Posted by Christopher Mikesell on December 14, 2014 at 12:35:00 from (107.134.164.80):
In Reply to: OT - car stalls posted by Northvale - PA on December 14, 2014 at 08:34:18:
I had similar problems with my 1992 Pontiac Trans-Sport with the port fuel injected 3800. It was bad wiring from the main wiring harness to the ignition module. The insulation had completely disintegrated off of all 13 wires beneath a section where they were wrapped with electrical tape. Only corrosion and remnants of the insulation were keeping the wires from contacting each other. When I would hit a bump in the road, the engine would occasionally start to misfire due to a poor/corrupt cam/crank signal through the harness (some of the injectors would miss, but I still had spark on all cylinders). This was a very difficult problem to diagnose, since the harness tested fine with a multi-meter. To me, it sounds like you have a short in your electrical system, or a poor connection to your alternator/battery. Look for burned or worn through wiring. Also, make sure that the ends of all of your charging system cables and connectors are tight and in good condition. Keep in mind that stalling problems can be caused by a faulty security system switch or worn ignition tumbler. Additionally, the ignition module probably gets its ground through the frame of the module and its mounting bracket. A bad connection here will cause all sorts of intermittent ignition/injector problems, and these will show up first at low rpm.
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