Adjusting the Throttle Position Sensor (CFI)
Thread Starter
Burning Brakes
Joined: Aug 2008
Posts: 893
Likes: 226
From: Tampa, FL
Adjusting the Throttle Position Sensor (CFI)
Hey guys, my daughter took information from several locations, factory service manual for the 84 Corvette, as well as the 85 and 86 Fiero Iron Duke service manual (they use the same TBI, essentially, and the same TPS). She put together a video that should help clear up some issues with adjusting the TPS. There are a lot of videos already out there, but she tried to incorporate everything she could.
Bottom line, a 0.575 volts is less important, as the effective range of the TPS. It should surprise no one that an original US made AC DELCO TPS ended up faring better than literally all of the brand new aftermarket ones. Some of them were horrible. It seems the ECM uses it more as a reference point, so the greater the range, the better the ECM handles minute changes.
Hope this helps someone... (again, only really applies to the Cross Fire Injection Corvette, unless someone wants to swap an Iron Duke into their Corvette, which would be pretty funny)
Bottom line, a 0.575 volts is less important, as the effective range of the TPS. It should surprise no one that an original US made AC DELCO TPS ended up faring better than literally all of the brand new aftermarket ones. Some of them were horrible. It seems the ECM uses it more as a reference point, so the greater the range, the better the ECM handles minute changes.
Hope this helps someone... (again, only really applies to the Cross Fire Injection Corvette, unless someone wants to swap an Iron Duke into their Corvette, which would be pretty funny)
Racer
Joined: Mar 2025
Posts: 493
Likes: 242
I don't have a Crossfire (thankfully) but this is a great video and this is how DIY videos should be done. Many people who make such videos who are very knowledgeable assume knowledge of their viewers and leave out critical information and steps. Lighting and info was good.
I would only have mentioned that back probing the sensors is possible if one doesn't have or cant source the harness. In the later TPS's the mounting holes were expanded to allow movement of the TPS without filing, I didn't know that about the earlier sensors.
I would only have mentioned that back probing the sensors is possible if one doesn't have or cant source the harness. In the later TPS's the mounting holes were expanded to allow movement of the TPS without filing, I didn't know that about the earlier sensors.
