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Old January 31st, 2013, 07:27 PM   #1
4x4zabriskie1991
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misfire on 2 4 6 and 8???????need help

need help

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i have a 99 chevy silverado 1500 with a 5.3L and i am getting a misfire on cylinders 2 4 6 and 8 its one hole bank and i have no idea whats going on with? i just dont want to have to keep money into it and not have it fix it if someone can point me in the right direction would be great or if this has happed to someone elce and could tell me how to fix the problem or what the problem is.i also was tld it could be the catalytic converter on that side??????
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Old January 31st, 2013, 07:34 PM   #2
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Got broken exhaust manifold bolts? Probably first and last one? = plugged converter forcing back pressure and misfire.
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Old January 31st, 2013, 07:40 PM   #3
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Intake gasket
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Old January 31st, 2013, 07:44 PM   #4
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woudnt that make a exhaust leak? and so your saying i still could have a plugged converter?
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Old January 31st, 2013, 07:52 PM   #5
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Take the oxygen sensor out on that side and hook a pressure gauge up to it. I don't exactly know what the pressure reading would be, but that's one test my buddy told me about. You could also take the pvc valve out and check if there is a shit load of blow by.
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Old January 31st, 2013, 08:55 PM   #6
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Have seen upstream o2 sensors fail and read lean. So the ecm will dump a bunch of fuel in that bank. Usually you will see black smoke out of the tail pipe, and you can smell the gas. It may not set a code. If you have a scan tool you can look at the o2 voltage and see if its switching from around 200-800mv. But you need a good scantool not a code reader. Good luck.
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Old January 31st, 2013, 09:00 PM   #7
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Not sure on the chevys but i worked on a jeep liberty and it had a shorted o2 sensor and it caused one whole bank to misfire or is could very well be a coil issuse on that side try swapping coil packs from one side to the other i think they r the same on both banks
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Old January 31st, 2013, 09:30 PM   #8
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thank you guys fo the answers looks lik i have a long day tomorrow but if there is anything elce i could do to fix my tuck plz do tell me
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Old January 31st, 2013, 09:41 PM   #9
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thank you guys fo the answers looks lik i have a long day tomorrow but if there is anything elce i could do to fix my tuck plz do tell me
Place on hoist, remove radiator cap, disassemble and scrap truck, place cap on a ford, drive.
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Old January 31st, 2013, 09:52 PM   #10
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coil packs are known to shit the bed on those. how does it run? does it run smooth at all or very rough all the time?
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Old January 31st, 2013, 10:06 PM   #11
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need help

--------------------------------------------------------------------------------

i have a 99 chevy silverado 1500 with a 5.3L and i am getting a misfire on cylinders 2 4 6 and 8 its one hole bank and i have no idea whats going on with? i just dont want to have to keep money into it and not have it fix it if someone can point me in the right direction would be great or if this has happed to someone elce and could tell me how to fix the problem or what the problem is.i also was tld it could be the catalytic converter on that side??????
had a 01 60 hd did the same thing it was the converter i pulled them off ran grate after that ..
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Old January 31st, 2013, 10:09 PM   #12
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it runs ok if that makes sence haha it runs smooth at times ad other times it run like shit but driving it haha it has no power at all
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Old January 31st, 2013, 10:19 PM   #13
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it runs ok if that makes sence haha it runs smooth at times ad other times it run like shit but driving it haha it has no power at all
cut the cats off ..
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Old January 31st, 2013, 10:45 PM   #14
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Place on hoist, remove radiator cap, disassemble and scrap truck, place cap on a ford, drive.
We used to say pull the key out and replace the key holder. In this case that would be foolish because he has a miss fire not a complete pile of shit like ford builds.
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Old January 31st, 2013, 10:47 PM   #15
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haha so true
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Old February 4th, 2013, 09:18 AM   #16
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just replied to your PM, my misfire was all on one bank also.
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Old February 4th, 2013, 10:14 AM   #17
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o2 sensor.
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Old February 5th, 2013, 08:22 AM   #18
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o2 sensor.
yeap
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Old February 5th, 2013, 08:26 AM   #19
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Intake gasket
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Got broken exhaust manifold bolts? Probably first and last one? = plugged converter forcing back pressure and misfire.
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Originally Posted by feva4u View Post
o2 sensor.
What they said.
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