Overheated while driving....Now it hesitates, shakes & has a rough idle. on 1995 Jeep Grand Cherokee

I was driving on the highway, it was very low on water, over heating badly but I continued to drive to my destination for oil change & radiator flush at my uncles garage. Now it shakes and hesitates while driving, idling. Is there engine damage? Would changing the spark plugs stop the hesitation? Is the head gasket blown? Is the engine warped? What damage could the overheating cause? I'm scared to drive it, especially long distance now.

by in New Philadelphia, OH on November 27, 2011
2 answers
ANSWER by on November 28, 2011
I would suspect the cylinder head gasket may indeed have a problem. Does the engine still over heat or blow water or air bubbles out of the radiator when you start or run the engine for a short period of time? The most accurate way to test for a blown head gasket on a gasoline engine is to test for the presence of carbon monoxide in the cooling system. Snap-On, Matco (part # CO 2000), and Napa sell a tool to check to carry out this test. Another link to a supplier of this tool is http://www.etoolcart.com/combustion-leak-detector-lis75500.aspx. Carbon Monoxide is only present if there is a blown head gasket or cracked cylinder head. http://www.arrowheadradiator.com/head_gasket_or_combustion_leak_test.htm I think the Napa part number 700-1006. http://www.blockchek.com/instructions.htm . Signs of a blown head gasket are coolant loss (frequently have to top up the coolant level of the engine without seeing an obvious leak), experiencing over heating or rough engine running or the presence of white sweet smelling steam from the exhaust. A badly blown head gasket may allow engine coolant and oil to mix.
ANSWER by on January 30, 2012
Have engine scan or per form a leak down test.

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