Question about 1999 Pontiac Firebird

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I have the crappy Fireturd intake manifold issue...possible blown engine

I have a 1999 pontiac firebird with the intake manifold issue. Replaced the radiator 2 years ago (filled with sludge)... about a month ago noticed the sludge was coming back, and noticed telltale signs that the head gasket might be leaking.
I let my car sit in the driveway for about a week, knowing that it had a manifold or head gasket leak, as I was losing anti-freeze and the last time I started it it was making a ticking noise when it first started up that would go away, I was assuming that was the water that might have been in the piston area. But I decided I better fix the gasket problem before it gets any worse, so
I was going to drive my car from my driveway to my garage so I could replace the intake manifold gasket and head gasket if necessary, However, after trying to start it I heard a Loud BOOM, immediatly shut the engine off, I'm currently crossing my fingers that when I get the spark plugs out that all cylinders have compression, I'm assuming that was the sound of hydrolock and the rod breaking, If its a blown rod, what used engine should I replace it with... there are several online ones...
Thanks for any help...

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  • 2 more comments 
  • Anonymous Jan 06, 2009

    How to remove the engine of 1999 Firebird

  • Anonymous Mar 19, 2014

    I was thinking maybe a intake manifold gasket, and hoping not a head gasket. While driving can occasionally smell fuel. Now car has sputtering, and lack of power with accell. I have not owned the car long. I can see brown sludge in my radiator, I am assuming is maybe oil. I need to know where to start to fix the issue, as I need to use this car on a daily basis. Any ideas? Car is a '96 Firebird, 3.8 ltr, 5 spd, 144k miles....

  • Anonymous Mar 24, 2014

    heads have been replaced due to leakage at guides on 2 different cyls, 1 int - 1 exh. tech thought this was the fix. he then noticed intake manifold flexing down on start up and flexing back up on shutdown, replaced intake says it doesn't do that anymore but still has backfire sound from intake on shutdown.

  • Anonymous Mar 31, 2014

    Got water pump fixed, still leaking water, found out head gasket out, now I hear knocking noise from engine.



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Selecting replacement engines- check for 5yr-50000 warranty, not knowing location, two known- spokane, wa. sacramento, ca. there are mail order establishment that offer these, just make sure of warranty cover replacement labor fort total time warranty is in time, also make sure that, if a problem is not cured, they will supply replacement engine-labor. remember it is your dollars, you should be in control

Posted on Oct 05, 2008


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