Car randomly turned ooff
05-20-2008, 08:04 PM
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Car randomly turned ooff well i turned on my car this morning to go to school and everything sounded good as usual and the car started on the first crank.i drove down my block and stopped at the stop sign.When i stepped on the accelerator the car suddenly turned off.I tried turning it back on several times but with no luck.The alternator would crank and i could hear the fuel pump working but it still wouldn't start.luckily my friend was leaving to school at the same time and we pushed my z to his house and i left with him in his car.When i came back from school i tried turning it back on and still nothing.after trying and trying it finally turned on.i let it run for a couple seconds and revved it a little.black smoke came out of the exhaust and it turned off again.Tried turning it on again and several cranks later it turned on. i drove it to my house and it turned off again before it got there.i managed to turn it on again and i let it idle for a few minutes. I drove it around again and everything seems fine now and no black smoke anymore.Any one know what the problem could have been? I changed the oil 500 miles ago, and i sea foamed the injectors about 1000 miles ago.I thought it might be the opti or the spark plugs but im not sure. any ideas?
05-21-2008, 12:25 AM
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The wierdest things happen when the (CPS) crankshaft position sensor starts ti fail, and it doesn't just fail all at once, I know its happened twice in 9 years to me. The symptoms you describe happened to me too.
Also, the CPS WILL NOT show any codes on the gauge cluster, it didn't show on mine both times it failed. But an OBDII scanner at the dealer showed it to be bad.
Could be your problem too.
Also, the CPS WILL NOT show any codes on the gauge cluster, it didn't show on mine both times it failed. But an OBDII scanner at the dealer showed it to be bad.
Could be your problem too.
05-21-2008, 10:22 PM
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05-24-2008, 01:50 PM
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I had the same symptoms, and they got worse, then got better (phantom problem) it would die and not start for a while. I replaced the Crankshaft position sensor after replacing the MAF and O2 sensors, the CPS was the problem. To replace it, remove the starter, and it's a black plastic L-shaped sensor attached to the block behind the starter. The part # is 12560228. It costs $41.59 @ GM parts direct.
