Sticking throttle body
Sticking throttle body I bought a stock throttle body bored to 52mm from TPIS earlier this year and want to give it some attention. It's been working fine except I can't adjust the tps voltage any lower than 0.78 or else it will stick. I believe with throttle closed it should be closer to 0.6v. Is there an easy way to fix this or do I have to take it to a machine shop? I emailed TPIS and this was their response: "I would suggest setting the throttle blades where your IAC counts are correct and then slot the mounting the holes of the TPS to get your correct voltage."
Not sure what that means...
Not sure what that means...
TECH Veteran
Joined: Apr 2008
Posts: 4,985
Likes: 112
click the link "how to adjust TPS"..
https://www.golenengineservice.com/i...-tech-articles
the response from TPIS is saying to also confirm your IAC counts are correct at idle by adjusting the stop screw accordingly on the TB. They want to be 32 (30-35) at idle with engine warmed up, no AC on. you need a scan tool to read IAC counts
Then you "slot" the TPS holes so you can then "clock" the TPS so it reads .67vdc with blades closed and 4.5 vdc full open
with that said I have a stock 48 bored to 52 and my TPS mounts in its stock position and blades never stick. It is not a TPIS TB. I did this about 18 years ago IIRC it is a David Kudos (not positive on last name) TB so don't know if he does it
BTW, you need the PCM tuned for the new larger TB so tranny failure will not happen. Line pressure adjustments per TB position need adjustment in tune
https://www.golenengineservice.com/i...-tech-articles
the response from TPIS is saying to also confirm your IAC counts are correct at idle by adjusting the stop screw accordingly on the TB. They want to be 32 (30-35) at idle with engine warmed up, no AC on. you need a scan tool to read IAC counts
Then you "slot" the TPS holes so you can then "clock" the TPS so it reads .67vdc with blades closed and 4.5 vdc full open
with that said I have a stock 48 bored to 52 and my TPS mounts in its stock position and blades never stick. It is not a TPIS TB. I did this about 18 years ago IIRC it is a David Kudos (not positive on last name) TB so don't know if he does it
BTW, you need the PCM tuned for the new larger TB so tranny failure will not happen. Line pressure adjustments per TB position need adjustment in tune
click the link "how to adjust TPS"..
https://www.golenengineservice.com/i...-tech-articles
the response from TPIS is saying to also confirm your IAC counts are correct at idle by adjusting the stop screw accordingly on the TB. They want to be 32 (30-35) at idle with engine warmed up, no AC on. you need a scan tool to read IAC counts
Then you "slot" the TPS holes so you can then "clock" the TPS so it reads .67vdc with blades closed and 4.5 vdc full open
with that said I have a stock 48 bored to 52 and my TPS mounts in its stock position and blades never stick. It is not a TPIS TB. I did this about 18 years ago IIRC it is a David Kudos (not positive on last name) TB so don't know if he does it
BTW, you need the PCM tuned for the new larger TB so tranny failure will not happen. Line pressure adjustments per TB position need adjustment in tune
https://www.golenengineservice.com/i...-tech-articles
the response from TPIS is saying to also confirm your IAC counts are correct at idle by adjusting the stop screw accordingly on the TB. They want to be 32 (30-35) at idle with engine warmed up, no AC on. you need a scan tool to read IAC counts
Then you "slot" the TPS holes so you can then "clock" the TPS so it reads .67vdc with blades closed and 4.5 vdc full open
with that said I have a stock 48 bored to 52 and my TPS mounts in its stock position and blades never stick. It is not a TPIS TB. I did this about 18 years ago IIRC it is a David Kudos (not positive on last name) TB so don't know if he does it
BTW, you need the PCM tuned for the new larger TB so tranny failure will not happen. Line pressure adjustments per TB position need adjustment in tune
