Intake Backfire
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Northstar Engines and System Technical Discussion Discussion, Intake Backfire in Cadillac Engine Technical Discussion; Recently, I had an intake backfire. The smoke that was under the hood was blue. I took the cover off, ...
  1. #1
    aamusls06's Avatar
    aamusls06 is offline Cadillac Owners Fanatic
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    Intake Backfire

    Recently, I had an intake backfire. The smoke that was under the hood was blue. I took the cover off, and found that it was a leaking FPR. I also replaced an injector that was leaking. I haven't seemed to find any cracks in the plastic intake parts under the cover.

    I put everything back together and now when I crank the car, it runs rich. I'm getting black smoke and raw gas from the tail pipes.

    I was thinking of starting with the ICM, because it had the same symptoms a few months ago from a failed ICM.

    Another funny thing.....I'm not getting in DTC's

    The car is a 1994 Caddy SLS with the N*.

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: Intake Backfire

    Raw gas in the exhaust is obviously a serious symptom of something very wrong in the fuel system......more than one bad injector, for starters......is the "new" one even working ??

    If the car continues to run this way for even a short time the piston rings will fail due to the oil film being washed off the cylinder walls and the catalytic convertor will fail also.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Intake Backfire

    Open it up and double check your work. Turn the key on to pressurize the fuel system, but DO NOT CRANK the engine. Look for leaks, especially at the FPR.

  5. #4
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Intake Backfire

    just touching the plastic fuel rail probably caused it to leak. The 93-94 fuel rails are made of the same material that was recalled on the 95-97 fuel rails because of leaks and fire hazard. The 93-94 was not recalled because it was not an external fire hazard. That doesn't mean it can't leak and hydrolock your engine with fuel. Sorry to say it has to come back apart!

  6. #5
    aamusls06's Avatar
    aamusls06 is offline Cadillac Owners Fanatic
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    Re: Intake Backfire

    I've been away for a moment, due to this insane load of course load here at school. I ordered another fuel rail. It's leaking around the injectors and around the fuel line.

    I've got two questions?

    The brass fitting does it fit inside the female end of the fuel rail that connects to the line? I

    Do they make a metal fuel rail for the 94? I was quoted 424.00 for a new one, which is a little steep for a college student.

  7. #6
    aamusls06's Avatar
    aamusls06 is offline Cadillac Owners Fanatic
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    Re: Intake Backfire

    Oh yeah, you guys hit the nail right on the head to check for leaking fuel inside the intake.

  8. #7
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Intake Backfire

    Not sure if they make a metal rail for the '93/'94. You'll have to check around.

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