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Old 07-19-2010, 01:36 PM   #1
Mr_blue
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98 Saab 900 SE no spark

I have a 1998 900 SE turb and it just died. I took the spark cassette off and my plugs were wet. So I thought, no spark. Is the crank sensor going to be my first choice on testing. and how do I test it?
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Old 07-26-2010, 10:06 AM   #2
saab84
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Re: 98 Saab 900 SE no spark

Failing crankshaft sensors will often cause intermittent missing from the engine and can be difficult to diagnose because they usually occur intermittently. A good way to test the crank sensor is to put a timing light one the number 1 plug wire (or the number 1 wire for the DI systems which is usually orange but check your wiring schematic first). On a properly functioning ignition system the timing mark will stay reasonably still when looking at it with a timing light or strobe tool. If the mark on the flywheel is moving erratically you may have a crankshaft sensor issue or a possible issue with the reluctant in the ignition distributor (if your car has one) causing a problem.

Hope this helps.
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