98 pontiac grand prix gt 3.8 engine problems - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-08-2011, 03:16 PM   #11
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Check the UIM. There are 2 coolant passages that go up to the throttle body, and the EGR goes between them. This area cracks and leaks. There are two ways to fix this. Replace the UIM, or block off the coolant passages. I tap the ports in the LIM and put 1/4" pipe plug in. Make those flush. I found if you pull the rubber from the gasket for those passages, fill with red RTV, and put 2 nickels there. It will seal real good. Put the UIM in place, snug it up. Wait about a hour, then torque down.
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Old 12-20-2011, 02:05 PM   #12
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I got water in different cylinder now
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Old 12-20-2011, 02:07 PM   #13
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I had the head redone & pressure check as well & still got water
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Old 12-20-2011, 05:23 PM   #14
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I even remaned the heads & still got hydro lock

Its is not in the same cylinders though any suggestions?
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