LT1 TPS zero voltage
Thread Starter
Racer
Joined: Nov 2010
Posts: 413
Likes: 2
From: Carencro LA
LT1 TPS zero voltage
My 93 Lt1 has never idled right has a high idle. it is setting a SES for low voltage on TPS, I put a meter on it, it's 0 volts, has the 5 volts going to the TPS, swapped the TPS with a used one, get same thing, bought new TPS cant get it installed, the throttle shaft has to be turned to full throttle to get the TPS on, then throttle wont close
Racer
Joined: Sep 2011
Posts: 400
Likes: 5
From: Bakersfield Ca
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
There is no minimum idle adjustment procedure for LT1s. That only applies to L98s.
Usually a high idle is caused by a vacuum leak. I suggest looking at the vacuum check valve under the passenger side fuel rail cover.
Usually a high idle is caused by a vacuum leak. I suggest looking at the vacuum check valve under the passenger side fuel rail cover.
Last edited by Cliff Harris; Oct 25, 2014 at 03:20 AM.
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Right. I must have skipped over the part where he said LT1. My bad.
Race Director
Joined: Feb 2002
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From: Compound in the Grove, Ga.
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St. Jude Donor '16
Just a shot in the dark other than a vac leak Have you checked the IAC? It may need to be cleaned or replaced.
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