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Three days ago I changed the water pump on my 1989 740GL wagon. I disconnect the battery at the beginning of the process as recommended in FAQs. I started the car after the changing the pump, added a little more anti freeze to bring the level to MAX - no leaks. The following day I drove the car for about 10 minutes, went into a local store and returned in 15 minutes or so. When I tried to start the car it turned over but didn't start immediately - after several tries and finally stepping on the accelerator the car started and ran OK. Next time I tried to start the car it happened again. I started it the same way. Several other times that day and the next it started without a problem.
This morning I tried to start the car in the garage and it failed to start. Went through the same proceedure as before - this time it didn't start. Looked for loose wires, faulty ground connections they seemed OK. Then I removed the number 1 spark plug to determine if it was getting gasoline - it was. Replaced the plug and tried again - this time it started.
Not sure there is an association between changing the water pump and the car not starting - I suspect anything that got wet would have dried by now. I did read that the computer "learns" over time to compensate for wear, etc. especially for the throttle setting. I was wondering if disconnecting the battery causes the computer to loose the information it has "learned" and it is not compensating for wear, etc. I don't know if the computer memory is volatile, much like the radio presets are? If so will it "relearn" the correct settings again over time?. Just a guess at the cause of the problem. It didn't exist before I changed the water pump. The fault code is 1-1-1 OK. Perhaps disconnecting the battery is not related to the cause of the problem at all.
Any help would really be appreciated. Thanks
WallyM
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