scirocco75

Hi guys,
My 91 200 20valve sat for a week, and suddenly will not start, I have found no power to fuel pump relay, injectors or ignition, although it will crank just fine. I found 1.0 ohm at the timing sensor plug, but only .08 at the rpm sender. Is the rpm sender essential to completing this circuit? Anyone have any ideas?

Kneale Brownson

You need both to tell the ECU it's OK to run the pump and provide spark, I believe.

audiqv8

If the answer is no then replace the rpm sensor.

You need the following signals to the ECU before it will send a trigger signal to the coil

CKP (crankshaft postion signal)
RPM (rpm signal to tell the ECU how fast the engine is running)
Hall effect (aka cam signal from the distributor)

scirocco75

Thanks for the help, As it turns out, last year when I replaced the clutch, I had frayed the rpm sensor wire and although it functioned fine since then, it decided to be an issue now. After repairing the wire, it was back in running form. Thanks to all for your very specific and helpful advice.
Michael