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Backfire and flames shooting out of my tailpipes....something wrong??

This is a discussion on Backfire and flames shooting out of my tailpipes....something wrong?? within the General Help forums, part of the LSx Technical Help Section category; Here is the deal. My car is a cam/header/ORY DD. 78k miles on it, cam and headers went on within ...

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    Senior Member Hurley711's Avatar
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    Backfire and flames shooting out of my tailpipes....something wrong??

    Here is the deal. My car is a cam/header/ORY DD. 78k miles on it, cam and headers went on within last 15k miles. Recently while driving I have gotten some backfire, it happens when I am crusing and decide to get on it real good. For instance if I am driving a consistent 70 MPH for 8-10 miles than I downshift into 3rd and ride it up to about 85-90, when I let off it backfires usually everytime. Friends of mine have been behind me twice and said flames shot out the back. WTF is going on here?

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    Slow'er'Ass Mr. Luos's Avatar
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    You need a tune.

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    Senior Member Hurley711's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    You need a tune.
    Is this usually a rich or lean situation?

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
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    Last tune was 12k-14k miles ago last year during cam install....tuned with LS1edit

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    Impounded
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    Red
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    rich,the unburnt fuel gets mixed with enough ox in the exhaust and bang

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
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    Any tuners near Philly?

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    Pathelogical Liar BlackLT1Z28's Avatar
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    Could be rich, but might be timing. Either the timing is off (retarted) and the A/F mixture isn't completely done burning by the time the exhaust valve sucks it all out and it finishes the combustion out in the exhaust, therefore the backfires and possible flames. Or it could be rich and not all the fuel is ignited in the cylinder and when the exhaust valve opens, the rest of the gas is sucked out and ignited later...but running that rich would usually cause running problems and I don't think you are running too rich.

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    Senior Member Hurley711's Avatar
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    just left a message with harris speed outside of philly here, i'll get them to tune it.

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    Mustangs in the mirrors 02Hawk's Avatar
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    harris is a great place heard nothing but good. and they have a dyno day comin up on the 29th i believe

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    Senior Member Hurley711's Avatar
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    Quote Originally Posted by 02Hawk View Post
    harris is a great place heard nothing but good. and they have a dyno day comin up on the 29th i believe
    what do they charge for the dyno day? How many pulls at what price?

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    Mustangs in the mirrors 02Hawk's Avatar
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    its 40 dollars for 3 pulls

    if you look in the eastern member section theres a thread on it with details

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    Senior Member Hurley711's Avatar
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    Quote Originally Posted by 02Hawk View Post
    its 40 dollars for 3 pulls

    if you look in the eastern member section theres a thread on it with details
    They get a solid crowd over there? I gotta get in for a tune, I am asssuming you get your dyno #'s with a full tune

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    Mustangs in the mirrors 02Hawk's Avatar
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    ya you should if its dyno tuned lol

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    UberTapping Friction Pimp Anthracis's Avatar
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    Definite Dyno tune needed. It should be fine after.

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
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    Could it be part of an exhaust leak?

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    PFM
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    Could be you have a spark plug wire melting into your headers causing misfires.

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    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
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    setting up an appt to get plugs changed and full dyno tune, chalking it up to good maintenance 14k miles after cam install

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    Member Rich L's Avatar
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    Quote Originally Posted by Hurley711 View Post
    Is this usually a rich or lean situation?
    Your running rich. Thats better than running lean.

    One question...

    Did you remove your cats? If so... you will have much more backfire.

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    What Would Earl Do? Vexzer's Avatar
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    Rich, lean, plug wires? All wrong IMO. Ever see the fire from a racer under deceleration? Basically -you don't care how it burns once it's outta the chamber. If your valves are ok, you're ok. If you don't have an exhaust leak under idle or acceleration its no concern. Tune for power.

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    PFM
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    Quote Originally Posted by Vexzer View Post
    Rich, lean, plug wires? All wrong IMO. Ever see the fire from a racer under deceleration? Basically -you don't care how it burns once it's outta the chamber. If your valves are ok, you're ok. If you don't have an exhaust leak under idle or acceleration its no concern. Tune for power.
    I don't know about that dude. I had a set of MSD 8.5s put on my car the other day and about 2 days later I started getting bacefires and I found on the #6 cylinder the plug wire had started melting into my header pipes. I moved it out of the way and I haven't had the trouble since. That #6 is always giving people trouble.

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