Horrible Idle Problem
Thread Starter
On The Tree
Joined: Nov 2004
Posts: 198
Likes: 0
From: Ponder Texas
Horrible Idle Problem When I put my car in neutral the rpms jump up to about 3 or 3-1/2k if I have the a/c on it jumps up to over 4k. I had to right my breaks just to get it home. I thought surely it was the iac because it was covered in crud, but I changed it out and nothing has changed. The car is pretty much stock. 100k miles, poly motor mounts, K & N, Cut-out. The only ideas I have are, I de-screened the MAF about 6-8 months ago, and I threw a p1416 code. The ses light went of so I never bought the air valve. Any ideas?
TPS - Throttle Position Sensor.
Sorry just looked it up and it is the IAC sensor. Try this, it wouldn't hurt.
Depress accelerator slightly
Start engine, then release accelerator pedal, run engine for 5 seconds
Turn ignition "OFF" for ten seconds
Restart engine and check for proper idle operation
It is NOT recommended to to push or pull on the pintle of an IAC that has been in service. The force required can damage the threads on the worm drive. Also, do not soak the IAC in any liquid cleaner or solvent, as damage may result. When installing a new IAC, you may move the pintle to match the measurement of the old one. The force required to move a NEW valve will not cause damage to it. Use engine oil to lubricate the o-ring. Tighten attaching screws to 27 lb. in.
Note that the 1993 IAC has a square electrical connector and the valve screws into the throttle body, instead of being held on by screws like those of later years.
Sidenote: When you cleaned the TB, did you clean the idle hole good?
Sorry just looked it up and it is the IAC sensor. Try this, it wouldn't hurt.
Depress accelerator slightly
Start engine, then release accelerator pedal, run engine for 5 seconds
Turn ignition "OFF" for ten seconds
Restart engine and check for proper idle operation
It is NOT recommended to to push or pull on the pintle of an IAC that has been in service. The force required can damage the threads on the worm drive. Also, do not soak the IAC in any liquid cleaner or solvent, as damage may result. When installing a new IAC, you may move the pintle to match the measurement of the old one. The force required to move a NEW valve will not cause damage to it. Use engine oil to lubricate the o-ring. Tighten attaching screws to 27 lb. in.
Note that the 1993 IAC has a square electrical connector and the valve screws into the throttle body, instead of being held on by screws like those of later years.
Sidenote: When you cleaned the TB, did you clean the idle hole good?
Thread Starter
On The Tree
Joined: Nov 2004
Posts: 198
Likes: 0
From: Ponder Texas
Upon some advice from my brother-in-law, I pulled off the lid and maf and held a piece af cardboard to the throttle body. The engine did not die, and I could hear the vacuum leak. Problem solved. Thanks guys!
