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Pontiac Forum: extrange problem by: humidity, low temperature and condensation
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  #1  
Old September 12th, 2018, 09:49 AM
thundercat thundercat is offline
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extrange problem by: humidity, low temperature and condensation

It's a Pontiac Montana 2003

Since I bought the car, sometimes later a heavy rain, specially nocturnal rains, next morning the car don't reach the 1500 r.p.m. (I don't know electrical, filter/pump gas, tx ????). If just working in parking half hour or some more the hot dry and worked good. If later the rain come several hour of intense sun (I lived in Florida) the problem never appeared. I assumed they were water leaks

I moved to Georgia (the car behaved very well during the trip) and now it sleep under a shed free of direct rain/sun

Later 2 days without use and at night heavy rain with some low in temperature, no drop of water touched the car. The problem appeared again

What caused the problem?
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Old September 12th, 2018, 10:11 AM
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melsg5 melsg5 is offline
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I would check the ignition coils and connections for evidence of corrosion and test or replace the spark plug wires.
On a damp night if you have the problem open the hood and look for sparks.
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Old September 19th, 2018, 08:55 PM
thundercat thundercat is offline
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Thanks. I found 2 ignition coils with fissures of few millimeters, enough for permit arcs when is present humidity condensation. I changed the 3 for new ones, and will continue to observe. If I don't write any more in a few months the main problem will already be solved
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Old September 26th, 2018, 01:56 PM
thundercat thundercat is offline
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3 days unused, next morning of night rain the problem returned. Spark plug wires was changed 2 months ago, I will continue checking at the weekend...
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Old September 30th, 2018, 07:21 AM
sergeimoskva sergeimoskva is offline
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Hello! Let me give you advice. Unscrew the mass on the body. The contact is located near the fuse box housing. It is necessary to clean the terminals and connect them back. (See picture)


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I have a Opel Sintra 2.2i 16V , Engine Ecotec .The body, suspension and much more - is similar to Chevy Venture (1997-2004) , Pontiac Trans Sport (1997-1999), Pontiac Montana (1997-2004) , Oldsmobile Silhouette (1997-2004)
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Old September 30th, 2018, 09:50 AM
thundercat thundercat is offline
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3 ground connectors: this, the other similar opposite side (between the cooling water depot and the cruise module), and the connected at engine body by the starter

The 3 ones, since I bought the car 5 years ago, they were unscrew and cleaned, at least 2 times
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