Question about 1990 Buick Riviera

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Buick not starting after running

Why when you steam clean engine compartment does this affect cps? but rain does not bother it? sounds goofy to me

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Rain Does NOT DIRECTLY Get into Engine Comp.
Eng. Electronic Components Must Be DRYED With High Pressure AIR After Steam Cleaning

Posted on May 31, 2009

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2006 ford free star when it rains the PCM gets wet and runs rough. Today it has rained for 3 days @ won't turn over. Battery is fine. Only a problem when it rains.

Rain should not affect your car starting. It sounds as if your battery is failing. Put your headlights on and get someone to turn the key with you looking at the headlights. If they dim to a glow-worm, your battery is not powerful enough. Sometimes a cell will fail and although your get 12 volts, you don't get enough cranking amps.

Regarding starting in damp weather, you can try this. Spray all the ignition leads with WD40 and also the inside and outside of the distributor cap. You can also try this which worked for me on an old Datsun that didn't like damp weather. Get some broadsheet newspapers and tape them together to make one large cover for the engine compartment. Make is about 10 sheets thick. Run the vehicle with this all over the winter. When you drive the paper warms and keeps the leads warm. When you park, any moisture in the air goes into the paper and doesn't condense on the ignition system. Make sure the paper is away from moving part like the radiator fan and the exhaust manifold. Check it after your first short drive, it should stay in place.

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Well I was originally thinking maybe the mega-fuse in the engine compartment since you have so many things not working.  Then considered the computer.  You may want to consider checking these out.
I went to MSN auto for your vehicle and under reliability, you can see that one of the engine problems is the Crankshaft Position Sensor (CPS) and it notes that failure of the sensor will keep the vehicle from starting.  This shouldn't affect your gauges, but you might have the sensor checked out.  Hope this helps.

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