Idle help...

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Mar 26, 2004 | 10:48 PM

djbraxton

Thread Starter

Instructor

Joined: Nov 2000

Posts: 171

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From: Huntsville, AL

Idle help...

Here is my delimma, finally got the vette to a stable idle, but now when I engage the A/C at idle, it stalls out. I have replaced the IAC and still have the problem.

Thanks,
Dj :flag

Mar 26, 2004 | 10:50 PM

65Z01

Team Owner

Joined: Dec 2000

Posts: 90,675

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From: SE NY

Cruise-In II Veteran

Re: Idle help... (djbraxton)

If it's the '88 you likely need to reset base idle and TPS base voltage; if it's the GS...sorry I can't help on that one.

Mar 26, 2004 | 10:58 PM

djbraxton

Thread Starter

Instructor

Joined: Nov 2000

Posts: 171

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From: Huntsville, AL

Re: Idle help... (65Z01)

65Z01,

Thanks, its the 88 vette, I have a buyer, but I'm trying to figure this out before I sell it to him. I set the TPS volts to 5.4 and timing to 8 degrees. I kinda at a lost. Idles fine but as soon as I engage the a/c it stalls....HELP

Thanks,
Dj :flag

[Modified by djbraxton, 9:59 PM 3/26/2004]

Mar 26, 2004 | 11:29 PM

Ramanstud

Melting Slicks

Joined: Oct 2002

Posts: 3,193

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From: Cincinnati Oh

Re: Idle help... (djbraxton)

well I hope that's a typo at 0.54 volts for the TPS, and you really ought to set the base timing at the factory 6 degrees- not only for emissions but to avoid any detonation issues for the new buyer. You may also want to disconnect the IAC, make sure the idle is where you want it to be by adjusting the throttle opening screw (on the drivers side of the throttle body?) and then reconnect the IAC plug. The computer should then bump up idle speed when the A/C comes on and problem solved. If it still stalls out- the computer may not "know" that you're turning the A/C on- hence a problem with the sensor or something (however that works).

Mar 26, 2004 | 11:39 PM

Sam Lam

Melting Slicks

Joined: Apr 2002

Posts: 2,118

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From: St. Charles, MO Route 66 Corvette Club

Re: Idle help... (djbraxton)

Djbraxton: I have set the base idle on my 89 a number of times and have the procedure written in a Word document. It is different from the one on the tech tips, mine is directly from the GM Helms manual. This procedure will take you about 1/2 hour. If you want a copy, send me a note to ar1943@charter.com.
SAM

Mar 27, 2004 | 04:48 AM

86PACER

Le Mans Master

Joined: Jan 2003

Posts: 5,858

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From: Santa Maria CA

Re: Idle help... (djbraxton)

Quote:

I set the TPS volts to 5.4 and timing to 8 degrees.

You mean .54 volts at closed throttle right? .54volts is real close to the factory spec.
5.4 volts is seriously off.

[Modified by 86PACER, 1:52 AM 3/27/2004]