DME ground where?

[krshome]

Can someone help me find the main ground wire for the DME on a 1988 911 Carrera coupe 3.2 pictures are worth a 100,000 words. Thanks

[aj88cab]

According to the Bentley Manual there is not a single ground conductor, there are 5 (pins 5,10,16,17,19) and the ground point for these is the ground post on the #1 intake runner in the engine compartment. Sorry no picture, but you can't miss it if you take a look.

[JAR0023]

Originally Posted by aj88cab

According to the Bentley Manual there is not a single ground conductor, there are 5 (pins 5,10,16,17,19) and the ground point for these is the ground post on the #1 intake runner in the engine compartment. Sorry no picture, but you can't miss it if you take a look.

+1 Unless you have removed your aux fan you'll have to peek around the duct work on the left side of the engine. -J

[krshome]

Is there a ground closer to the DME where as to kill the power to the DME?

[911pcars]

Originally Posted by krshome

Is there a ground closer to the DME where as to kill the power to the DME?

An alternate plan is to kill (open) the source wire to the DME with a switch.

Sherwood

[krshome]

Originally Posted by 911pcars

An alternate plan is to kill (open) the source wire to the DME with a switch.

Sherwood

Source=hot wire?

[911pcars]

Originally Posted by krshome

Source=hot wire?

Yes.
Source = hot wire = 12VDC

Consult a wiring diagram to be sure it's the correct one.

[Joe Bob]

Brown wire.....ground.

[JAR0023]

hidden kill switch ideas for 84-89 cars

[steely]

Originally Posted by krshome

Source=hot wire?

power comes in on pins 18, 20, & 35 from the DME relay.

Kill the relay, kill the DME.

Buy a Bentley, now.

[steely]

[Tippy]

The Bentley has lots of wiring diagram issues for the C3.2 beware.

The worst discrepancy is the crank bolt torque. I nearly chunked my crank pulley because I used the torque spec given and it was 50% under torqued.

[steely]

Crank bolt torque has zero to do with DME I/O, but I think here is a point made there.
Best to verify against the 3.2 Bosch schematics like I did - and verify torques elsewhere (when that subject comes up).
PM me if you need schematics so you can verify yourself.
Watch out too for good info instead of vague warnings.

[krshome]

Thanks I'll pull my seat tomorrow and look for the brown wire going to the DME.

[Quicksilver]

I would hazard a guess that disconnecting the ground when running would have a chance of damaging the DME.

If you want to kill the car put a disconnect on the crank sensor. It will stop sparking immediately.
To disable the car pulling one of them slightly loose works great.

[Quicksilver]

Originally Posted by Joe Bob

Brown wire.....ground.

Ground wire #10 = Cali emissions.