Hurry, lots of us have suspected IAC issues! 
Interested in the outcome of this as well...... :o
another IAC question
Thread Starter
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
another IAC question
in a previous "POOR IDLE" thread, member '6speedshifty' said that if he disconnected his IAC while the car was running, the idle would run up to about 2000RPM, and then return to normal when plugged back in. Is this a valid method to determine if IAC is functionaing? On my '95, when I discconnect IAC, there is absolutely no change in idle? BTW, my idle drops from 700RPM to around 400RPM after about 30 minutes of driving. (LT1, 66K miles, 100% stock except for TB bypass)
any thoughts?
any thoughts?
Burning Brakes
Joined: Feb 1999
Posts: 1,157
Likes: 3
From: Encino CA
Originally Posted by MikeC4
in a previous "POOR IDLE" thread, member '6speedshifty' said that if he disconnected his IAC while the car was running, the idle would run up to about 2000RPM, and then return to normal when plugged back in. Is this a valid method to determine if IAC is functionaing? On my '95, when I discconnect IAC, there is absolutely no change in idle? BTW, my idle drops from 700RPM to around 400RPM after about 30 minutes of driving. (LT1, 66K miles, 100% stock except for TB bypass)
any thoughts?
any thoughts?
I have unsuccessfully been trying to solve an intermittent stumbling idle problem since last year. It is a 95 LT-1 automatic with about 55000 miles. When coming to a stop with car in gear, the engine would sometimes stumble almost like it was going to die (digital display would also dim as idle dropped). At normal driving speeds the car is excellent.
I first tried spraying some cleaner into throttle body and that seemed to eliminate the problem but then it came back. I then removed the IAC and cleaned the pintel but that didn't seem to help. So I replaced the IAC and that also did not seem to help. There are times when the stumbling idle does not happen at all and I think it's gone, but then it comes back again. The intermittent nature of this is really frustrating and there does not seem to be a pattern for when this will happen. Nobody on this forum had any real insights as to what causes this but there have been plenty of folks with similar problems. If you solve yours, let us know.
Thread Starter
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
Originally Posted by DougSilver
I have unsuccessfully been trying to solve an intermittent stumbling idle problem since last year. It is a 95 LT-1 automatic with about 55000 miles. When coming to a stop with car in gear, the engine would sometimes stumble almost like it was going to die (digital display would also dim as idle dropped). At normal driving speeds the car is excellent..etc
Burning Brakes
Joined: Aug 2001
Posts: 1,238
Likes: 0
From: walled lake MI
Mike, just posted in your "other" post...
by the way, i think the inside of beer cans are coated with something, dunno what problems that might cause.
i did the same by going to home depot and buying some sheet aluminum.
by the way, i think the inside of beer cans are coated with something, dunno what problems that might cause.
i did the same by going to home depot and buying some sheet aluminum.
Pro
Joined: Jan 2005
Posts: 686
Likes: 62
From: San Jose Ca
Originally Posted by MikeC4
in a previous "POOR IDLE" thread, member '6speedshifty' said that if he disconnected his IAC while the car was running, the idle would run up to about 2000RPM, and then return to normal when plugged back in. Is this a valid method to determine if IAC is functionaing? On my '95, when I discconnect IAC, there is absolutely no change in idle? BTW, my idle drops from 700RPM to around 400RPM after about 30 minutes of driving. (LT1, 66K miles, 100% stock except for TB bypass)
any thoughts?
any thoughts?
Burning Brakes
Joined: Feb 1999
Posts: 1,157
Likes: 3
From: Encino CA
Originally Posted by MikeC4
Doug, did u check out your EGR valve? If the valve is gunked up with carbon, it may not be shutting all the way when car is idleing(no exhaust should be allowed to enter intake during idle).
I did not check this myself but next time I have it in for any servicing I'll ask them to check the EGR.
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