Oh Crap, UIM or Engine Failure?
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Oh Crap, UIM or Engine Failure?
Just got my 95 SE all back up to snuff. New ECM, struts, tires, brakes, alignment, etc.
Then today, it started sputtering and I just *barely* made it into my driveway. Now it'* hydrolocked I think. Cyl #3 is full of OIL (not antifreeze). Is this an UIM problem?
Then today, it started sputtering and I just *barely* made it into my driveway. Now it'* hydrolocked I think. Cyl #3 is full of OIL (not antifreeze). Is this an UIM problem?
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It was the UIM gasket
The plastic gasket was split around the area of the little pipe that comes out of the manifold. Replaced the whole UIM, cleaned injectors, throttle body, etc. Man was that nasty. Runs awesome now. Did I err by not replacing the head gaskets while I had it partially torn apart? What kind of life can I expect from the engine based on the somewhat limited facts I've put out this far? 50k more miles??
One other thing, we put Dexcool in it, although the old stuff was the green coolant. Will this be a problem? I would have used green stuff but my dad did it while I was away.
One other thing, we put Dexcool in it, although the old stuff was the green coolant. Will this be a problem? I would have used green stuff but my dad did it while I was away.
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First of all, the head gaskets rarely fail.
Secondly, I hope you changed the oil before your crank bearings and rods rust.
Third, I'm not a fan of dexcool, although some have switched. I hope you didn't mix them, though, otherwise flush immediately. They're not compatible. Did you use the improved UIM?
Secondly, I hope you changed the oil before your crank bearings and rods rust.
Third, I'm not a fan of dexcool, although some have switched. I hope you didn't mix them, though, otherwise flush immediately. They're not compatible. Did you use the improved UIM?
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From: Gilroy, California
95greense: Could I have your old UIM? I'll pay postage. You can use the shipping container the new one came in.
I'm sleeving them for members here who have failed UIMs.
I'm sleeving them for members here who have failed UIMs.
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From: Purgatory
Did you change the lower intake gaskets, too? If you run into this again, and you didn't change them, you should consider doing it. IMO, the lower intake gaskets are just as important to change as the lousy GM UIM.
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Originally Posted by willwren
First of all, the head gaskets rarely fail.
Secondly, I hope you changed the oil before your crank bearings and rods rust.
Third, I'm not a fan of dexcool, although some have switched. I hope you didn't mix them, though, otherwise flush immediately. They're not compatible. Did you use the improved UIM?
Secondly, I hope you changed the oil before your crank bearings and rods rust.
Third, I'm not a fan of dexcool, although some have switched. I hope you didn't mix them, though, otherwise flush immediately. They're not compatible. Did you use the improved UIM?
I too hope that the oil was changed when you did all of this work... And if so drive the car a few hundred miles and change the oil and filter again to get the remaining contaminents out of the crankcase...
I was using dex cool as well... I changed over to Prestone Longlife... But if you mixed the red and green, flush the system, and go with fresh Prestong longlife or make sure its dex cool with no green mixed in at all...
Also it would have been a very good idea to do the lower intake manifold gaskets while you were in there as they too are proned to failure with age...
There is actually an upgraded GM intake gasket set that can be used on the 3800 II... You wouls also need a new coolant bypass elbow as well..
Good Luck
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