TPI sensor problem
Thread Starter
Drifting
Joined: Mar 2013
Posts: 1,952
Likes: 239
From: Venice Cali.
TPI sensor problem
Hi there I've been driving around with code 22(off and on). After I finally cleaned up the connector again the light has been off but came on once a few days ago and went out again(code 22). Today nice 50 mile drive no light but my idle was up to 900 or so. So I tried to do idle set as in this forum and after I had to adjust up my throttle screw (to get 450 in neutral)I cannot get my tpi voltage under .79(need .54) even full twist low range. Did my tpi sensor finally give up the ghost? My car will not start now unless I adjust throttle up again. Unless I missed something? Should I start the idle setting process with the idle screw backed out all the way. I didn't see any step for that. Working on it tomorrow.
Last edited by xrav22; Sep 5, 2013 at 07:20 PM.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
You don't want to back out the idle screw all the way or the engine won't keep running when you start it.
Take off the air cleaner accordion coupler and look in the front of the throttle body to see how far the throttle blades are open. If the gap is really large then you know you have done something wrong. I don't have an obvious way to tell how large the gap should be. It's pretty small ("pretty" and "small" are relative and arbitrary... ;-).
Take off the air cleaner accordion coupler and look in the front of the throttle body to see how far the throttle blades are open. If the gap is really large then you know you have done something wrong. I don't have an obvious way to tell how large the gap should be. It's pretty small ("pretty" and "small" are relative and arbitrary... ;-).
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Looking at the time (1:45 AM), I decided not to do that tonight (this morning?).
Team Owner
Joined: Jul 2004
Posts: 28,427
Likes: 3,277
From: Hartford WI
Yes but the TPS isn't going to help with that if the min idle speed is wrong. The ECM will do what it takes to compensate. I would clean all the passages for the IAC and remove the IAC housing, clean that and reset the min idle instead of what you did.
Team Owner
Joined: Jul 2004
Posts: 28,427
Likes: 3,277
From: Hartford WI
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
Hi there I've been driving around with code 22(off and on). After I finally cleaned up the connector again the light has been off but came on once a few days ago and went out again(code 22). Today nice 50 mile drive no light but my idle was up to 900 or so. So I tried to do idle set as in this forum and after I had to adjust up my throttle screw (to get 450 in neutral)I cannot get my tpi voltage under .79(need .54) even full twist low range. Did my tpi sensor finally give up the ghost? My car will not start now unless I adjust throttle up again. Unless I missed something? Should I start the idle setting process with the idle screw backed out all the way. I didn't see any step for that. Working on it tomorrow.
I recently experienced the same issue. The code 22 was intermittent and was causing the engine to idle high. I replaced the TPS sensor and the problem was solved. If you replace it make sure to use an OEM sensor from AC Delco.
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Thread Starter
Drifting
Joined: Mar 2013
Posts: 1,952
Likes: 239
From: Venice Cali.
With the instructions jumper a/b, wait, set idle to 450 in drive ect. there is a thread somewhere I used but I found my air idle valve was very dirty and loose. That could not of been helping. Here it is
http://forums.corvetteforum.com/c4-t...dle-speed.html
http://forums.corvetteforum.com/c4-t...dle-speed.html
Last edited by xrav22; Sep 7, 2013 at 06:15 PM.
Team Owner
Joined: Jul 2004
Posts: 28,427
Likes: 3,277
From: Hartford WI
With the instructions jumper a/b, wait, set idle to 450 in drive ect. there is a thread somewhere I used but I found my air idle valve was very dirty and loose. That could not of been helping. Here it is
http://forums.corvetteforum.com/c4-t...dle-speed.html
http://forums.corvetteforum.com/c4-t...dle-speed.html