An illuminated Check Engine Light may be caused by an engine misfire due to water or engine coolant in the spark plug recesses.
Average mileage: 140,571 (90,000–177,000)
13 people reported this problem
Replaced spark plugs and since then I have to drain water from the spark plug holes. Was both sides but now just the drivers side. Back holes are the worst. Siliconed the wire harness but still occurs. Does the area need to "breathe"? Seems that if that is the problem, high humidity would condensate and drip down in the plug holes. But after hard rains with no driving, the problem occurs. Any ideas? email@example.com
My truck started hopping and jumping while sitting at a light and skipping while driving. I Now understand that's considered misfiring. My mechanic checked it and found the number one spark plug cylinder with the water in it. He left the water and because it wasn't a lot a month later it started again and found the reservoir was half full