF at this point, but I can disconnect the MAF sensor and it gets a lot worse. Im seriously runnin out of ideas here. PLEASE HELP! Thanks!

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[Manolito]

I think that you are on the right track. When I have had trouble with hunting idle on my various vehicles, the problem was always an air leak somewhere.

Two things happen when the car warms up - 1) Mixture control goes closed loop so it is trying to precisely control its air/fuel mixture, so an air leak will drive it crazy, and 2) Everything metal expands so any gap between metal parts may open up wider, letting in more air.

Carefully examine the air tube from the MAF to the throttle body, and of course the tubes to the IAC. If you have a propane torch or a can of starter fluid, spray around the intake manifold while the car is running to see if you have a vacuum leak where the manifold meets the head, or anywhere else. Also, if you have a volt/ohm meter, check your throttle position sensor, I have posted the Ohm readings here before so they should turn up on a search. Trouble is that I don't recall whether I posted instuctions for OBDI or II. I think they are slightly different.

[WhiteKnight]

I think Ive fixed my vac. leak. Im pretty sure that I fried my DME. I had taken it through a carwash and then it was having issues. My OBC was telling me that I was getting 10 MPG and while I was idling the MPG was dropping. It would appear that my DME is dumping fuel into my car. I cant find anything else thats wrong with it at this point.

[WhiteKnight]

My DME was corroded so I cleaned it and it works fine now-