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Old 09-26-2018, 10:10 PM   #77 (permalink)
Galane
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Join Date: Jul 2009
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The Nissan Joke Juke.

The mid 1990's when GM thought it was a great idea to run 16psi cooling systems at 195 degrees F or higher. For example a 1994 Buick Century V6. On top of that they used extra tight piston tolerances. If the engine gets the least bit overheated, the pistons swell, scuff and gall. The skirts bend inwards then the pistons rock and knock. That triggers the knock sensor into messing with the timing, making more knock and making the engine run hotter.

That over-temp also increased pressure, leading to intake manifold gasket leaks. Then GM had to make a service video telling their mechanics to stop using Scotchbrite pads to remove gasket residue because little bits of them would get into the engine and wreck it. GM didn't want to have to keep paying for an intake gasket repair followed soon after by replacing the whole engine. Saw that old video on Youtube a while back, can't find it now.
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