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Backfiring on deceleration no matter what i try?

Josh2010-08-12 02:09:32 +0000 #1
I get a backfire on deceleration no matter how much air i let it have. I blocked off part of the intake to richer it up.. stills backfires.. I just upgraded to the 3 inch intake, and did the stock exhaust mod around the same time. With the 3 inch intake it is a little lean. I checked the plugs to confirm this. Even with it being lean, I still have a backfire when the engine break is doing its thing. This is very annoying and I cannot figure out a remedy for it. It just backfires no matter what. Any help/advice is appreciated. thanks
HeadC12010-08-12 02:22:11 +0000 #2
The backfire is actually from so much air sucking in and less fuel when you let off. Its not a bad thing but if you don't like it try just rolling off the throttle slowly.
Josh2010-08-12 02:42:02 +0000 #3
Rolling off the throttle slowly works just fine.. no backfire at all. Which I ment to include in my first post. So i'm assuming their is nothing i can do about it? Its just very annoying
nmkawierider2010-08-12 03:12:52 +0000 #4
Usualy from being too lean and/or a leaking exhaust gasket.
Josh2010-08-12 03:12:32 +0000 #5
I richen it up to the point of no power.. which still results in a backfire on deceleration. I replaced my exhaust gaskets not long ago and i still get this annoying backfire.. Maybe i still have an exhaust leak but i don't hear one, nor can find one.
phreebsd2010-08-12 03:13:35 +0000 #6
You can easily fix that if you have EFI.

note the RPM range it happens at and richen that RPM range at 0% throttle.

(this is all assuming you have a power commander and 08+ brute)
Josh2010-08-12 02:31:43 +0000 #7
Yup 09 fi brute.. But no power commander yet. That's the next on the list. Guess i'm going to get that sooner than i expected
phreebsd2010-08-12 05:13:42 +0000 #8
i wish i could get a PCV with autotune.

that's what you'll end up with unless you find a cheap used PCIII and go with it instead.



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