Question about 1999 Chevrolet Silverado 1500

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No spark on passenger side cylinders on a 1999 Silverado 5.3 L.

ECM and coil packs have been replaced as well as the coil pack wiring harness. Not sure what to check next.

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I came across an issue like this before it ended being the crank shaft sensor

Posted on Nov 27, 2019

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Check an clean the ground on the head that is not firing

Posted on Oct 02, 2014

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Posted on Jan 02, 2017

Anonymous

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SOURCE: Cylinder misfire #5.Checked spark on cylinders 5

You got it, bad coil.

Posted on Dec 02, 2009

Testimonial: "Thank you.Could moisture on the coil pack have caused this problem as it has gotten colder of late?"

Jonah Oneal

  • 14092 Answers

SOURCE: Code P0300 misfired detected. I have cylinder 1

sound like bad ignition module.make sure where coil pack set in module contacts is clean and making good contact.also make sure plugs and wires is good.

Posted on Jan 09, 2010

Geoff Walton

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SOURCE: I have a 2002 TrailBlazer with the straight

did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

Posted on Feb 28, 2010

Anonymous

  • 81 Answers

SOURCE: coil pack

most new trucks have no use for a coil pack but if yours has one it wouldnt be the problem it sounds like there water getting into the intake and flooding the the motor with water or a very big hole in the hose leading to the vacuum hoses is getting water in it :)

Posted on Mar 23, 2010

Bernie Goncalves

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SOURCE: hi i have a 1999 malibu w/randum misfireing

well since you have already eliminated some possible causes now try the ignition module its the plate underneath the coil pack it is not a coil because then it would be misfiring on both cylinders to the coil and 1 goes with 4if this does not solve your problem only one thing left a bad computer causing this problem if you use a scanner you will see it actually is detecting the misfire through the injectors and that means the injector drivers in the computer are worn out. i have seen this several times and when you replace the computer it will have to be reprogrammed by a chevy dealer because the anti theft will not allow it to start . hope this helps you.

Posted on Oct 30, 2010

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1 Answer

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Im changing the wires on my f150 4.2L v6 2wd. now im not sure what order my wires went. i tried to do it one at a time. but i did sumthin wrong, cause when i got to the last wires i needed a small wire and...


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