Question about 1999 Buick Century

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Moisture causes engine to "buck"

I have a 1999 buick century with 195000miles. We recently changed the wires, plugs, top 02 sensor, and a metal plate located under the coil packs(not sure what it is called). In addtion to this the coil packs tested good. When it rains or water condenses the car will start but it "buck" on acceleration. It will only run 10 mi p/hr. Then it dies. Help! I am desperate, I do not know what to do? Advanced Auto Parts put it on a meter, it pulled a 1374 code missfire. On dry days the car runs fine but the engine light stays on. I have lost gas mileage in the process went from 33 city to 19 city! UGH!

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I would also consider using electrical sealer instead of replacing parts. They sell it at auto parts stores, and it effectively puts a waterproof coating over ignition parts like your distributor or coil packs and would prevent shorts.

Posted on Dec 23, 2009

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Rod, The first thing I would like to try is to take a pump water spray bottle filled with water. On a dry day when the engine is running fine, have the engine running and begin to "mist" water with the spray bottle on small sections of the ignition coils at one time. You want to see if you can recreate the problem. Continue to spray the coils, spark plug wires and spark plugs until you get the miss-fire. It should help you narrow down were the problem might be. If you do this in a relative dark area, you will be able to see the spark jump. A cracked coil tower or coil is possible.
The 1374 code is your 3X reference circuit failing. The "plate" you referred to is the ignition module that uses the 3X signal, among other inputs, to calculate ignition function.
Try the water mist test first and we can go from there.
Let me know.

Posted on Feb 11, 2009

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