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What would cause a 931 fuel pump fuse to fail?
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1137
Location: Washington DC area

PostPosted: Wed Oct 21, 2020 4:09 am    Post subject: Reply with quote

Sounds like your issue was the negative terminal on the battery (intermittently not connected). If your radio dropped on and off at the same time as the car running rough, they both share a need for a ground. Clean and clamp it tight, then drive.
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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
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chuck21401  



Joined: 20 Feb 2005
Posts: 322
Location: Annapolis, MD

PostPosted: Thu Oct 22, 2020 2:17 am    Post subject: Reply with quote

Fifty50Plus wrote:
Sounds like your issue was the negative terminal on the battery (intermittently not connected). If your radio dropped on and off at the same time as the car running rough, they both share a need for a ground. Clean and clamp it tight, then drive.


Yeah, it does seem like a grounding issue. It's possible that the negative terminal was loose. It's definitely tight now. And the cable running from battery to the body looks like new including the bolt to the body.

I'm going to double check other grounds. When I was under the dash last time I checked the grounds...everything was tight and looked like the PO had cleaned each ring connector and there was new bolt there as well.

The ground from the alternator to the intake manifold looked old so I bought a replacement for $12. I plan to replace that...but looks like I need to move the alternator to get the bolt out....not a big deal...just a bit more involved.

And will also check to see that other wires are tight......maybe something is coming loose from vibration.


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