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not sure what you said but. seems the battery is discharging,? 12.6v is fully charged, own a voltmeter? try a good loaned battery , does it start the car,? i think you meant? i can jumper cable start my car at any time. (off another running car) but after running my car, the battery discharges and it will not crank at all. right? this means ,the charging system on your car is bad. if the starter cranks great, then the engine is flooded or is in great need of a tune up (sparkplugs etc) if flooded try the super secret in the op guide, crank with throttle wide open , this magic trick cuts all fuel injection allowing the flooding to purge away, and eventual starting. my guess 2 is the car wont start, so you crank the battery flat you jumper start it and it runs. (luck) then day 2, same deal cranks ok but wont start.. ever tune up the engine?
Are you saying the engine cranks but won't start, or the engine won't crank ? If the engine does not crank, you would check for voltage at the starter, the neutral safety switch, and the key switch as well as the ground connections.
Sounds like your battery is just too dead, has enough juice to light up the system for a minute but cranking drains it and if it wont charge then deff fried, you could try removing the battery and starting the car with cables to confirm the starter still works. If a bettery is too dead then when you are jumping it, it takes to much of the power just trying to get through the battery.
If it does turn over and electrical works, then the problem is unlikely the battery. You can try jump starting. If it cranks when jump-starting it may be a weak battery, starter motor or alternator, but I don't think that this is the problem.
Check if there is spark on all cylinders. Do a code scanning (this car is OBD1, you will need to do the scan at the dealer place or to find a BMW OBD1 tool- Universal OBD2 scanner will not work on a 1994 BMW). If the codes return misfire or mixture related errors check fuel pressure, check sensors and parts that determine the mixture (MAF/MAP, AIT, O2 sensors, IAC and EGR system), check the vacuum system for leaks and check the crank sensor.
well in this case it can be the starter. you need to check if you get power to the skinny wire on the starter wile you crank. if yes then it is the starter. in worst case if you drove the car with out oil or if it got over heat too much. engine could be locked.
I have a saab 9.5 2000 2.3t, when I start my car it only crank but won\'t started. it is the alternator because I tried to jump it and it does the same thing, please help
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