Idle issue re-visited.
Thread Starter
Drifting
Joined: May 2003
Posts: 1,979
Likes: 48
From: Lakeport CA
Idle issue re-visited.
Okay I've replaced just about everything now & still have the same issue.
Idle varies between 900 & 1200 RPM when the car is rolling but on occasion when first starting up. Always seems to settle down a minute at most after start up.
When rolling, forward or reverse, a few seconds after the the car comes to a complete stop the idle drops to 800 & stays put.
Example would be rolling up to a stop sign, put the clutch in & the idle does its little game as I'm rolling up. After I stop it might do it one or two more times then settles down.
I've replaced the IAC & the IAC/coolant housing on the bottom of the throttle body. While I had the TB off for that I completely cleaned up all the deposits in both the front/back/top/bottom of the TB & IAC passages. It was "spotless" when I put it back together. No change in the issue.
Same issue with both the stock chip & an after market that I'm now running.
I have the coolant bypassed by the way. Since I bought the new IAC house I even cut the stupid fittings off flush so they don't stick out. If for some crazy reason I need it back I'll have to put the old housing back on.
Does anyone have any ideas?
Idle varies between 900 & 1200 RPM when the car is rolling but on occasion when first starting up. Always seems to settle down a minute at most after start up.
When rolling, forward or reverse, a few seconds after the the car comes to a complete stop the idle drops to 800 & stays put.
Example would be rolling up to a stop sign, put the clutch in & the idle does its little game as I'm rolling up. After I stop it might do it one or two more times then settles down.
I've replaced the IAC & the IAC/coolant housing on the bottom of the throttle body. While I had the TB off for that I completely cleaned up all the deposits in both the front/back/top/bottom of the TB & IAC passages. It was "spotless" when I put it back together. No change in the issue.
Same issue with both the stock chip & an after market that I'm now running.
I have the coolant bypassed by the way. Since I bought the new IAC house I even cut the stupid fittings off flush so they don't stick out. If for some crazy reason I need it back I'll have to put the old housing back on.
Does anyone have any ideas?
Instructor
Joined: May 2004
Posts: 163
Likes: 0
From: machesney park il
the shafts on the throttle body could be wore and leaking vacumn thru them causing the idle problem. the factory just puts the shafts in with a rubber o ring seal that wears out after a while,then the shaft bores get elongnated.
Drifting
Joined: Aug 2004
Posts: 1,400
Likes: 0
From: Oceansaide CA
What he said, GM TB doesnt have bearings, so the TB wears over time and the holes go oval; then the blades get stuck in part-open position, hence "wild idle syndrome"
I have it too, just don't care atm.
e-mail dkoldos@ameritech.net, he sells rebuilt TBs on e-bay, with bearings installed, and a slew of other mods, good stuff apperantly.
I have it too, just don't care atm.
e-mail dkoldos@ameritech.net, he sells rebuilt TBs on e-bay, with bearings installed, and a slew of other mods, good stuff apperantly.
Burning Brakes
Joined: Jun 2003
Posts: 1,229
Likes: 1
I seem to also be having the same problem, I'm 90% certain its because of the TB as well. I tested the TPS voltage a few months ago and it was fine, but I didn't test the AIC. My symptoms are very much the same, sometimes it will stay stuck between 900 to 1200 rpm when at a stop sign, but it I tap the gas pedal slightly it will go back to down 700rmp.
I also don't' really care at the moment....
I also don't' really care at the moment....
