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Registered
Join Date: Aug 2003
Posts: 20
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Ignition Wires - need help
From time to time, on my 1987 911 Carrera Cab I've had a little trouble with the #6 spark plug fouling. Cylinders perform well in the leak down tests so I've now turned my attention to the electrical system.
A few days ago, after detecting a miss in the ingnition, I removed the #6 spark plug connector from the engine. I had the engine running and was going to see if I could visually confirm a spark. As it passed my the air intake, a spark jumped from the side of the connector to the metal air intake. Upon further examination I realized that the plastic shroud that covers the point where the connector connects to the spark plug collapsed and the resulting air gap was providing a path for the electrons out the side of the connector. So I replaced the connector and figured all would be well again. When I replaced the connector and started the engine, it still sounded like it was missing on one cylindar. When I placed my hand by the exhaust I could feel a slight puff, puff, puff instead of a steady exhaust flow. By this time it was dark outside and a I turned off a work light with the engine still running, I noticed a little spark coming from the side of the #6 spark plug wire and jumping onto the fan housing. So now I've completely taped that wire with electrical tape and have ordered a new set of wires. I'm thinking that they all might be marginal at best. On the road, the car still seems to have a miss at low RPM's and is very slow to accelerate from a low RPM start. If I get the RPM's above 4,000 the car is like a rocketship. Even when accelerating from 2000-4000RPM its slow and then after 4,000 is like the car wakes up and takes off. Wondering if there are other tests I can do or if people have other suggestions. I've got my fingers crossed that the new wires will do the trick. Don |
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11-10-2003, 05:13 AM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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Just a wild guess.
the plugs demand a variable voltage depending on engine load. Perhaps the 2k-4k load is drawing a higher voltage which is finding another ground besides the plugs........Ron
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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11-10-2003, 06:29 AM
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Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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I did a search and found a lot on the subject:
Ignition wires which spark plug wires?? ighlight=Beru Slight stumble under acceleration Stumbling at low rpms-'88 3.2 Carrera Cheers, Joe |
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11-10-2003, 07:54 AM
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Get a set of manecore wires and end your trouble. I found a set on the Net for $110.
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87 Carerra Coupe 04 GMC Yukon 07 Mazda 3 00 GMC Sierra |
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11-10-2003, 01:02 PM
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