Idle RPMS are high sometimes.
Hey fellas, i have a 1996 Concorde and i just replaced the intake manifold gaskets because of rough idling and surging. The rough idle is gone now and i am actually quite impressed with the difference that made. I also did the EGR valve while i had the plenum off because it was much easier to access. I have the 3.5L in mine.
The only problem i have is that it will idle a bit high sometimes and then return to normal. When i put load on it by turning the steering the rpms will sometime shoot up to 1200 - 1500 and then back down. It will then "hunt" around up and down for about 5 minutes until finally it finds the right spot. It will then idle perfectly until whatever time i add load to it or drive it somewhere and park again, which it then will do the same thing as before. If i wait 5 minutes or so it will idle perfectly again. I am thinking the IAC motor, but at 70 or 80 bux i want to make sure that is what i need. Anyone know of a way to check it? I was thinking of unplugging it while it was doing it to see what happens, but not sure if thats a good idea.
Okay so i just umplugged it and it idles perfectly no matter what i do the rpms are pretty stable. I read somewhere that this should shut the car down but it didnt. Kinda strange i think. I might just go buy a new iac after all. Any suggestions? Thanks!
Last edited by hardin800; 11-17-2012 at 10:58 AM.
Reason: tried unplugging it and doing the same thing.