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#7 Misfire?

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Old Feb 24, 2008 | 06:26 PM
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Default #7 Misfire?
It doesn't do it all the time. Sometimes at idle or when taking off. Not all the time though. When I run it hard on the hwy and finally let off, my exhaust pops and bangs. What da hell? I've swapped plug and wire, any ideas?
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Old Feb 24, 2008 | 06:28 PM
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tried swapping coil packs to see if it follows?
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Old Feb 24, 2008 | 06:37 PM
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lol damn! That's my next move. De De DEE! I just keep hearing all about the bad #7 cylinder getting jacked up. Wondering if they were common concerns.
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Old Feb 24, 2008 | 06:47 PM
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what year is your TA and do you have an LS6 intake?
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Old Feb 24, 2008 | 06:53 PM
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can a 02 sensor being bad cause the back fire when you let off after you run it hard?
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Old Feb 24, 2008 | 10:49 PM
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It's a 99 and I guess I should have mentioned it has + 211,000 miles. lol No ls6 intake, stock ls1. As far as an O2 sensor causing it to backfire...IDK. Noticed it started to do that when the #7 started missing. Of course all of this after I had my heads removed and did a valve job with new seats. Maybe I should get new heads? lol
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Old Feb 25, 2008 | 12:10 PM
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Another option....

Pull the #7 plug.... see if she appears to be "oilly" LSx motors have a substancial blow by... puddles in the intake and appears to hang around #7... just a thought.
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Old Feb 25, 2008 | 12:27 PM
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Whats the fix for this. I have a 2000 TA w/ LS1 intake and have misfire issues. I am thinking that fixing this might be my next step. Would getting the LS6 intake help this?

Tim
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Old Feb 25, 2008 | 12:40 PM
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If you are referring to the possibility that I posted.... run a catch can
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