Question about 1997 Chevrolet Blazer
5.7's had all kinds of problems with intake manifolds but it could also be a head gasket leaking. One way to check is to pull out your spark plugs and have a look at them. One of them will should be really white looking, that is the cylinder where the coolant is leaking into. A good rule of thumb (but not always true) is that if the coolant is leaking into one of the cylinders at the very front or very back of the engine, it is an intake leak. If the coolant is leaking in one of the middle cylinders, it is a head leak.
But the only way to know absolutly for sure is to pull the intake off and look for a break in the gasket, if you see that you know its the intake manifold. If you cant see any signs of leakage its probally a head problem. Another word of advice, there is an updated gasket from fellpro that lasts longer that the OEM gasket.
Posted on Oct 11, 2008
Based upon my experence the fix is a new long block engine, but maybe not just yet. By that I don't mean a rebuilt nor a new short block. I have had 2 rebuilt engines installed in a Chevrolet Van. The first lasted 3 months and then exibited the problems you describe. The second rebuilt engine lasted 9 months. (Occured in Dallas) In both cases sealing the heads was the problem which allowed cooling water, under pressure to enter the cylinders, hence the Long block recommendation where the heads are installed at the GM factory. (I was a foreman at Oldsmobile)
In the mean time, as long as you are not totally depending on it, I say if it goes forward when you push the right pedal and stops when you push the left pedal (we're talking automatics here), yer good to go!! And, don't forget, rumors are just that. My current 1999 GMC Savana Vortec at 78000 miles is fine. -Fran
Posted on Oct 11, 2008
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