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1993 GMC Suburban TPS

Tiny
TLGEIRNA
  • MEMBER
  • 1993 GMC SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 220,300 MILES
Guys, I had a code 22 flash when I checked the on board computer system thru the service engine soon light. I went ahead and replaced the throttle position sensor and thought that would cure my problem. As it turns out just a few days later the same code has appeared again. What else can I check to remedy the situation? It seems when the service engine light is on my performance as the truck shifts thru gears is very rough. But it does not come on everytime I start the truck and when it does not come on the truck seems to run just fine. It must have some type of default code built in if something in this area fails to preform properly.
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Saturday, February 27th, 2010 AT 11:36 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
The SES light should come on everytime the ign. Is in the "on" position and go off after engine is started.

Could be a loose bulb connection in the SES light itself, or this coild be an intermittent problem.

The TPS (failure) will cause the ECM to set a default rich mixture, causing the rough idle you describe.

I would take to trusted garage or dealer and have ECM scanned with OBDI scanner in live data mode. Check TPS voltage signal. Should be <1V at idle and between 4.2 and 4.5 at WOT.
You may have gotten a bad TPS or the wiring to it is faulty, or the ECM may be the problem.
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Sunday, February 28th, 2010 AT 9:06 AM
Tiny
TLGEIRNA
  • MEMBER
  • 3 POSTS
Thanks for the info I will look into it.
My guess is that it is an itermittant problem. If the SSE light does not come on and stay on after start up the truck functions as normal. But on the occasion that the SSE light comes on and stays on it runs rich and sets the default code. It has only happened once since I have changed the TPS last thusday night.
Is it OK to take truck to a locally owned auto parts store and have them run a check on the EMC/TPS with their OBDI scanner or will this not give me enough information? Thanks T-
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Monday, March 1st, 2010 AT 2:43 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Most local parts stores can only scan OBDII, but if they can scan OBDI, then have them do it.
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Tuesday, March 2nd, 2010 AT 8:56 AM

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