why does my truck lose power shortly after driving in rain?

Asked by May 26, 2015 at 06:49 PM about the 2001 GMC Sierra 1500 SLT 4WD Extended Cab SB

Question type: Maintenance & Repair

When I scan I get code indicating #6 cylinder misfire. I recently replaced spark plug wires but it still does it. I look for any sign of moisture near plug and coil but they are dry. The truck has aprox. 175000 miles and runs great when on dry road.

3 Answers

Lol I have an explorer every time I drive in the rain the lights blow out

5

You might have a Crack in the cylinder which would allow water in which could be why it misfires

59,175

Wait until it gets dark and raise the hood. Start the engine and use a spray bottle to mist the area with water. You'll probably see it start sparking and the truck will begin to misfire. Could be a hairline crack in the spark plug or a plug wire not properly seated. When a vehicle is susceptible to moisture it's going to be an ignition system problem 99% of the time. HTH. -Jim

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