Question about 2000 Pontiac Firebird

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Water leak, trying to figure out if it is head or intake manifold casket. There is a flat ridge under the intake manifold and it has antifreeze on it and it is above the head casket, I was thinking this was a head casket and with the moter running I do not have any water spaying anywhere. Replaced water pump and hoses.

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  • Jesse Patton Jul 22, 2010

    I wish, water is leaking when I start the engine, compression has dropped according to dash panel from 62-65 avg to 58-60 avg, but you are correct this could still be a intake casket and not a head casket issue, I could do pressure check, but that would still leave me guessing and the antifreeze being on that ridge where the intake casket is has me confussed, Help!!

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Without checking the head with a pressure test anything is possible. do a compression check on the cylinders and see if you have high compression on a cylinder. If the head is cracked it will let water into the cylinder and cause high pressure. This is still true with a broken intake manifold gasket as well though depending where it is broken. It is possible that what you are seeing is blow back from the radiator over flow. You don't see any leaks when your stationary but if you drive it and then stop and check it you see the fluid. This could be a result of blow back from a loose radiator cap or bad over flow hose.

Posted on Jul 22, 2010

Testimonial: "Bought the manual a few years ago and I've done upper end rebuilds, but I was going to try to cheat and see if I could and not take off intake, Thx"

  • James Young Jul 22, 2010

    Seems that no matter which way you go your left with one thing for sure, your going to have to pull the intake to be sure and isolate the problem. Water in a Cylinder will cause increased pressure not less but a Cracked head on the other had will give you less compression. If your going to do this job yourself, I highly recommend you get a Haynes or Chilton's repair manual before proceeding. At this point based on what you have provided I would have to go with removing the manifold and heads and have them pressure checked to rule out cracks.

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