Engine SwapEverything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.
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Ok, I am chasing down the few gremlins left, my tach doesn't work. I have the correct wire spliced into the LT1 harness but no tach. Oil, volts, and temp works.
Also, is there a way to measure the tach signal while the car is running to make sure that the PCM is putting out a signal?
best way would be to get an electronics buddy with an oscilloscope to see the signal (if any).
if you dont have that --- A cheap $10 voltmeter should tell you if a voltage is there or not if youre just looking to find out if the signal is reaching the tach.
other ideas:double check all your tach connections. make sure no wires cut. if you think your tach is bad - hook it up in another car or if you have a spare tach - hook that up and find out.
more than likely there is a bad connection or cut wire somewhere
It could also be a bad sensor connection or bad sensor. I cant remember specifically which sensor picks up the tach signal. its probably the one that connects to the optispark.
