Question about 1999 Chevrolet Suburban

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How do u no if u have a bad head gasket or blown intake on a 1997 chevy pickup 350 engine

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Easiest way to test the intake gasket is to get a can of starting fluid and spray it around the intake area while the vehicle is running. Be careful, starting fluid is extremely flammable! If you notice an accelleration, or de-celleration while spraying the starting fluid, you can pinpoint the leak from there.

If you have a bad head gasket, you will see a white mucky substance on your oil dipstick.

I hope this helps you, and I wish you luck on your repair.

Posted on May 10, 2009

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Since the symptoms are the same the only way is to have a machine shop check the cylinder for cracks, in most case though the gasket is the problem, but remember the head must be machined flat again as the problem is usually caused by the cylinder warping

Posted on May 10, 2009

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Are there any known problems of head gaskets on 1997 buick century


Aaron, there has been a few problems with head gaskets, the bigger problem was with the intake manifold gaskets.
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Ok i have a 99 chevy burban its a 5.7 litter half ton has a 350 vortec engine i have to put antifreez in it every otherday it is leaking from the tail pipe it smokes bad only when it starts what is wrong...


Any competent shop will tell you the same thing. You either have a leaking intake or head gasket. Testing will give the shop the information they need to make a repair recommendation.
First test should be a hydrocarbon test of the cooling system. If they find hydrocarbons there you can safely assume it's a head gasket in which case the intake gaskets are replaced during the job and become a non-issue. A cooling system pressure test, followed by a cylinder leakdown test may be necessary if the hydrocarbon test is inconclusive. Personally, I'd just do the head gaskets and not waste too many $ on testing that could go towards the actual work..

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What's the difference between a blown head gasket and a blown intake gasket?


The head gasket goes between the block and the head, and seals the combustion process, and cooling water, and (if oil is pumped obove the heads to valve components) oil pressure.

Intake gaskets seal between the intake manifold and the head, and seal against intake vacuum, and in many cases, coolant.

A badly blown head gasket will so destroy compression in the cylinder that you can hear uneven cranking as that cylinder comes up on compression, kind of a “whir, whir, WHIR, whir, whir, WHIR, whir” with the capitalized whir being the engine spinning much faster due to no compression holding the starter back.

You will never be able to hear a problem with an intake manifold gasket until the engine actually starts to fire and/or run.

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Milky substance on your dip stick indicates contamination in your engine oil, most likely coolant and that is an indication of head gasket, or intake gasket gone bad and coolant leaking into your oil system. Note that coolant in your engine oil is bad, coolant will corrode the internal engine's bearing causing you to replace or overhaul the engine. The engine not starting is most likely the result of being blown and will need to be replaced.
Thank you for using Fixya and god luck

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New head gasket gasket needed would be my first guesses. Sounds like vacuum from the intake stroke is sucking coolant around the gasket from the block on the intake stroke. How does the oil look?


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This is not a good thing. You have a gasket leaking somewhere (head gasket, intake gasket) or a cracked head or block possibly. Don't run it like this you will wreck the whole engine instead of just a gasket replacement. Still not easy or cheap but better than a new engine.

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