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How do i fix a rough running after warming up in wet weather

Starts running rough in damp or rain engine light starts blinking or it may stay on

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I don't really know the answer, however, I would like to share my story with you, in case this happens to be the case with you. My older Volvo had all kinds of problems but only when warm and when it was wet outside. I had a mechanic that was throwing parts at it until my dad told me to go to an electrical specialist. He found out that the ground to the chasis of the car was not good, and in fact, when it was hot, it actually got red hot. The water aggravates electrical shorts. A bad ground is more common than most people think.

I hope that helps.

Posted on Apr 26, 2015

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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.

Dec 02, 2015 | Ford Cars & Trucks

1 Answer

Raining for 3 days and my 2006 ford free star won't turn over. Battery is good, starter clicks no more. PCM has been wet before. Waiting for dryer weather and try again.


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.

Dec 02, 2015 | Ford Cars & Trucks

2 Answers

Hey there. Ive got a 98' jimmy 4.3L. In the rain or damp weather my engine light comes on with misfires. Once it is in gear it has a rough idle and when accelerating it is slow an takes alot of power to...


Some of these vehicles had issues with water getting under the hood through the seal at the cowl panel and getting into the back spark plug tubes, once the engine warms up and the water evaporates the engine will run fine. There is a replacement seal thatyou can purchase to solve this problem. Hope this helps.

May 11, 2014 | Cars & Trucks

3 Answers

I have an 04 Escape when it's parked in damp or Heavy rain humid conditions upon starting engine vehicle idle's rough and check engine light blinks.Loss of power in the excellerator will only run top...


In the olden days I found wet weather hard start was usually an indicator that new plug wires and a distributor cap were needed. However your vehicle probably does not have a distributor and may well not even have plug wires. However as a first measure I would still get a can of moisture displacing spray at any parts store, remove the individual coils from the plugs and give the end of the plug and the female connector of the coil a good spray. And make sure the well the plug sits in is nice and dry.

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1997 Chev Cavalier not starting wet or damp weather


the destriper cap on my car had moister in it .i cleaned it up and it started right up,

Jan 20, 2009 | 1997 Chevrolet Cavalier

1 Answer

Starting in damp weather 1993 240 wagon, auto/od, 235k miles


perhaps you need a new cap and roter a new spark plug wire set. they don;t like moisture. also check to see if you have any broken or leaking vacuum hoses. the worse case senerio would be that your head gasket is leaking--at cold temps a little antifreeze will enter until everything warms up and it seals shut due to metal expanding. but since you say it's cold weather only--this probably wou;dn't be the case. good luck.

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replace distribudor cap

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1 Answer

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Replace the distributor cap, rotor and ignition wires with Genuine Nissan Parts and you should be ok.

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