E38 won't start? This might help

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Oct 19, 2013 | 02:29 PM

Hotrod406

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From: Hamilton, MI

E38 won't start? This might help

Make sure the ecu case is grounded. I mounted mine with rubber isolators and the damn thing wouldn't start or communicate with HPt most of the time. I'm using the donor fuse block and the powertrain relay wouldn't work either. The powertrain relay is grounded by the computer through the case apparently because it works now that I ran a ground to the ecu.

Oct 19, 2013 | 05:25 PM

85MikeTPI

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From: Newark, DE

My E38 case isn't grounded. Perhaps one of the grounds in your harness isn't hooked up or broken.

Oct 19, 2013 | 07:40 PM

Hotrod406

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From: Hamilton, MI

Hmmm. I took this project over from someone else and I didn't install the motor or harness. I'll look over the wiring tomorrow.

Oct 19, 2013 | 09:23 PM

BP Automotive

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From: Columbia, Kentucky

You Do NOT want to ground the case, this can damage the ECM.

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Oct 19, 2013 | 09:32 PM

Hotrod406

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From: Hamilton, MI

Damn. I was hoping I could do that. When I grounded the ecu case the powertrain relay started working. Does that info give you any clues as to which wire is not grounded that should be?