IAC going bad??
Thread Starter
Joined: Nov 2012
Posts: 339
Likes: 0
From: Auburn Alabama
IAC going bad?? I recently had the motor out of my 88 Mustang 5.3 swap and after putting it back in the idle was surging so bad that it would stall. I did an IAC and TPS reset and it seemed to idle just fine for about a day then it started slightly surging at idle again. I once again did the reset and it was fine. Could my IAC be going bad? Suggestions?
could be the tps sensor. Seen them do a lot of crazy things when failing like that. the iac is basically a stepper motor so its kind of a work or dont work thing the fact that it works sometimes to me sounds like the iac isnt stuck or carbon'd up.
if you have a scanner try and watch both sensors at idle to see what they do. the tps sensor can cause erratic readings when failing which in turn will make the iac try to compensate thus causing the erratic idle. resetting the tps will 0 it out so that could be whats going on
if you have a scanner try and watch both sensors at idle to see what they do. the tps sensor can cause erratic readings when failing which in turn will make the iac try to compensate thus causing the erratic idle. resetting the tps will 0 it out so that could be whats going on
Thread Starter
Joined: Nov 2012
Posts: 339
Likes: 0
From: Auburn Alabama
I hooked my scanner up last night but didn't see any variation in throttle position. I'll pull it up on EFI Live next chance I get to see what the voltage readings are.
