PCM Case Needs to be Grounded? WTF?

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Aug 20, 2010 | 10:54 AM

rahgbag

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PCM Case Needs to be Grounded? WTF?

I'm swapping an 01 Camaro LS1+T56 into my BMW E36 and I have been having strange electrical gremlins. I knew I was looking for a loose ground, but this is very strange IMO.

If I ground the case of the PCM, everything works and it starts and runs fine. If I don't ground the case, nothing works. I'm pretty sure I have all the PCM's grounds hooked up properly.

What is going on?

TIA,
Robert

Aug 20, 2010 | 03:36 PM

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Try grounding the engine to the chasis. The LS setups have tons of grounds and they go to the motor. PCM is no different sounds like you have no connections there.

Aug 21, 2010 | 08:09 PM

NoGo

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I vote loose ground, or grouped ground causing you an issue.

Ensure both your block, heads, and transmission are all very well grounded. I try to avoid sharing ground points as well.

It has been my experience that these motors are very sensitive to grounds/interference. To the point that aluminum foil, joined grounds, and power wires in the wrong spot can cause running issues.

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