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Idle is high what do I look at

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Old May 29, 2003 | 11:50 PM
  #1  
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From: Glasgow Kentucky
Car: 04 Vette
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Idle is high what do I look at

I purchase an 85 tpi car yesterday and it had all kinds of vacuum leaks when I got it home which I fixed but the idle is still way high like 1500 rpm I ran the trouble codes and got a 22 which is the tps could this be my problem?

Last edited by biff85ta; May 30, 2003 at 12:15 AM.
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Old May 30, 2003 | 08:57 AM
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From: Texas
Car: 1992 Formula Firebird
Engine: 305CID (LB9)
Transmission: World Class T5
Axle/Gears: 10-bolt, 4.10 gears
Yes your TPS can most definatley be your problem. But it is not just a replacement part. You have to replace it, then set it correctly.

To do this you need two wires and a voltmeter. I prefer digitial for this but I suppose analog could do in a pinch. There is a proceedure on this here https://www.thirdgen.org/newdesign/tech/tpimod2.shtml

Hope this helps.
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Old May 30, 2003 | 10:00 AM
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From: INDY
Car: 85-Vette
Engine: 406ci
Transmission: TKO-600
Axle/Gears: 3:45
Re: Idle is high what do I look at

Originally posted by biff85ta
I purchase an 85 tpi car yesterday and it had all kinds of vacuum leaks when I got it home which I fixed but the idle is still way high like 1500 rpm I ran the trouble codes and got a 22 which is the tps could this be my problem?
Did you set the Idle Air Control and the Throttle Position Sensor voltage?
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Old May 30, 2003 | 03:02 PM
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biff85ta's Avatar
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From: Glasgow Kentucky
Car: 04 Vette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
Noy yet but they will be first on my list as I am trying to get one ready to sell and the other ready to drive plus work I have more to do than time.
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Old May 31, 2003 | 09:55 PM
  #5  
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From: Glasgow Kentucky
Car: 04 Vette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
I have set the iac but the tps is shot so off to the parts store in the morning I go no matter how I adjusted the tps the most I got was .3 something so it must be shot.
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Old May 31, 2003 | 10:32 PM
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From: CLIMAX, GA. USA
Car: 1972 LT1 Corvette
Engine: 350 HO
Transmission: M22 Heavy Duty 4 Spd
Axle/Gears: 336
Are you sure you were on the center wire in the plug. At .3 volts the engine should not even run, surely not at 1500 RPM's
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Old Jun 1, 2003 | 12:40 AM
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From: Glasgow Kentucky
Car: 04 Vette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
Yeah I was on the center terminal I could run it up and down and vary the readings ti just would not adjust far enough to set at .54 going to buy a new one in the morning and probably a new IAC as I believe it must be bad as well.
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Old Jun 1, 2003 | 12:26 PM
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From: CLIMAX, GA. USA
Car: 1972 LT1 Corvette
Engine: 350 HO
Transmission: M22 Heavy Duty 4 Spd
Axle/Gears: 336
First check that the gray wire on the TPS plug has 5 volts with the ignition on and the blk wire is at ground (0 volts) the center (signal wire) should have a blue tracer.
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Old Jun 1, 2003 | 04:03 PM
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From: Glasgow Kentucky
Car: 04 Vette
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Axle/Gears: 2.73
It was the tps changed now its all good.
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