TPS Adjustment
Thread Starter
Le Mans Master
Joined: May 2003
Posts: 8,175
Likes: 237
From: Philadelphia Burbs
Cruise-In V Veteran
St. Jude Donor '06
TPS Adjustment
How many folks have done the TPS adjustment detailed at:
https://www.corvetteforum.com/techti...D=55&TopicID=2
Opinions? Any things I need to be aware of? Looking for any and all thoughts...
https://www.corvetteforum.com/techti...D=55&TopicID=2
Opinions? Any things I need to be aware of? Looking for any and all thoughts...
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
That seems like a pretty through and accurate write up except that he didn't mention to also rotate the TPS about the bottom screw to get max WOT voltage.
Also, I like to set the base idle TPS value to .65 Vdc to maximize throttle response. A value above about .67 Vdc will set off a TPS code.
My method is detailed on my site.
Also, I like to set the base idle TPS value to .65 Vdc to maximize throttle response. A value above about .67 Vdc will set off a TPS code.
My method is detailed on my site.
Thread Starter
Le Mans Master
Joined: May 2003
Posts: 8,175
Likes: 237
From: Philadelphia Burbs
Cruise-In V Veteran
St. Jude Donor '06
Re: TPS Adjustment
Update:
I tried this last night, but never got to a point where the engine wouldn't die after disconnecting the IAC - in other words it wouldn't maintain any idle speed. I saw the note about getting the engine up to "operating temperatures" - is there some specific point where a cut-over to these temperatures happens? Is it the oil temperature or the coolant temperature or both?
I tried this last night, but never got to a point where the engine wouldn't die after disconnecting the IAC - in other words it wouldn't maintain any idle speed. I saw the note about getting the engine up to "operating temperatures" - is there some specific point where a cut-over to these temperatures happens? Is it the oil temperature or the coolant temperature or both?
Le Mans Master
Joined: Feb 2000
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From: Kempner Texas
Originally Posted by j3studio
Update:
I tried this last night, but never got to a point where the engine wouldn't die after disconnecting the IAC - in other words it wouldn't maintain any idle speed. I saw the note about getting the engine up to "operating temperatures" - is there some specific point where a cut-over to these temperatures happens? Is it the oil temperature or the coolant temperature or both?
I tried this last night, but never got to a point where the engine wouldn't die after disconnecting the IAC - in other words it wouldn't maintain any idle speed. I saw the note about getting the engine up to "operating temperatures" - is there some specific point where a cut-over to these temperatures happens? Is it the oil temperature or the coolant temperature or both?
At that point if the engine still dies when the IAC is disconnected, then you need to raise the minimum airflow by adjusting the torx head screw in the throttle body - driver's side near where the cables connect to the TB.
Jake
Thread Starter
Le Mans Master
Joined: May 2003
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From: Philadelphia Burbs
Cruise-In V Veteran
St. Jude Donor '06
Originally Posted by JAKE
Let the engine idle long enough to go closed loop. This will probably take five minutes or so.
At that point if the engine still dies when the IAC is disconnected, then you need to raise the minimum airflow by adjusting the torx head screw in the throttle body - driver's side near where the cables connect to the TB.
At that point if the engine still dies when the IAC is disconnected, then you need to raise the minimum airflow by adjusting the torx head screw in the throttle body - driver's side near where the cables connect to the TB.
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Le Mans Master
Joined: Feb 2000
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From: Kempner Texas
Originally Posted by j3studio
Thanks, Jake!
Doing it that way will sometimes allow the engine to continue to idle on its own.
But if that fails, then the min air screw adjustment is called for.
Jake
Team Owner
Joined: Dec 2000
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From: SE NY
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It can be difficult to get it to idle down to 450 RPM.
I found that backing the set screw off from about 600 RPM worked long enough to get a solid RPM reading.
Then if the engine dies just remove the IAC connector and you are good to set up the TPS.
Thread Starter
Le Mans Master
Joined: May 2003
Posts: 8,175
Likes: 237
From: Philadelphia Burbs
Cruise-In V Veteran
St. Jude Donor '06
Re: TPS Adjustment
Thanks to everybody who is contributing to this thread - you are steadily increasing my chances of getting a useful result!
Thread Starter
Le Mans Master
Joined: May 2003
Posts: 8,175
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From: Philadelphia Burbs
Cruise-In V Veteran
St. Jude Donor '06
Re: TPS Adjustment
Once again defeated update:
I am discovering that I don't have nearly enough of the (right) tools. Does anybody know what size wrench you need to get the IAC out and clean it as 65Z01 suggests?
I am discovering that I don't have nearly enough of the (right) tools. Does anybody know what size wrench you need to get the IAC out and clean it as 65Z01 suggests?
Team Owner
Joined: Jul 2004
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From: Hartford WI
Originally Posted by j3studio
Once again defeated update:
I am discovering that I don't have nearly enough of the (right) tools. Does anybody know what size wrench you need to get the IAC out and clean it as 65Z01 suggests?
I am discovering that I don't have nearly enough of the (right) tools. Does anybody know what size wrench you need to get the IAC out and clean it as 65Z01 suggests?
