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Tech Talk => Engine Mechanical / Electrical => Topic started by: 74 SleekCraft on August 28, 2014, 06:14:45 PM

Title: Any chevy techs on here?
Post by: 74 SleekCraft on August 28, 2014, 06:14:45 PM

It's not boat related but I have a 02 Tahoe with a 5.3 vortec and it has a misfire in cylinder 3. I changed the plugs wires and coil. Checked compression and all cylinders are around 160. Anyone have any suggestions on what could be going on? I tried to google it and all I can find is Info for random misfires.


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Title: Re: Any chevy techs on here?
Post by: 74 SleekCraft on August 28, 2014, 06:17:21 PM

Oh and it only misses when it's at a idle.


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Title: Re: Any chevy techs on here?
Post by: rush1 on August 28, 2014, 06:33:25 PM

Is the check engine light on?  Probably needs a crank sensor

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Title: Re: Any chevy techs on here?
Post by: brchris on August 28, 2014, 06:34:23 PM

If it's only #3 and you changed everything may be bad injector and cleans up with more pressure. Just my thought

big river chris

Title: Re: Any chevy techs on here?
Post by: 74 SleekCraft on August 28, 2014, 06:39:07 PM

Ya it's only #3. I'm gonna swap the injector with #1 and see if it changes the misfire to #1


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Title: Re: Any chevy techs on here?
Post by: ehren4919 on August 28, 2014, 07:56:42 PM

Also check your coil.. I had a bad coil to one of my plugs and misfired


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Title: Re: Any chevy techs on here?
Post by: GT Jets on August 28, 2014, 08:10:08 PM

Do you have a noid light? To test the circuit going to the injector... they only cost about $12....

Betting on a tired/plugged injector.

GT

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Title: Re: Any chevy techs on here?
Post by: uncleBOBBY on August 28, 2014, 08:29:11 PM

My best guess is a bad injector


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Title: Re: Any chevy techs on here?
Post by: 74 SleekCraft on August 28, 2014, 08:35:03 PM

Thanks for the advice. I switched injectors and the misfire followed the injector to cylinder one. So I'm on my way to autozone to pick one up. There not cheap for a flex fuel lol.


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Title: Re: Any chevy techs on here?
Post by: brchris on August 28, 2014, 09:44:31 PM

Lol i was right. First time for everything

big river chris

Title: Re: Any chevy techs on here?
Post by: 74 SleekCraft on August 28, 2014, 10:13:20 PM

Quote from: brchris on August 28, 2014, 09:44:31 PM

Lol i was right. First time for everything

big river chris

lol you were. I just changed it and no more misfire and no more service engine soon light.


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Title: Re: Any chevy techs on here?
Post by: brchris on August 28, 2014, 10:14:27 PM

Right on bro

big river chris