Hi,
My 964 refuses to start. Engine turns but doesn't fire. No fuel is getting to the engine, nor is there any electricity going to the spark plugs. It's also interesting to note that the instruments are dead (although illuminated when the lights are turned on)
Fueses 1 to 16, 35, 38 and 39 have power going through them. All other fuses have no power.
Any ideas or sugestions would be much welcomed.
Thanks in advance.

 

Have you tried changing the DME relay? That will stop power to the fuel pump and DME computer/ignition.

 

Yes Rob, changing the DME relay was the first thing we tried.

 

Worth checking your earth straps and cleaning the connectors.
I've also heard of strange electrical gremlins with a faulty ignition switch.

 

Another easy check- the plastic connector to the flywheel sensor can disintegrate over time. It's behind the blower motor in the engine bay. If the ecu doesn't get a signal from that sensor, then it doesn't know that the engine is cranking.

 

motor is simple:
air
fuel
spark

you've noted you aren't getting fuel. So:
DME relay
Fuel pump
flywheel / reference sensor
grounds
relays in the chain

Fact you aren't getting spark and you aren't getting fuel to me says it's something with the communication of engine state back to the DME. Reference sensor or (pretty unlikely) the ECU.

https://rennlist.com/forums/964-foru...-91-964-a.html

 

All the instruments are dead? Kinda indicates a major lack of power feeds. Was anything done with the car since the last time it ran?

 

Yes, the engine had been removed for maintaince.

 

Ahhhhhh. I'd start with the plugs in the rear fusebox-but you probably knew that.

 

You can check the condition of the flywheel/reference sensor by opening the DME relay under the drivers seat, and used a multimeter set to AC voltage, across pins 47 & 48 of the large plug. iT's supposed to read 3 volts. Voltage less than this would indicate a bad sensor or connection.