Quote:
Originally posted by BonneFan
I agree the VIN K upper intake problem is a BIG problem and its due to the EGR inlet into the upper intake manifold failing , the corrective measure is a 180 T stat. In particular the 3800 pushrod engine is the best engine designed in recent GM history.
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With all due respect, a 180 thermostat won't make any difference whatsoever.
The exhaust stream leaving an engine at highway speed is 700 degrees celsius i believe. It's enough to make cast iron exhaust manifolds glow red and heats the EGR valve to such a point that GM has 1/8" thick piece of steel wrapped around the thing.
All this gets blasted into a piece of plastic.
Eventually, the plastic cracks from thermal fatigue and break down of the plastic material.
The obvious solution is an aluminum intake manifold again, but that costs a bit more money than a plastic one.
A cheap solution would be to pipe the EGR stream in at a different location, away from the throttle body water ports. Preferably through removable piece that can easily be replace, or better yet features a ceramic heat sync collar.
Will GM do this??
NO FREAKIN WAY.