I would run a compression test on #5 to verify that the head gasket is not blown. White smoke is not good and water will cause a misfire.
SOURCE: 1998 Chevy s10 4 cylinder running rough
1- check there is spark come from spark wires
2- check the fire timing by looking for every wire in the right place
3- check there is injector signl
4- check for any vacuom leak
5- try to clean the MAF by brake and parts cleaner
6- try to reset all the code and see what will come after that
SOURCE: I have a code misfire cylinder 5 and I am not sure
Cylinder numbering for your engine is 1-3-5-7 on the left hand bank and 2-4-6-8 on the right hand bank (passenger side). To be sure where number 1 is look across the cylinder heads number 1 cylinder is always the head that is furthest ahead towards the front of the vehiclek, then count 3 cylinders back on that side, should be left, and that should be number 5. pull the spark plug first and check it and at the same time pull number 3 's plug and swap the coils from 5 to 3. If the plugs are bad replace them all. Then run the vehicle and see if the misfire code followed the coil to number 3, if it does you know you have a bad coil, they usually run about 90 - 100 bucks each, that is if the plugs or wire wasn't the problem. hope this will help you. good luck.
Testimonial: "Replaced plugs problem solved...Thank god 23 bucks and problem solved"
SOURCE: diagram of spark plug
Check this for 4.6 or 5.4 sizes engine...
2004 Ford Expedition 4.6 liter V-8 VIN "W"
2004 Ford Expedition 5.4 liter SOHC V-8 VIN "L"
Hope this help (remember comment and rated this).
Testimonial: "thanks for the info. I worked like a charm"
SOURCE: #2 cylinder misfiring or skipping.
Cylinder #2 will be the second cylinder from the front on the passenger side, and here is a diagram to help assist you.
Testimonial: "Excellent. My problem has been solved. Appreciate your help."
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