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Registered
94 Pickup; 03 GTi
Joined
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55 Posts
Discussion Starter #1 (Edited)
Hi folks,

I have an autozone RPM gauge. It gets signal from the diagnostic port next to the fuse box for several years. It's a 22RE manual with 119k mi.

Recently the RPM needle jumps erratically over the RPM range. Mostly happens at 1st cold start of the day or sometimes during the day even after warmed up. Could this be a electrical only issue? For example, I am positive the engine is not running at 4k ~ 5k RPM at 60MPH with 5th gear...because engine still sounds running at ~2.5k.

Where should I diagnose first?
 

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Cressida nut
91 Pickup (Hilux)2wd
Joined
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4,586 Posts
could be the high quality autozone gauge too. not that I should talk mine still works 3 cars and 7 years later.
 

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YOTA Master
'93 2wd P/U
Joined
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2,434 Posts
Check the wiring to the gauge. The tach signal at the diagnostic connector is tied to the negative side of the coil, and if there were something wrong with the signal, then you would likely have a driveabilty issue and/or a check engine light.

check the power and ground supplies as well as the tach signal wiring.

Hope this helps
 
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