94 cutlass ciera s 3100 oil and water in EGR but not engine. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-13-2011, 01:16 PM   #1
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Default 94 cutlass ciera * 3100 oil and water in EGR but not engine.

Started missing 2 days ago but hasn't got any worse. Checked today and saw oil around the egr. Took off the egr and there is sludge oil/water mix. The recovery tank and engine are free off oil/water mix. The radiator has black sludge in it. Please tell me its a simple fix!
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Old 02-13-2011, 01:30 PM   #2
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I'm not as familiar with that engine, but if it'* anything like the GM 3800, there would be a gasket between the upper and lower intake manifolds. And if like the 3800 there are cooling passages right next to the EGR tube. when this gasket or UIM fails the coolant will leak in to the EGR and get in to the intake and can hydrolock the engine.
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Old 02-13-2011, 03:08 PM   #3
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We changed the gasket and cleaned the egr out. Im hoping since there was oil all over the outside of the egr it was just a failing gasket. Thats still doesn't explian why the oil/water was in the egr though.
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Old 02-13-2011, 03:10 PM   #4
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I just did a 3800 with a failed UIM, and found coolant in the EGR. Guess it'* where the leak is.
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Old 02-13-2011, 08:55 PM   #5
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UIM = Upper intake manifold?
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Old 02-13-2011, 09:00 PM   #6
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That is correct.
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Old 02-14-2011, 01:45 AM   #7
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Thats the one right on top of the engine right? Don't know much about this engine.
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Old 02-14-2011, 07:58 AM   #8
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Yes, the very top of the engine.
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