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rwest rwest is online now
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Join Date: Jun 2009
Location: St Paul MN
Posts: 5,504
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Quote:
Originally Posted by montauk View Post
Could it be a sensor issue? With Haltech, sensors have a specific wiring requirement. The grounds cannot be chassis ground, they need to be sensor ground. Sensor ground wires are not bonded to the chassis.
Not saying never, but I changed nothing with the wiring or the install before the problem started, I followed all the instructions on grounds and shields and because it is intermittent, it leads me to believe a component is glitching. At first it seemed to be heat or time related, but sometimes it does it right away.

I emailed with Al a few days ago after my composite logging and Al surmised that I was getting good signal from the EDIS module and I was showing spark advances with the timing light. Coil might be the likely suspect. But I have put in a different used one and that didn’t change anything and both coils bench test fine and aren’t a usual failure point.

A new coil is from $100-200 and might not fix it.

But as I have said before, EDIS just isn’t a good long term solution for ignition any more as it is getting harder and harder to get parts.
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1977 911S Targa Chocolate Brown
Old 10-22-2025, 08:44 AM
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