Question about 2002 Chevrolet TrailBlazer

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Cylinder #1 misfire

Computer says cylander number 1 is misfiring. Where do I find it?

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#1 cylinder is the first one on the front of the engine on the drivers side. the reason for your misfire is most likely either a bad plug, bad plug wire, the coil pack or all of the above

Posted on May 20, 2009

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On the Trail Blazer the # 1 cyl is the very front one. You will thve to remove the hose clamp on the breather, the clamp on the throttle body and the plastic box on the top of the engine. It is held in place with two 10mm bolts on the passenger side top of the motor. The ciol on the #1 cyl is held in place with 1 10mm bolt and unplug the wiring. The plug is a 5/8 plug socket. Good Luck

Posted on May 20, 2009

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I'm guessing you have a v-6 in that. The # 1 cyl. is the furthest forward on the drivers side.

Posted on May 20, 2009

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The vibrating tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
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a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

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Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
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P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
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