QuestionI have a 1993 Concord that has 211,000 I recently had a problem with a crank position sensor in which the shop replaced which didn't fix. Come to find out or at least they said there was a short in the wiring harness to that sensor. Since then I have had trouble with the car surging hard just about the time it hits operating temp. In addition the battery will go dead leaving me on the side of the road. I have replaced the battery, plugs and wires, and had the alternator tested. I am thinking short, bad relay or unplugged wire just not sure where to start.
AnswerHi Rick,
I assume this '93 is an LH body vehicle,that debuted in '93, if not let me know. Also tell me which engine.
When you have an unexplained draining of the battery what you need to do is put an ammeter in the line between either the - post clamp or + post clamp and eithers' respective battery post so you can see how much ignition 'off' current you are drawing. It should be less than 100 mA. If not, then you begin to remove fuses, one at a time, from the power distribution box to see which one cause the current to drop down to 100 mA or so and then you evaluate what sub-fuses behind the dash are supplied by the fuse in question. In light of the history then we should be able to find a sub-fuse and a circuit on that fuse that is suspect. So may I suggest that you start there and let me know what you find. I have the '94 wiring diagrams for that LH body set of cars to consult. I'll await a report.
Roland
PS what do you mean by "surging", other than maybe that the engine starts to run more normally as compared to when it is cold, or?
Before it warms up, the mixture and timing are operated on presets, after that it goes into closed loop mode and utilizes all the sensors, most notable the O2 sensors to adjust the mixture.
You can use the Thank and Rate tab to get back to me quickly without having to wait for me to be "available" for a follow-up question.
Roland
