Question about 2000 Saturn SL

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Idles rough , no acceleration 1 & 4 cylinder not firing , service

I parked a 2000 Saturn Sl1 over the winter and when started this spring it runs very rough , idling is erratic , acceleration is very poor , service engine light flashing after a couple of minutes . Pulled individual spark plug wires and found that there was only a spark on cylinders 2 and 3 --the engine actually stalled when either 2 or 3 was unplugged , but nothing happemed when disconnecting 1 or 4 . Is it a coil problem ?

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  • eazb52 May 10, 2010

    Thanks for the advice .

    Cylinder 1 & 4 are on one coil and 2 & 3 on the other , correct ? Would you have to physically remove and swap the coil modules or just the connectors at the coil ? Would you have the part number for the coil module ?



    The spark plugs were new and installed before for about one month before being parked .



    Thanks

  • eazb52 May 10, 2010

    Thanks for identifying a failed coil .

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Yes, these are misfires on cylinders #1 and #4 if nothing happened when disconnecting #1 or #4. First, replace #1 and #4 spark plugs with good pieces, (eventually by #2 and #3 spark plugs). Test engine running. If same bad erratic idling & poor acceleration caused by cylinders #1 and #4, then ignition coils #1 and #4 are damaged and need to be replaced! You can also swap ignition coils between cylinders #1 and #2 & #4 and #3. If misfires occur now on #2 and #3 cylinders, then ignition coils #1 and #4 are damaged and need to be replaced!

Posted on May 10, 2010

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