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Lots of backfiring at idle....why??

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Old 05-29-2003, 12:50 AM
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Default Lots of backfiring at idle....why??

I get backfiring at idle and my Ltrims on bank 1 are -3%, on bank 2 they are 25% at idle. Why is this? I have leaned out the car some and I still get it. Any clues?
Old 05-29-2003, 06:56 AM
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Default Re: Lots of backfiring at idle....why??

I'm guessing it is either an exhaust leak or my intake isn't sealed properly. THat sound right?
Old 05-29-2003, 08:05 AM
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Default Re: Lots of backfiring at idle....why??

Mine did that when I blew the header gasket. FWIW
Old 05-29-2003, 08:46 AM
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Default Re: Lots of backfiring at idle....why??

I'm guessing it is either an exhaust leak or my intake isn't sealed properly. THat sound right?
could be, is this all the time or just when cold. throwing any codes?
Old 05-29-2003, 11:35 AM
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Default Re: Lots of backfiring at idle....why??

Could these symptoms be caused by a misfire on that side?
Old 05-29-2003, 12:27 PM
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Default Re: Lots of backfiring at idle....why??

Its not throwing any codes or any excessive misfires. I'll check the header gaskets.
Old 05-29-2003, 03:11 PM
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Default Re: Lots of backfiring at idle....why??

Do you have the coil pack harness reversed?
Old 05-29-2003, 04:20 PM
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Default Re: Lots of backfiring at idle....why??

Do you have the coil pack harness reversed?
No, I did have them reversed at one time, but that has been fixed. It doesn't pop like the coils are reversed, these are actual backfires and they aren't constant. I can rev it up to 2000 and it does fine. It backfires up high and at idle.




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