TPS Drama....
Thread Starter
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From: Maryville Tn
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TPS Drama....
My '85 has gone through 3 throttle position sensors in a little over a year and a half. Just got a call from DB Performance that the TPS is bad (and it was a AC Delco part) that I replaced not too long ago. What could be causing this? Anyone else have a similar experience out there? Any help would be appreciated. Trying to get her ready for the Cruise-In!
Le Mans Master
Joined: Feb 2006
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From: Louisiana
Originally Posted by mseven
Did it throw a code (21, 22) ? could be faulty connections, shorted sensor ground (dk. blue wire or gray), and or, ecm connection
either one of these could cause a TPS or any sensor to take a dump.
Thread Starter
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From: Maryville Tn
CI 5 thru 12 Veteran
St. Jude Donor '09 thru '23
NCM Sinkhole Donor
Originally Posted by mseven
Did it throw a code (21, 22) ? could be faulty connections, shorted sensor ground (dk. blue wire or gray), and or, ecm connection
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From: The Motor City
Originally Posted by H P Bushrod
Yes, before I took it in for it's engine mods, I got a code 22, with the new Delco TPS. Frustrating.
It will throw a 22 (low voltage)if the volts are less than .24. If that's set between .54 -.62. An open or short in the blue or grey wire will throw a 22.
I would begin with the weather pack connection, good clean connection etc. Get a VOHM meter it is easy to check. Disconnect sensor, jump the blue and gray wire should give over 4. volt. If not check blue wire for signal w/test light to battery power should show 4. volts. If yes, grey wire open or shoted to ground, connector or faulty ecm. If no, blue is shorted to sensor ground circuit (tps, cts, oil temp, all on same ecm ground, black wire) faulty ecm connection or ecm.
Originally Posted by Spankyellow
Could a worn out shaft in the TB be causing this ??
The TPS should be set static w/engine off (0% throttle angle), key on. If it were the shaft/bushing, I would suspect a higher v.reading (possibly code 21). Visual is still good, as kinkage, cable etc. may be held up or sticking at static position. Then being set to .54, and after car runs drops below.24 is possible.
Last edited by mseven; May 5, 2006 at 11:09 AM.
Le Mans Master
Joined: Feb 2006
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From: Louisiana
It makes it a little hard for me to believe that 3 TPS sensors would go bad with a properly working circiut or connections. Maybe..1 but 3... no. IMO I would check the connections TPS and ECM or circuit for being grounded, thus frying the TPS sensor.
Burning Brakes
Joined: Dec 1999
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From: Columbia MD
Originally Posted by H P Bushrod
My '85 has gone through 3 throttle position sensors in a little over a year and a half...
TPS Diagnostics
I hope this helps!
Thread Starter
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Joined: Jun 2002
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From: Maryville Tn
CI 5 thru 12 Veteran
St. Jude Donor '09 thru '23
NCM Sinkhole Donor
Originally Posted by LWesthaver
Here's a little bit of info I put together about a TPS problem I had:
TPS Diagnostics
I hope this helps!
TPS Diagnostics
I hope this helps!
