Quote:
Originally Posted by 87m491
A buddy and I rebuilt an 84 3.2 this winter that he bought as a basket case with hacked electronics throughout the car. That said, car drove off the truck and into the garage.
He's successfully done 996 and 997 engines after taking Raby's course but says the 3.2 is more of a PITA.
Finally have engine back in and trying to fire. Car barely coughed. It coughs at first attempt the nothing. Let it sit, a small cough at first revolutions, then nothing. We have spark, we have fuel pressure at the rail, but injectors are not pulsing as evidenced by dry plugs and no gas smell. (I don't think my DVM is sensitive enough to measure pulses) I swapped in my 87 ECU and the car coughs more, it seems close, but #6 plug still dry.
Both CPS and CHT Ohm OK
Swapped in known good DME rely, no difference
ISV is humming
12V to injectors at connectors
Injectors Rebuilt and tested before reinstalled.
Cap, rotor, wires, plugs new.
I am not getting any voltage at ECU connector from Crank sensors. Bentley says I should see variable DC voltage with cranking but I see nothing.
Next steps/ideas welcome.
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Set your DVM to AC, not DC. Then you should see a small voltage (around 2V AC) on the engine speed sensor, and a lower voltage (0.2-0.5V AC) on the ref sensor.
If not, then you found the culprit.
But since you said you have spark, these sensors should be OK. How do you know for sure you have spark?
Also check ignition dizzy and rotor are set correctly, as the coughing makes me think of inverted positions or wires.