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Need help witha misfiring LS engine

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Old 03-04-2010, 11:38 AM
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Default Need help witha misfiring LS engine

fixed

Last edited by JDM kid; 09-02-2010 at 10:52 AM.
Old 03-04-2010, 11:55 AM
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Default Re: Need help witha misfiring LS engine

1) Check for voltage at injector clip 1.

2) Check for spark at plug 1.

3) Compression test the cylinders.
Old 03-04-2010, 01:59 PM
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Default Re: Need help witha misfiring LS engine

q

Last edited by JDM kid; 09-02-2010 at 10:52 AM.
Old 03-04-2010, 02:26 PM
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Default Re: Need help witha misfiring LS engine

3

Last edited by JDM kid; 09-02-2010 at 10:52 AM.
Old 03-04-2010, 02:50 PM
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Default Re: Need help witha misfiring LS engine

Well you keep cranking until you get the highest reading. 3 things cause misfire comp, spark, fuel. You can get the two wires with light bulb and plug it in the 1st cyl injector clip and see if its flashes. I think your comp is good. Its prob spark.
Old 03-04-2010, 03:36 PM
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Default Re: Need help witha misfiring LS engine

This is the correct way to do a compression test. If you did the test correctly, then cylinders 1 and 4 have low compression.
Old 03-04-2010, 05:49 PM
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Default Re: Need help witha misfiring LS engine

d

Last edited by JDM kid; 09-02-2010 at 10:53 AM.
Old 03-04-2010, 05:53 PM
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Default Re: Need help witha misfiring LS engine

Again, if you did the compression test correctly, cyls 1 and 4 are low.
Old 03-04-2010, 06:18 PM
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Default Re: Need help witha misfiring LS engine

if it flashes its getting a signal, its good there. Check if you have a right firing order. I heard before that cat might cause it, but i never had that prob so i dont know the symptoms.
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