Is Vader86's C4 Technical Page, how to set the idle for L98, Same for 1985??
I need to reset the idle on my 1985 L98, I saw Vader86's C4 Technical Page website (WOW!! THANKS FOR ALL THE GREAT INFO Vader86!!) On his website he has how to reset the idle on a 1989 L98. Is that the same procedure that I would use on my 1985 L98??
SORRY people, new vette owner here, I will be asking alot of questions THANKS FOR ANY INFO |
Originally Posted by Bobwhite85
On his website he has how to reset the idle on a 1989 L98. Is that the same procedure that I would use on my 1985 L98??
You can learn a lot about how different systems of your car operate and interact with one another, besides saving you a bundle in misdiagnoses by picking up a FSM Factory Service Manual. RACE ON!!! |
This is basically a TPS/IAC resetting, so that the ECM controls it properly. You may also look at the other one, on cleaning and resetting the TPS/IAC. There are 2 pages, one written by Sam Lam.
I dont see why it wouldnt work for 85. |
Originally Posted by vader86
(Post 1561709617)
This is basically a TPS/IAC resetting, so that the ECM controls it properly. You may also look at the other one, on cleaning and resetting the TPS/IAC. There are 2 pages, one written by Sam Lam.
I dont see why it wouldnt work for 85. |
Originally Posted by Bobwhite85
my idle went up to 1200rpms so I turned it down via the little torx screw on the TB. After reading your site I see that was wrong. So I was just going to start from scratch and reset it.
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Originally Posted by CFI-EFI
(Post 1561712174)
It as MORE wrong that you COULD change the idle speed with that screw. That is a definite sign that someone that doesn't know what they were doing has been playing in there before you get the car. With the minimum air adjustment properly set, the IAC should pretty much maintain the prom idle speed. Do follow the minimum air, IAC and TPS adjustments procedures from vader, or better yet your own FSM.
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Originally Posted by Bobwhite85
(Post 1561709692)
Ok, Thank you!! I just got the car did a tune up and fixed about three vacuum leaks and my idle went up to 1200rpms so I turned it down via the little torx screw on the TB. After reading your site I see that was wrong. So I was just going to start from scratch and reset it. That is a very uesfull website you have there THANKS!!
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Originally Posted by _twisted_
A sure way to tell is if the cap covering the min idle screw is gone :flag:
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Originally Posted by CFI-EFI
(Post 1561712556)
The cap missing is a sure sign of the screw having been accessed before, but the proof that it has been messed with by someone that doesn't know what they were doing, comes from being able to lower the idle speed from 1200 rpms, with the throttle stop screw.:thumbs:
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Originally Posted by pcolt94
(Post 1561713454)
So then what would be the criteria for setting (or re-setting) up the throttle stop screw. Is there a TPS on that year car which you would set up a specific voltage for minimum throttle stop point?
If you have a 94, I dont think your TPS is adjustable from the factory |
Originally Posted by _twisted_
(Post 1561712226)
A sure way to tell is if the cap covering the min idle screw is gone :flag:
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Originally Posted by _twisted_
(Post 1561713701)
If you have a 94, I dont think your TPS is adjustable from the factory
Thanks, I was just asking for general knowledge on that 85, not my 94. :flag: |
Yes, the 85 is set with the same procedure as on Vader's web page. Anytime the idle screw on the TB is turned, it will also change the voltage reading at the TPS. Follow the procedure and the idle should come down as long as there is not other problems.
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Originally Posted by pcolt94
So then what would be the criteria for setting (or re-setting) up the throttle stop screw.
Originally Posted by pcolt94
Is there a TPS on that year car which you would set up a specific voltage for minimum throttle stop point?
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