Carpokes Porsche Forum

Ran the car earlier today and it was great - went to start it now and just get crank but not firing.
Fuel pump not engaging (but works if I jumper the DME relay pins). Tried a 2nd DME relay - no dice.
Next step is to swap the DME, but something else perturbed me.
After one failure to start, I just turned the ignition to ACC, to see if I could hear the Fuel Pump going (nothing), but there was a small jolt. That kind of concerned me so I disconnected the battery.

Anyone else feel that before?

Thanks!

FWIW- most recent work was replacing the clutch master and slave this week, so the starter was removed, but cables not disconnected

What do you mean by Jolt??

When I turned the key to acc, subtle rock of the car. Like maybe the starter for a very short impulse? But just momentary.

Hmmm, odd, ignition switch might be bad but i'd rule out the usual suspects first. Did you have tach bounce?

yea - I did see slight tach bounce when cranking. How much bounce is normal?
Also - bench tested the original dme relay per clarks garage procedure. Seems fine.

I reproduced the jolt by moving the key from acc to on (not to start). Seems like the starter pulsed, so I’ll check that wiring next

Bounce is a misnomer -- it's more of a tach twitch...

Does the boost gauge go to 1 when you turn the key on? It is powered by the KLR so a good proxy for whether the dme and klr are getting power.

Boost gauge stays stuck all the way left even when cranking.

Fuse 34 is good as well