Hi guys I have a question for you regarding my 2005 H2 hummer. Everytime I drive through a puddle of water or a fresh Creek no deeper than tire level I have an error code come up . The errer code number I forget just at the moment but when I plug my computer in the error is multiple misfire. Every time I drive through a puddle of water at speed or even going slow I get this error. It takes about a day for the misfiring to stop. I am wondering if anyone else has this problem and found where the water leaks in to cause the misfire.

 

Start your engine at night or in a dark garage and squirt the spark plug wires and coil packs with a water bottle, look and listen for spark jumping. It's a quick, easy and free test to determine if you have a bad secondary ignition problem.