Misfire Issues - 2007 Tahoe 5.3
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Misfire Issues - 2007 Tahoe 5.3
I have a 2007 Tahoe 5.3 that after driving on the highway for 2-3 hours the engine will develop a misfire. The plugs and wires have been changes approx 15k ago. I run Autolite Iridium plugs.
It happens in random cylinders, over a two month period it has shown up in cyl 1, 6,7 and 5 and when the plug is pulled it isn't fouled. I replace the plug and it stops the misfire and runs fine. I am leaning toward the following:
1. Fuel problem - I try to stay away from Ethanol but sometimes that is all that's available. I travel in the midwest.
2. Fuel injector sticking
3. Coil - this is probably the lest of the probable
Any input would be greatly appreciated.
It happens in random cylinders, over a two month period it has shown up in cyl 1, 6,7 and 5 and when the plug is pulled it isn't fouled. I replace the plug and it stops the misfire and runs fine. I am leaning toward the following:
1. Fuel problem - I try to stay away from Ethanol but sometimes that is all that's available. I travel in the midwest.
2. Fuel injector sticking
3. Coil - this is probably the lest of the probable
Any input would be greatly appreciated.
