no rpm signal
While cranking I have no rpm signal, I have dual throttle body set up, it was running fine and all of a sudden it stop starting, key on the pump primes and you here it squirt but no start, the controller stays on, just no signal. What can I check to diagnose the problem, need help with this, dont have time to wait 30 to 45 minutes on hold for fitech support.
Quote from duckman1963 on November 30, 2021, 9:02 pmWhile cranking I have no rpm signal, I have dual throttle body set up, it was running fine and all of a sudden it stop starting, key on the pump primes and you here it squirt but no start, the controller stays on, just no signal. What can I check to diagnose the problem, need help with this, dont have time to wait 30 to 45 minutes on hold for fitech support.
Need more info. Are you using timing control or just tach signal?
Tach signal
Are you taking the tach signal from the coil or HEI distributor? Are you getting spark? While cranking are you looking inside the bores of the throttle body to see fuel is being pumped. Have you checked to see if there is voltage on the white wire while cranking and if yes, what is the voltage while cranking? Are there any error codes on the handheld? There should be if there is no RPM signal. Lastly you may try shielding the blue tach wire and ground the shield. Or make sure blue tach wire is not close to any spark plug wires. As a worst case scenario, it maybe your ECU. There seems to be alot of ECU's failing.