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Registered
Join Date: Feb 2001
Location: South of the Mason-Dixon Line
Posts: 3,722
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oxidation on coil wire stops me dead in my tracks!
I took my 1973.5T out for a run yesterday considering how warm it is here in the south land and after a good 15 mile ride the car just stops! I tried cranking it up and nothing, not even a burp! Luckily I was on a hill and put it in neutral and rolled into a residential neighborhood.
Well, I went about checking the fuel first and pressing in the sensor plate and with the ignition on gas was charging up the injectors and the odor of gas was evident. Next, the distributor cap came off, points checked and cap checked. All okay. I then pulled the coil wire down from the coil and what do ya know, a lot of green oxidation coated the copper end. That was the culprit!! I managed to clean up the end fitting and the car started right up and ran a hell of a lot better. This happened to me many years ago when I drove my 1985.5 944, so I figured I would check the coil wire on my 911. I ordered a new set of spark plug wires (BERU stainless covered fit for CIS) and learned another Porsche old car lesson. I call it oxidation but others might use "corrosion". I believe moisture is the culprit although some have said, "grade of gas" and "electrical surging". Anyone ever have the same experience? Comments on cause? I will coat my next set of spark wire boots with dielectric grease to keep any moisture away and check the coil wire occasionally. I am glad I discovered the problem dead on the side of the road................an hour or so before sunset. Keep this one on your check list if you have the dizzy/cap/coil rig. Bob 1973.5T |
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12-27-2021, 11:50 AM
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Join Date: May 2002
Location: Portland, Oregon
Posts: 12,655
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Had a similar issue with my 911 this summer. I was checking my plugs for excessive oil and when I started it up I had a misfire. When I touched the #5 wire I got a jolt. Pulled the wire and found green corrosion on the dizzy cap end. Checked the others and they were ok. Cut the bad end off and installed a new connector. Put. New cap on and good to go. No idea how it happened.
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Harry 1970 VW Sunroof Bus - "The Magic Bus" 1971 Jaguar XKE 2+2 V12 Coupe - {insert name here} 1973.5 911T Targa - "Smokey" 2020 MB E350 4Matic |
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12-27-2021, 12:45 PM
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Use dielectric grease on the contact areas also.
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12-27-2021, 09:23 PM
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Join Date: Feb 2001
Location: South of the Mason-Dixon Line
Posts: 3,722
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I plan on using the grease everywhere I can to block out moisture, especially all the distributor cap wire boots.
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12-28-2021, 10:09 AM
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Had problems with beru wire ends that attach to the spark plugs coming apart. Do a search. Almost had a piece fall into the sparkplug hole while changing plugs. They were brand new.
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12-29-2021, 02:31 PM
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Sounds like you've got some verdigris going on.
https://forums.pelicanparts.com/porsche-911-technical-forum/1069035-verdigris-my-cap.html Best, John
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82 911SC coupe |
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12-29-2021, 04:20 PM
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Join Date: Feb 2001
Location: South of the Mason-Dixon Line
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Yes John, definitely oxidation not corrosion as some say.
Car is never in the rain, but it was in the shop for some repainting at the rear lid and water got into the coil wire cover from the wet sanding, or so I think. Either way, I just received my new set of Beru wires and it should be fine. |
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12-31-2021, 10:23 AM
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