Causes of rough Idle.....
Thread Starter
Teching In
Joined: Dec 2007
Posts: 16
Likes: 0
From: North Platte, Nebraska
Causes of rough Idle..... All right guys, I have been having a problem with my car ever since i bought it. The cars runs and idles smooth when cool, but once warmed up, it idles a little rough and the RPMs fluxuate between 700-500. The motor sputters, but doesnt act like its gonna die, and when driving, under throttle it runs great. It tends to get worse when the car is at idle in reverse and drive. I checked the plug wires and they are all fine, and just replaced the plugs. I cleaned the MAF sensor, and added a new fuel filter. It was throwing a random missfire code before the plug change, but went away the day after. You guys have any suggestions??
TECH Fanatic
Joined: Aug 2006
Posts: 1,407
Likes: 63
From: Knappa, Oregon
Everybody says they checked the wires and they are fine. How did you check them? By looking at them for bad spots? You can't tell if wires are good by looking at them. They can have breaks inside that can't be seen. They aren't really made for putting on and off multiple times. The act of removing them is hard on them. I would advise changing them every other plug change.
I myself change the wires every time, but that's just me. Get a second opinion, but the wires are what I would do.
I myself change the wires every time, but that's just me. Get a second opinion, but the wires are what I would do.
ok that means the solinoid opened all the way letting in all the air it could get with the tb blade position! so was the rpm stable like that? also when i Ported my TB i noticed the iac solinoid was really dirty and full of carbon on it! you can try removing those two star screws holding it and clean it if that does not solve the problem im guessing your iac is gone!
Thread Starter
Teching In
Joined: Dec 2007
Posts: 16
Likes: 0
From: North Platte, Nebraska
Yeah, the RPMs were a steady 2000 when i unpluged it (IAC), so i turned the car off, plugged it back in, and started the car again, and it started sputtering/missfiring and the RPMs started to fluxuate between 400-700. So what would you make of that??
