1988 R20 TBI High Idle?

[chris989]

Originally Posted by R30 Casey

I know this thread was started in 2017, Checking to see what the results were or if you solved the issue, I am having the same exact issues on my 88 R30, I am wondering what you did to resolve / fix your high idle issue. Any input from the user would be appreciated.

Casey,
I know this is old and your post is a month ago,,,

Anywhoo,,, I chased a random high issue in my 5.7 tbi forever. I can data log and everything was alway in spec and then while driving it would idle crazy high until i turned the key off and restarted.

It turned out to be a defective TPS sensor. In the garage,, testing voltage it was always good. Even driving it would data log good. I finally caught it one day at a redlight. The TPS value spiked/jumped around and then went back to normal but when it failed for that few seconds it jacked up the computer without throughing a code.

Anyway, new TPS,, no more problem... I plagued me for years.

Need more help just ask,,, I will reply,

Chris