Recently had a code for the check engine set off in my 1996 GMC Jimmy. turns out it came up as a low voltage on the TPS. changed the sensor and noticed that the truck was running better and the light was off. few days later the check engine light came back on. took the truck to the mechanic that inspects it and he said the code was low voltage on the TPS. he reset it and tested the TPS and said it was reading the proper voltage and if the light comes back on it would seem to be a wiring problem. the great news is he did not charge me. looked for the part on Rock auto but not exactly sure what the culprit could be. the only wire I could find was a throttle position sensor connector. seems like that this part may be needing replacement AcDelco Part # PT2319 . the part has a connector on one end but does the other end need to be hard wired in or does it have a connector . any other wires I should be looking at ?
check engine light still on ... what next ?
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I would check all the grounds from the Body to the battery, also check the engine computer ground. It could be setting the TPS code because of a poor ground but not necessarily be a TPS.
Out of all the GM's my dad (mechanic) has seen, they usually have bad ground contributing to the problem.
Out of all the GM's my dad (mechanic) has seen, they usually have bad ground contributing to the problem.
Originally Posted By: StevieC
I would check all the grounds from the Body to the battery, also check the engine computer ground. It could be setting the TPS code because of a poor ground but not necessarily be a TPS.
Out of all the GM's my dad (mechanic) has seen, they usually have bad ground contributing to the problem.
Sounds like a plan. guess that could be an easy fix if it turns out to be a bad ground.
I would check all the grounds from the Body to the battery, also check the engine computer ground. It could be setting the TPS code because of a poor ground but not necessarily be a TPS.
Out of all the GM's my dad (mechanic) has seen, they usually have bad ground contributing to the problem.
Sounds like a plan. guess that could be an easy fix if it turns out to be a bad ground.
Remove all the grounds, and clean them with some fine grit sand-paper and the spot it contacts, spray with some rust-inhibiting spray or di-electric grease and re-connect. Also check the main electrical wiring harness where it connects to the Fire-wall. Sometimes moisture gets into these connections and causes problems.
PM me for more information if you need I will be happy to keep relaying my dad's recommendations.
Cheers!
Steve
PM me for more information if you need I will be happy to keep relaying my dad's recommendations.
Cheers!
Steve
Originally Posted By: StevieC
Remove all the grounds, and clean them with some fine grit sand-paper and the spot it contacts, spray with some rust-inhibiting spray or di-electric grease and re-connect. Also check the main electrical wiring harness where it connects to the Fire-wall. Sometimes moisture gets into these connections and causes problems.
PM me for more information if you need I will be happy to keep relaying my dad's recommendations.
Cheers!
Steve
Was planning on removing them and cleaning everything up as you suggested. will let you know how it goes. hope the weather holds out on my days off this week so I can see what happens. like the idea of the di-electric grease. will post how it goes in a couple of days.
Remove all the grounds, and clean them with some fine grit sand-paper and the spot it contacts, spray with some rust-inhibiting spray or di-electric grease and re-connect. Also check the main electrical wiring harness where it connects to the Fire-wall. Sometimes moisture gets into these connections and causes problems.
PM me for more information if you need I will be happy to keep relaying my dad's recommendations.
Cheers!
Steve
Was planning on removing them and cleaning everything up as you suggested. will let you know how it goes. hope the weather holds out on my days off this week so I can see what happens. like the idea of the di-electric grease. will post how it goes in a couple of days.
A technical or Haynes manual will help you locate all the connections... Let me know
Gotta love those TPS sensors. And bad grounds. Seems like many GM's have this issue, not just your Jimmy.
Excellent advice StevieC. I possible fix that costs nothing but some of your time. I once owned a 1990 Subaru Legacy that had a bad shifting problem from 2nd to 3rd gear (automatic transmission). There were times the car would not even shift into 3rd, but go directly from 2nd to overdrive. On advice from a friend, I cleaned every ground connection I could find. After that, the car shifted silky smooth. I was amazed at the difference, and it only cost me a couple hours time.
I am all ready to dig in and get the ground wires all nice and clean. have to agree with the poster who said it is nice when you can fix an issue with more or less giving your ride some of your time.thanks for all of the advice and encouragement so far.
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