L98 TPS Voltage range

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Jul 26, 2022 | 03:09 PM

Speedy Saguaro

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L98 TPS Voltage range

In doing a lot of reading trying to fix my poor throttle response (87 vette auto trans), I finally got a multimeter and tested the TPS. The idle volt on it was at .44 and increased almost spastically when going toward WOT.

I ended up just replacing the TPS and when at WOT its coming in at 4.24. Shouldn’t it be closer to 5 at WOT? Or is that not a bog deal?

Im not crazy knowledgeable on how it works, but I feel the .55 idle volt to 4.24 WOT is slightly restricted range.

Thanks

Jul 26, 2022 | 06:12 PM

84 4+3

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4.24 doesn't seem that far off. You should be able to probe the reference wire too and see what it reads by comparison. They should be close in reading.

Jul 27, 2022 | 12:18 PM

Mrvettenick

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I believe when the ECM sees over 4 volts, it goes into fuel enrichment mode.

Jul 27, 2022 | 01:59 PM

Speedy Saguaro

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Quote:

Originally Posted by Mrvettenick

I believe when the ECM sees over 4 volts, it goes into fuel enrichment mode.

what happens in fuel enrichment mode? I haven’t heard of this

Jul 27, 2022 | 02:15 PM

Mrvettenick

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The ECM recognizes that you're on it and adds additional fuel and spark timing to compensate for the load.

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