C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

86 TPS adj?

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Old Feb 24, 2018 | 01:12 PM
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Default 86 TPS adj?

I was going to replace the TPS on my 86 due to some idle problems but when I tried to adj it the lowest voltage I could get was about 3.45. the signal from the ecm is dead on at 5volts. I thought the tps should be at .5 volts with the throttle closed. What am I doing wrong or missing. Thanks for any help. Charlie M
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Old Feb 24, 2018 | 02:23 PM
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With the ignition key on, the TPS on an 86 should be .54.

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Old Feb 24, 2018 | 04:35 PM
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Default TPS adjustment

Originally Posted by billschroeder5842
With the ignition key on, the TPS on an 86 should be .54.

https://www.youtube.com/watch?v=O_oe5SEBv7s
I am only able to get mine down to 3.45 with the throttle closed. Could I be doing something wrong?
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Old Feb 24, 2018 | 06:50 PM
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Double check your settings on the OHM meter. If you are correct, then your TPS may be toast.
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Old Feb 27, 2018 | 01:48 PM
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Default Idle fixed Old age?

Got my idle problems fixed. Hate to admit it but I think old age and stupidity were a major factor. My auto range DVM would go to mili volts when it would get below about .75 volts I didn't catch it for a few tries. Thanks for the input.
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