Fluctuating start-up idle
Thread Starter
Advanced
Joined: May 2001
Posts: 57
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From: Yokosuka
Fluctuating start-up idle
89 vette. Idle on start up is steady until 110F and them surges from 700-1100 rpm. Surge will decrease at 120f (500-900) and the around 140F will be steady at 600 rpm. If you throw the car into drive idle will automatically steady out at 500-600 rpm. All sensors have been replaced in the past two months including computer and control devices. Fuel pump,filter and regulator has been changed and ERG system is new. Thoughts? : :smash:
Intermediate
Joined: Oct 2001
Posts: 28
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From: North Branch Mn
Re: Fluctuating start-up idle (Shonan)
I don't know if the 89 is the same as the 85, but I cleaned my TB and replaced the TPS and IAC and followed the instructions in the tech tips section. It was easy to do. Did you already replace this stuff?
Team Owner
Joined: Apr 2000
Posts: 27,818
Likes: 8
From: CT
Re: Fluctuating start-up idle (Jason - 85)
Pop a fuel pressure gauge on there. Watch what it does. If it's overly rich...it'll cause a fluctuation(So I've heard). Be sure the regulator isn't going bad as well. Good luck.
