Question about 2000 Buick LeSabre

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#1 plug is miss-firing.I have replaced plug and wire,but keeps miss-firing only on#1 plug.have been told that coolant is possibly getting in #1cylinder.also I have been told #1 coil could be bad.witch is it,or could it be something else alltogether?

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Could only be a few things. The coil #1, Fuel injector #1, Stuck intake or exhaust valve, or blown head gasket allowing coolant into cylinder #1. Use a spark tester to check the spark coming out of cylindr #1 if checks good then ohm test the injector when it is warm. Check other injectors to compare. Do a compression test on cylinder #1 and test other cylinders to compare. If cylinder is low compression suspect valves and or head gasket. If compression is low then het a leak down tester to test if a valve is broke or sticking. On your sable i would suspect injector or coil most likely.

Posted on Oct 10, 2010

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You can check the coil. see spark test procedure--#3 at the following post: http://www.fixya.com/cars/r5821173-doesnt_car_start_gasoline_engines

If coolant is getting in, the plug should be wet and there should be excess steam in the exhaust.

If neither of these is the problem, do a compression test to see if you have a burned exhaust valve.

Let me know if you have questiuons.

Posted on Oct 10, 2010

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Check #1 cylinder if the misfire is fuel or spark issue!! Run the engine for 10 secs then shut off, pull out the #1 spark plug. Inspect the plug for wetness from fuel, if wet there may be no spark (coil or crank sensor failure). If dry there may be an issue with fuel injector or cam sensor. This may need advance diagnosis!!

Posted on Oct 10, 2010

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