Extreme Humidity - Car started rough and through P0301 and P0302

[k_h_d]

Over the weekend we had strange weather with extreme humidity. The inside of my garage was literally dripping with water and everything was wet with condensation. I think its because the weather warmed up quickly, was humid, and the inside of the garage was still very cold.

My question is could the extreme humidity and condensation get into coil packs and spark plug tubes causing the misfire situation?

When starting the car this morning after it sat all weekend in the extreme humid conditions it through P0301 and P0302 codes. Misfires on cylinder 1 and 2.

After letting the car sit until the afternoon today when everything dried out it was fine and started / ran fine.

I have an appointment to have the official codes read and check out the issue. Should I keep it or wait and see if it does it ever again?

Car is a 2007 with 41,000 miles on it. Is it likely that at 9 years old I need to change out the coil packs, tubes, and plugs?

[Arne2]

This would be better asked in the water cooled tech forum, most of us here have no experience with the stuff your car has.

Porsche 996/997/991 Forum - Pelican Parts Technical BBS

[twistoffat]

Its the coil & plugs most likely. Where they are located is a weak spot. From continuous heating and cooling the plastic casing cracks and moisture gets in. Its a relatively cheap fix but its a shame it happens.

[Trackrash]

Originally Posted by Arne2

This would be better asked in the water cooled tech forum, most of us here have no experience with the stuff your car has.

Porsche 996/997/991 Forum - Pelican Parts Technical BBS

My thought as well.

FWIW. When high voltage ignition components get dirty or when insulation gets worn and wet, you can get misfire or non starting.

I have had this happen several times. On VW Beetles (air cooled) I have had to clean the insulators on the spark plugs. Usually after the first rain of the year. This solved the problem each time.

On my daughter's car recently, I had to replace the plug wires to fix the no start issue.

If you take it to the dealer or mechanic, most likely they will replace components to fix the issue.

The question is, do coil pacs need to be replaced periodically? Or will routine maintenance take care of your problem. An expert on these models may know the answer.