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  1. #1

    Default exhaust back fire need help!!!!!

    exhaust poping noise when down shifting at high rpm's i need help figuring out if it normal or i have problem in the engine?

  2. #2
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    Default

    We need more info such as year/make/model/engine/etc...
    Mike

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    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3
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    Welcome to the club Cheyenne. X2 on more info.

    Exhaust leaks upstream in the e system on any make model engine will cause backfiring from the exhaust pipe on deceleration...
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  4. #4

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    2006 chevy silverado LS 5.3 it has a flowmaster with a cat back exhaust

  5. #5
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    Check engine light or anything else???
    and do you have a muffler or stright pipe? also what kind of RPMS are you talking about?
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  6. #6

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    it has a muffler. it only does it when im going like 80 to 90 mphs and then i decelerate a little thats when i here that poping noise in the exhaust

  7. #7
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    But the RPMS? and are you just letting off or are you taking it out of OD and putting it into 3rd?? and most likely it is the excess fuel from suddenly letting off getting burnt in the exhaust piping.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  8. #8

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    i just let it of or sometimes when i have to hit the brake

  9. #9
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    Quote Originally Posted by cheyenne06 View Post
    2006 chevy silverado LS 5.3 it has a flowmaster with a cat back exhaust
    It's exhaust leaks somewhere between (the head to exhaust manifold gaskets, first possibility for a leak) all the way back to your last joint on the exhaust system. Start it up & listen from the front all the way back. If you can't hear them, feel for air escaping with your hand.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  10. #10
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    Quote Originally Posted by stephan View Post
    It's exhaust leaks somewhere between (the head to exhaust manifold gaskets, first possibility for a leak) all the way back to your last joint on the exhaust system. Start it up & listen from the front all the way back. If you can't hear them, feel for air escaping with your hand.
    X2! on that i was thinking downshifting. Also look VERY close at the exhaust manifolds and bolts since it is very commong for the bolts to break and or the manifolds to crack.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

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