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Exhaust Cloud when it Rains

I have a 2001 Saab 93 with about 88,000 miles on it. Recently, I’ve noticed that when it I start it up after it rains, there’s a cloud of smoke. The cloud of smoke varies depending on the amount that it’s rained…a lot of rain, big cloud; a little rain, small cloud; no rain, no cloud.

So far, no one in Denver has been able to offer up suggestions and we’re all baffled by the rain factor. It doesn’t rain much here, but that doesn’t mean I don’t want to know what the problem is so that I can fix it.

What color is the cloud?, White or black.

I guess I’d have to say black; although it’s more gray than anything else.

I think new plug wires and distributor cap (if applicable) is step one along with any maintenance prescribed in the manual

A black cloud is carbon from poor combustion, in this case due to poor ignition. You have a cylinder or more not firing properly when the ignition system is wet.

Culprits include everything in the ignition system including the igniter and the coil(s).