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Missfire when A/C is running

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Old Sep 2, 2008 | 01:05 PM
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Default Missfire when A/C is running

My 02' LS1 missfires when I put the AC on. I can hear some weird noise by the drivers side of the motor. Plugs and wires were replaced months ago, as well as O2 sensors. Not throwing any codes. Any ideas?
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Old Sep 2, 2008 | 01:54 PM
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Is the running hot when you have the a/c on?
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Old Sep 2, 2008 | 03:07 PM
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possibly a bad ac compressor.
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Old Sep 2, 2008 | 03:15 PM
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It will happen when cold or hot. The noise sounds like a missfire only when it is happening and I feel the car lose some power.
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Old Sep 2, 2008 | 04:16 PM
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How does the a/c belt look? Can you smell burning clutch? The clutch on the a/c compressor might be locking up.
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Old Sep 2, 2008 | 05:26 PM
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Originally Posted by conan
How does the a/c belt look? Can you smell burning clutch? The clutch on the a/c compressor might be locking up.
I will take a look at that. Now that you mention the belt, I do hear it 'chirp' when letting up after hard acceleration. Hopefully that is it. Would it be possible to change the clutch only? Thanks!

Last edited by TedsB4Csled; Sep 2, 2008 at 05:57 PM.
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Old Sep 5, 2008 | 10:49 PM
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Check for a cracked plug. I had the same issue, it would miss slightly at idle and couldn't really tell until the AC was on then I could feel it missing even more. I hooked up HP Tuners and scan for misfires, which pointed to the #2 cylinder. I pulled the plug and sure enough the ceramic area was cracked. Replaced it and problem solved.
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Old Sep 6, 2008 | 09:55 AM
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Originally Posted by falcon5619
Check for a cracked plug. I had the same issue, it would miss slightly at idle and couldn't really tell until the AC was on then I could feel it missing even more. I hooked up HP Tuners and scan for misfires, which pointed to the #2 cylinder. I pulled the plug and sure enough the ceramic area was cracked. Replaced it and problem solved.
It's been fine without using the AC, but I wish I had access to HP Tuners or other software. That way I could be sure. I have checked most of the plugs. I found one that was cracked, but that was a few months ago. I can't get to 3 of them.
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Old Sep 6, 2008 | 10:32 AM
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Unplug the coil pack and remove from valve cover. it will help you get to some of the back plugs.
http://www.ls1howto.com/howto/fbody/...ecoilpacks.jpg
Dont unbolt each coil from bracket just the 5 bolts in this pick and all 4 coils will come out together.
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Old Sep 7, 2008 | 11:58 AM
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Originally Posted by conan
Unplug the coil pack and remove from valve cover. it will help you get to some of the back plugs.
http://www.ls1howto.com/howto/fbody/...ecoilpacks.jpg
Dont unbolt each coil from bracket just the 5 bolts in this pick and all 4 coils will come out together.
I unbolted one to get to some plugs. Never thought about all of them. Good idea, but I'm in a wheelchair so this makes things a little harder I will try again when it gets cooler.

Thanks again I appreciate the help.
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Old Feb 22, 2010 | 05:35 PM
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Turned out the AC was leaking out one of the lines off the compressor. Took the belt off for now. Don't need AC yet. lol.
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