TPS Failure 101
Thread Starter
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
TPS Failure 101
Some may have seen my plea for help with a poor idle problem and the insueing woes with not being able to get the 85 to run at all. After the &th Calvary came to the rescue I finally got around to finishing the basic tune to make the old girl driveable. Short version of another long story: Ran but wouldn't idle, 1100 min. Tried to force an idle by cranking out the adj screw ( needed to get the beast civilized so I could adjust idle correctly). No go and got code 21 TPS voltage high. Put my meter on the TPS and got a reading of 11.97 volts! Quick resistance checks confirmed the TPS was shorted. A new TPS did the trick. Idle is rock steady and the acceleration off idle is especially strong.
Lesson learned: THe simplest of parts going south can cause you serious grief,pain and dollars. I obviously never suspected a TPS and the obvious indicators did not point in that direction. Hopefully my unfortunate experience will help somebody with a similar problem.
Lesson learned: THe simplest of parts going south can cause you serious grief,pain and dollars. I obviously never suspected a TPS and the obvious indicators did not point in that direction. Hopefully my unfortunate experience will help somebody with a similar problem.
Safety Car
Joined: Sep 2003
Posts: 3,598
Likes: 23
From: Orange County NY
St. Jude Donor '10-'11-'12-'13
Originally Posted by hippy
Isn't the supply voltage to the TPS 5.0v?
Thread Starter
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
Brain Fart 101. Make that 4.97 volts. Sorry guys. We had the house recarpeted today and my butt is dragging from moving stuff. I tried to make that post between trips to sort things out for the installers.
Now it makes sense 
