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2004 trailblazer misfireing number 4 - 2004 Chevrolet TrailBlazer

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Posted on Jan 02, 2017

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SOURCE: cylinder #4 misfired on my 2003 chevy trailblazer

You didn't mention what engine size or really a question either but am just guessing that you may need help diagnosing the problem. I'm going to go by the most common engine in the Trail Blazer and that is the 4.2 liter 6 cylinder engine. There are several things that can cause a misfire in a cylinder but the 2 most common are either a bad coil or a bad fuel injector. The most common of those is the ignition coil. There is a separate coil for each cylinder and each of them are mounted on a spark plug. In the first picture you can see what the coil looks like and as you can see it has a connector and a boot on the other end that goes over the spark plug. Each one have thier own mount bolt as well. Also below is a picture of were each cylinder is at by number. I would just swap out coil number 4 with the coil for number 3 and put the coil that you got from number 3 and put it in number 4 (hope you got that) Plug all back up, clear any trouble codes, run the vehicle and if you end up now getttting a misfire in number 3 instead of 4 you know the coil is bad. If that doesn't work then you may be looking at an injector but there are several tests to rule that out that I am not going to post right now. I included some other pictures and instructions that should help. If you do happen to have the 8 cylinder engine (5.3 liter) this also has different coils for each cylinder but the set up is a litle different. If you need any other help or need the tesing procedures for an injector, feel free to comment/reply here or you can email me directly at with all your information and I will be happy to try and help. As I said the coil is the most common and I think this will clear it up once you diagnose it. Hope I was able to help.....


Posted on May 31, 2012


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