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Registered
Join Date: Apr 2002
Location: Massachusetts
Posts: 45
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mystery wire?
Been having a idle issue with my 81 911sc. Idle fluxuates randomly between 1100and 1600rpm. Was looking around for a vacuum leak and found this ground lug at the back of the engine that was disconnected and appeared to be making intermittent contact with the engine block. When I ground the lug, the engine idle drops from 1600 to 1100rpm and is stable. What is this ground connected to? (see pic below)
Thanks, Mark  
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MAD4PORSCHE  81 911SC Targa |
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04-20-2013, 02:06 PM
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Join Date: May 2008
Posts: 2,948
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There is a threaded ground post/stud on the left bulkhead near (behind) the fuel filter and accumulator, you have to "feel" for it or use a mirror. Will the ground (brown wire) harness reach that?
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Keep the Shiny Side UP! Pete Z. |
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04-20-2013, 02:34 PM
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looks like a ground wire harness, any strange or non working stuff on the car? might be the problem with the idle
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08 Cayenne Turbo |
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04-20-2013, 02:44 PM
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Location: Massachusetts
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It's definitely the cause of the idle and I did find a lug on the engine to connect it. I was wondering what module the ground is for(maybe the computer?) I comes from the bulkhead connector right behind it to the right of the shock tower.
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MAD4PORSCHE 81 911SC Targa |
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04-20-2013, 03:18 PM
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if you cant find it, on the forward of the left inner fender, by the fuel filter, you can try a bolt on the engine itself for now.
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08 Cayenne Turbo |
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04-20-2013, 03:21 PM
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Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
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Bolt.
Quote:
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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04-20-2013, 04:11 PM
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good eye
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08 Cayenne Turbo |
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04-20-2013, 05:46 PM
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Join Date: Oct 2008
Location: Norway
Posts: 36
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Looks like the ground for the engine sensors. Mine is connected to the alternator.
Jon |
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04-23-2013, 04:09 AM
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