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  1. #1
    Junior Member jrabbet's Avatar
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    Black
    1999 Z-28

    What to expect????

    Ive got a 99 Z 6 spd. with ALOT of mods. Went to start it Monday after a week and a half of siting and it starts and pops all at once. Now I got a window in the pan in line with #2 cylinder. I havent started tearing into it yet, The only thing I can figure is broke rod.. ganna try to get it out this weekend. Other than a leaky injector what could have caused it?

  2. #2
    Senior Member Redphoenix1998's Avatar
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    Red
    1998 Pontiac Trans Am

    bearings went bad?

  3. #3
    Junior Member jrabbet's Avatar
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    Black
    1999 Z-28

    5k on the engine. no noises at all in the past. broke when it fired first time..

  4. #4
    Senior Member Redphoenix1998's Avatar
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    Red
    1998 Pontiac Trans Am

    could be broken rod if #2 was hydrolocked but that's kind of hard to really do. You may just have to start tearing into it

  5. #5
    O U 8 1 2 Spaz's Avatar
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    []D [] []V[] []D
    1999 trans am

    fuel puddle would be my best guess...

  6. #6
    Junior Member jrabbet's Avatar
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    Black
    1999 Z-28

    Thanks guys, I will have it out this weekend.. Wish me luck

  7. #7
    Junior Member
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    silver
    1999 Z-28 camaro

    maybe a soft rod....if was a new one. had that happen on a race car before

  8. #8
    Member NoscamaroSS's Avatar
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    NBM
    2002 Camaro

    Have you had alot of rain lately?
    02 Camaro
    PRC Stg 2.5 5.3's, Futral F14, PP Typhoon intake, True duals, Performabuilt tranny, & 3500 convertor, HSW plate kit.
    *Old Time* 10.90@ 125mph

  9. #9
    Junior Member jrabbet's Avatar
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    Black
    1999 Z-28

    Yes, That is the reason for it sitting..

  10. #10
    Member NoscamaroSS's Avatar
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    NBM
    2002 Camaro

    Ive seen a couple of instances where water "rained down" on the motor from the cowl. Somehow the water made its way into the motor, im gonna assume around the intake gasket or possibly the injector o-rings, and when they are started, they pretty much immediately throw a rod.

  11. #11
    Junior Member jrabbet's Avatar
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    Black
    1999 Z-28

    The engine is dry. The only way it could get water on it is if it were to sweat

  12. #12
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    SOM
    1998 T.A.

    Get your injector for that cylinder checked. You wouldn't be the first one to break a rod from this........

  13. #13
    Junior Member jrabbet's Avatar
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    Black
    1999 Z-28

    Ok cool. I was hoping I wasnt the only one..

  14. #14
    Member c5z28's Avatar
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    On your ass flashing
    my highbeams

    Dr.Crash had that happen to him apparently, he might be able to help but you may have to e-mail him as he has not been on for awhile.

  15. #15
    402 Guru 402 Guru's Avatar
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    Red
    02 Trans Am T-tops M6

    +1

    Quote Originally Posted by Spaz View Post
    fuel puddle would be my best guess...
    +1 if you had a leaking injector it could dump raw fuel into your cylinder and have to much combustion and Pop a cylinder right in half ( Sounds like a gun shot is the only at to describe it )the only way to tell 100% is to start tearing the heads off and inspect the damage worst case that is and you have some cool lookin paper weight's like the notorious #7 cylinder on the ls1 that just go out of no where. Good luck with the Tear down give your self a weekend with some buds or do it yourself like i like to do then u have plenty of time not to rush , what kind of mods do you have ????
    Last edited by 402 Guru; 11-20-2009 at 06:26 PM.

  16. #16
    Junior Member jrabbet's Avatar
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    Black
    1999 Z-28

    Texas Speed 404 Stroker, Fast 92 intake and Nick Williams Throttle Body 95mm, Stage 2.5 heads, Futral Cam, Diamond pistons, ARP studs, Forged bottom end, Fast Toys lid, 1-5/8's AR headers, Fab 9 in w/full spool, 35 spline mosers, Chrome moly Drive Shaft, UMI safety loop, UMI Trq Arm, UMI Panhard Bar, FLSFC's, Hotchkiss springs, 5.0 short throw shifter, cartech level 7 clutch, Tick Master/Slave/Bleeder Kit, and a custom dyno tune by RPM

  17. #17
    Junior Member jrabbet's Avatar
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    Black
    1999 Z-28

    I run a restoration shop, so I have everything to do it myself, rushing wont be necessary.

  18. #18
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    SOM
    1998 T.A.

    Quote Originally Posted by un17real View Post
    +1 if you had a leaking injector it could dump raw fuel into your cylinder and have to much combustion and Pop a cylinder right in half ( Sounds like a gun shot is the only at to describe it )the only way to tell 100% is to start tearing the heads off and inspect the damage worst case that is and you have some cool lookin paper weight's like the notorious #7 cylinder on the ls1 that just go out of no where. Good luck with the Tear down give your self a weekend with some buds or do it yourself like i like to do then u have plenty of time not to rush , what kind of mods do you have ????

    It is not from too much combustion it is from the cylynder being so full of fuel that it will not compress so the rod breaks on the compression stroke......

  19. #19
    402 Guru 402 Guru's Avatar
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    Red
    02 Trans Am T-tops M6

    Thumbs up

    Quote Originally Posted by SOMbitch View Post
    It is not from too much combustion it is from the cylynder being so full of fuel that it will not compress so the rod breaks on the compression stroke......
    well i am engine builder for 15 years and it could very well be the rods or the piston its very hard to tell 100% unless you tear it down so we are both dead on
    Last edited by 402 Guru; 11-21-2009 at 11:49 AM. Reason: 100%

  20. #20
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    SOM
    1998 T.A.

    If it is a leaky injector I bet 10-1 it is the rod. Every case I have seen it has ALWAYS been the rod........

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