95 530i Engine will crank, but not start

[eelley]

it may not be energized if the engine is not running, no matter you are trying to start it. Best way to test fuel system is to bypass the pump relay, you will have a permanent pumping condition as long as the pump is OK. You can even hear the hissing of the fuel going trough the fuel pressure regulator. I would put the jumper there and try starting with the jumper in. If the car starts OK with the jumper, but not with the relay, then either your relay is wrong or your DME driving transistor responsible of energizing the relay is damaged.

To jump the relay you have to wire a jumper from the relay socket hole corresponding to pin 30 to the hole corresponding to pin 87. Careful not to miss it, as you can damage DME if connect 30 to 85. You can also wire jump some power to fuse F23 from a known good 12 Volts (Vbatt) source.

Guess you have already checked your CPS. No CPS means no spark and no fuel pump.

Javier

Thanks Javier and 632 Regal, I will test tomorrow and get back to both of you.

Eric

[saj3n]

Thanks Javier and 632 Regal, I will test tomorrow and get back to both of you.

Eric

Good Luck!

Had the same problem with mine... Replaced fuel pump, no avail... Nikasil problem, Engine needed to be replaced...

[eelley]

Thanks Javier and 632 Regal, I will test tomorrow and get back to both of you.

Eric

Sorry for the looooong delay in my response. I wanted to record my solution here so it could benefit others. Replacing the crank position sensor fixed the non-start problem.

[Tiger]

Mmm... so much for 'within spec' measurement.