Question about 2002 Chevrolet TrailBlazer
Need to take off the plastic on the top of the engine (the plastic box) and the air cleaner hose that goes over to the throttle body. There you will see 6 coil packs. Remove one at a time (2 bolts each), under the coil pack are the spark plugs. I recommend using AC Delco 41-103's for the plugs, will idle better with these. When pushing the coils back on, make sure you hear or feel a little click, too many people install these back on incorrectly, which causes more misfires. If the misfire isn't corrected with the new plugs, check the coils. I also recommend cleaning your throttle body while you're at it, make sure to disconnect the battery while doing this. After it's clean, drive around for 5 miles or so to reset the computer.
If it has a very bad misfire, your check engine light should be on and OR blinking. If it's blinking, don't drive it. You'll probably pull a code of p0300, p0301 & so on which will tell you which cyclinder to focus in on.
Posted on Jan 04, 2011
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Posted on Jan 02, 2017
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