Quote:
Originally Posted by fbrown540
The key not turning the engine off actually happening fairly frequently back in the day when these cars were fairly new. The cause is generally a feedback loop that keeps powering the ignition. You can test for this by simply unplugging the wire to the alternator. If the engine stops with the key off and by unplugging the alternator wire, you have a feedback loop.
If you have a feedback loop, You could leave the alternator unplugged while you trouble shoot the high idle rpm.
Some causes are:
- lack of a resistor in the GEN light line.
- not properly converting the wiring when swapping from an external to internal regulator. This seemed to happen to many of my friends back in the early 70's.
- improper conversion from a points type distributor to a electronic one. Again this happened to many of my friends.
It been so long that I don't remember what was done to fix the problem, but the fix was very minor in all cases.
I don't know if this applies to your engine, but many GM engines of the 60's had a thin metal plate between the carb gasket and the manifold. Leave the metal plate out and the engine won't idle. I had seen many of my friends leave the metal plate out and couldn't get their engine to run very well.
Maybe someone with more recent experience will chime in.
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yes indeed- it was a feedback loop!
you were right!!
thank you very much for your comments!!!
danny