Question about 2000 Pontiac Grand Prix

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The engine kills when it's wet outside (raining or just rained)

Car is 1994 pontiac grand prix, and the engine kills when it's raining or extremely damp outside. It also has trouble starting after that happens. Problem has been quickly getting worse. Please help!

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  • Pontiac Master
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It is likely that your front oxygen sensor is getting wet.

Posted on Jun 19, 2009

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Car wont start when it rains


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1999 Pontiac Grand prix does not blow high fan speed on Max A/C.


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1 Answer

Why won't car start when it's damp outside


Mor often than not this is caused buy bad secondary ignition. Most likely the plug wires. What you can do when the car does start is fill a spray bottle with soapy water. With the engine running systematically start spraying the plug wires. If you hear the snap of electricity arcing or the engine starts to run rough your on the right track. Also spray around the coil(s) it is possible for the towers to be leaking. If this is the case the coil(s) will also need to be replaced. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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Why won't it start when it's damp outside?


The first thing I would look at is spark plug wires.

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Water on floor passenger side after it rains and after air has been running 2000 grand prix


Ac hose leak?
leaking heater core?

Hint: it leaks when it RAINS

If it were related to the heater core or the AC drain, it would be leaking when it is not raining also, so those diagnoses are not logical.

The grand prix has a long history of floor leaks from seal failures around the air intake under the windshield cowling, where RAIN water runs in.

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How to reset service engine light on 94 pontiac grand prix


You can disconnect the battery and wait about thirty minutes and this should turn of the light but if it turns back on you have a problem and need to have it scanned for trouble codes.

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