Tach problems
#6
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Yes it does. There is another tach output lead on the engine. Its a grey wire that will have a plug in it. You can try to hook it to the wire coming from the ecm. You could also use that wire and run a temporary wire to the dash to see if it reads correctly and narrow down the problem. If the scan tool reads correctly, then the issue is not the tach driver in the Mefi and that is where the signal for the tach comes from. Must be a wire issue.
Eddie
Eddie
#7
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the other grey tach wire is by the engine diagnostic plug. at 800 rpm idle the LH tach reads 1700, the RH tach reads 1500. I will run a wire from the spare tach wire on the engine to the tach