| [GMCnet] Suggestion, ground your distributor today! [message #294345] |
Sun, 24 January 2016 22:05  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Senior Member |
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Today I finally solved a two year electrical gremlin. Since installing the new S&J engine in the Clasco I have experienced a random backfire/misfire/hesitation. It occurred for no apparent reason and then went away sometimes for a thousand miles. I replaced everything I could think of - distributors, modules, coils, carb to EFI , fuel pumps, fuel filters, fuel venting, etc.
What I found today was what appears to have been a randomly high resistance ground where the distributor is held to the engine block by the rocker and bolt that holds the distributor in the correct timing rotation. When the resistance build up to the point the voltage drops below the threshold required for proper function, the Gmc misfires, hesitates and mimics all the symptoms of a bad module or coil. Those backfires might well take out an otherwise good coil or module causing a seemly unending random failure mode.
What I did to finally end this cycle was to drill and tap a hole in the aluminum distr body to mount a wire ground directly to the block. But, in addition, I had to replace the brand new coil in a brand new custom built distributor with an advance curve matched to the FiTech EFI.
Once that was done we have had no recurrence - yet! I will post if we do, but this scenario fits all the many symptoms and I think is a root cause solution. I suggest you do the same today whether you have experienced these symptoms or not.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed & hand crafted
in the 1907 former Masonic Temple building
in historic Kerby, OR
http://jerrywork.com
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Jerry & Sharon Work
78 Royale
Kerby, OR
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