Idle is messed up again, please help
Thread Starter
Race Director
Joined: Jul 2000
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From: College of Charleston, SC
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Idle is messed up again, please help
Whenever I start the car cold, the idle sits around 1400 in park, and around 1000 in drive. The idle feels fine, but just a little high. However, after I drive a few minutes, the idle continually keeps falling. Eventually, I have to keep my foot on the gas at a stop light to keep it from stalling. Every once in a while, the car seems to burp. The idle dips down low, but shoots back up to the original position.
When all of this is happening, acceleration feels fine. If I am cruising and let off the gas, the revs stay up until I touch the brake. The revs fall fast whenever I touch the brake. Also, every once in a while, I hear a slight hissing noise from the pax side after I turn off the car, but only for about 10 seconds tops. There are no codes.
This is on a 91 L98 auto
When all of this is happening, acceleration feels fine. If I am cruising and let off the gas, the revs stay up until I touch the brake. The revs fall fast whenever I touch the brake. Also, every once in a while, I hear a slight hissing noise from the pax side after I turn off the car, but only for about 10 seconds tops. There are no codes.
This is on a 91 L98 auto
Burning Brakes
Joined: Apr 2002
Posts: 755
Likes: 0
From: Patterson CA
Re: Idle is messed up again, please help (vettes rule)
I have to investigate a rough/high idle this weekend myself, but now that you mention it I have noticed that "breathing" behind the crash pad as well. I have no idea what it is. I have my entire front dash off right now and can't tell what exactly is making the noise. :crazy:
Pro
Joined: Oct 2001
Posts: 725
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From: Berlin Maryland
Re: Idle is messed up again, please help (vettes rule)
It sounds like your tps sencer is not set up right. I had the same problem and after I got the set up parts from mid america vet . I set the tps up with my digital volt meater to .54 volt and it was a better. the Instructions comes with the sencer conections from mid america .the phone number is 1800 500 vett. plumberh2o :cheers:
Thread Starter
Race Director
Joined: Jul 2000
Posts: 15,921
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From: College of Charleston, SC
Cruise-In IV Veteran
Cruise-In V Veteran
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Re: Idle is messed up again, please help (plumberh2o)
I will check the TPS tomorrow, but I think I have it set right
