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  1. #1
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    Apr 2014
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    San Pablo, California, United
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    Corvette(s)
    1984 Red Crossfire Z51
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    Help Crazy Crossfire Problems

    When I got the car it had a small hesitation. After giving it a tune up. I discover little bit of water in the oil with a cracked head. Long story short now it has pro comp heads 190cc runners 63cc compression chambers. Lunati 280/290 .443"/.465" cam, lifters and timing chain, roller rocker arms, harden push rods, New injectors, diaphragms, cap, rotor, ign module, coil, TPS, MAP, O2, plugs, and wires.

    The problem: When you stomp on it say go form 10% throttle to about 70% it will back fire then take off. This problem is intermittent. More likely from a stop. But does happen when your cruising.

    The Next Problem: I though maybe the ECM was bad. So I bought a new remanufactured ECM popped my prom in it. And it won't start. While you start it the injectors wont pulse they just spray a continuous stream of fuel flooding the car. Swap the prom to the old ECM in and this doesn't happen. I thought maybe the remanufactured ECM was bad since I got it from ebay although it was unused. So I went to the local parts store and ordered a New remanufactured one and have the same problem.

  2. #2
    Member dougelam's Avatar
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    2002 Roadster
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    Did you swap the fuel chip along with the prom, I believe you did not see it when you took the prom cover off.

    2002 W/Borla Exhaust

  3. #3
    New Member
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    I only see a socket for the PROM where is the fuel chip? have a pic?

  4. #4
    Member dougelam's Avatar
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    I may be thinking of an earlyer model but I thought the first fuel injected engines used a prom and a fuel calibrator. Later years they combined them to a cal-pack.
    Found this on goggle
    http://www.corvairnut.com/Images/1227747.JPG

    fuel calibration on the left, PROM on the right

    2002 W/Borla Exhaust

  5. #5
    Member xfirez51's Avatar
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    With the changes you have made, what have you done to the calibration? Are u still running the stock ECM?

  6. #6
    Crazy Crossfire Problems GerryLP's Avatar
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    When you say backfire, do you mean from the throttle body or from the tail pipe? If throttle body, the backfire is caused by a lean condition. If from the tail pipe, it will likely be timing related.
    GerryLP

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