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Thread: backfiring out exhaust and intake manifold , choking up, loss of power

  1. #1
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    backfiring out exhaust and intake manifold , choking up, loss of power

    Hi guys names Cody jus joined and cant wait to get some opinions on this!! Its driving me crazy. Ok I bought a 95 chevy 1500 4.3 vortec v6. about 2 months ago and it was sitting for a while..the guy definately didnt maintain the truck very well. Sense i have had the truck I have done spark plugs and wires, fuel filter, fuel pressure reg, clutch, flywheel and starter, cap and rotor, pvc valve, And a glasspack exhaust 3". The truck will sit there and idle perfect after i start it. When I start it up though it usually blows the pvc elbow right off along with the vac hose near the fuel regulator and then i have to pop hood and reconnect them or it obviously runs like sh**..backfires in intake manifold and exhaust then idles nice lol. It has very little power when accelerating if any and chokes up occasionally when i hit the gas. Took it to mechanic and the guy pretty much told me had no clue..any ideas would b greatly appreciated !! I have spent so much money and none of the stuff i have done really helped this issue.

  2. #2
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    Re: backfiring out exhaust and intake manifold , choking up, loss of power

    Does it still have the cat on it??? It sounds like it's clogged up.
    Quote Originally Posted by neo71665 View Post
    Google searches can prove bigfoot is real and aliens from outer space are breeding with humans too.

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    Re: backfiring out exhaust and intake manifold , choking up, loss of power

    na no Cat I had the guy cut it off and put a glasspack and 3 " muffler ..very confused

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    Re: backfiring out exhaust and intake manifold , choking up, loss of power

    I hate it! Cant wait till my truck actually has power and doesnt choke up and backfire all the time,, frustrating

  5. #5
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    Re: backfiring out exhaust and intake manifold , choking up, loss of power

    Lets see... thinking out loud... You are building crank case pressure. What would cause that??? First thing is a clogged cat but you removed it.
    The next thing is a stuck valve or valves... Other things is a blown head gasket cracked head or block.
    Another thing is there is gas poring into the intake. When that happens it can explode inside when you first start it up blowing out the PVC valve and any loose hoses...
    Check the oil to see if any gas is mixed in it..
    Quote Originally Posted by neo71665 View Post
    Google searches can prove bigfoot is real and aliens from outer space are breeding with humans too.

  6. #6
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    Re: backfiring out exhaust and intake manifold , choking up, loss of power

    Yea when I smell it, it smells a little like gas

  7. #7
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    Re: backfiring out exhaust and intake manifold , choking up, loss of power

    and sometimes it smokes out exhaust when i start it up and then it goes away

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    Re: backfiring out exhaust and intake manifold , choking up, loss of power

    oO I hope not blown head gasket or anything bad!! wouldnt b good lol. engine sounds awesome when its just sitting there idling

  9. #9
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    Re: backfiring out exhaust and intake manifold , choking up, loss of power

    What injection system do you have. I know it's a 4.3 but full size I think is TBI.
    Quote Originally Posted by neo71665 View Post
    Google searches can prove bigfoot is real and aliens from outer space are breeding with humans too.

  10. #10
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    Re: backfiring out exhaust and intake manifold , choking up, loss of power

    I think 95 is the last year for cpi injection. so Im pretty sure its CPI

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