Recent UIM/LIM repair...since low oil pressure..now knocks?! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-28-2006, 10:46 PM   #1
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Default Recent UIM/LIM repair...since low oil pressure..now knocks?!

not too long ago i had UIM LIM failure. THat has since been repaired. After the repair i obviously changed the oil after a few hundered miles. Like an idiot i bought an engine oil additive i hadn't used before. It seemed that the additive i bought went in thick but came out runny. I have sinced changed that oil out and put regular in. BUT the oil pressure still drops when the car warms up. Now just today my engine started knocking and the oil pressure woes continue. I noticed my car seemed a lil underpowered then i noticed the knock. I checked all the plugs hoping i just fouled one but no. Please can someone help me!? is this possible result of the UIM repair? if so it will be covered but otherwise i can't figure this out and REALLY can't afford another large $$ repair.
please please help!
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Old 03-28-2006, 10:55 PM   #2
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Default Re: Recent UIM/LIM repair...since low oil pressure..now knoc

Quote:
Originally Posted by orty
not too long ago i had UIM LIM failure. THat has since been repaired. After the repair i obviously changed the oil after a few hundered miles. Like an idiot i bought an engine oil additive i hadn't used before. It seemed that the additive i bought went in thick but came out runny. I have sinced changed that oil out and put regular in. BUT the oil pressure still drops when the car warms up. Now just today my engine started knocking and the oil pressure woes continue. I noticed my car seemed a lil underpowered then i noticed the knock. I checked all the plugs hoping i just fouled one but no. Please can someone help me!? is this possible result of the UIM repair? if so it will be covered but otherwise i can't figure this out and REALLY can't afford another large $$ repair.
please please help!

When water gets in your bearings bad things happen....speaking from first hand expierence.


what sorta oil pressure numbers are we talking about?
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Old 03-28-2006, 11:00 PM   #3
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well when the engine is cold...norm about midway then when it heats up it starts dropping and for a while it hovers above the low line (just before the red) while idling then goes up when i motor. Then when the car heats up completely it goes into the red when i stop....although it still runs fine...well it did until now it started knocking...i was gonna change the oil again to see if that would help...maybe switch to 5w30 but the knocking started today so now im worried. but yeah when the car is warm the pressure goes LOW then fluxes back to midway
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Old 03-29-2006, 09:31 AM   #4
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Change your oil again. NOW!!! If you're going to switch oil, rather than changing weight, switch to synthetic. The "better cleaning properties" might help some.

About 6 months after my UIM went, I lost the whole engine. Apparently, the repair was not done soon enough, and the coolant that got into the system had time to start it'* evil rot trick. The engine basically ate itself due to internal rust for about 6 months, and finally blew (taking the tranny out with it)

Get some good clean oil in there quick! Not sure how much it will help, but it can't hurt to get out whatever left over contaminants might still be in there.

Good luck, mn. I hope I am over reacting based on my own bad luck.
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Old 03-29-2006, 09:39 AM   #5
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If the engine is knocking, changing the oil is just more money spent on a losing battle. You are likely losing your engine.

The Gearheads are currently discussing the possibility of asking people to drop their oil pans after the failure, as the oil pan can hold over an inch of water below the drain plug and circulate it back through the engine.
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Old 03-29-2006, 09:42 AM   #6
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Quote:
Originally Posted by willwren
The Gearheads are currently discussing the possibility of asking people to drop their oil pans after the failure, as the oil pan can hold over an inch of water below the drain plug and circulate it back through the engine.
Actually..w/o measuring it looks to be 1/4 to a 1/2 inch. In reality..any significant amount is potentially bad.
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Old 03-29-2006, 11:03 AM   #7
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Quote:
Originally Posted by willwren
If the engine is knocking, changing the oil is just more money spent on a losing battle. You are likely losing your engine.

The Gearheads are currently discussing the possibility of asking people to drop their oil pans after the failure, as the oil pan can hold over an inch of water below the drain plug and circulate it back through the engine.
I'm up for that task! My oil pan gasket is leaking a tad bit. Will let ya all know about it sooner or later.
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Old 03-29-2006, 11:16 AM   #8
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Mike..see my comments here about oil pan gaskets

http://www.bonnevilleclub.com/forum/...ic.php?t=51372
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Old 03-29-2006, 02:14 PM   #9
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ok ..but i cant afford a new engine...nor a car right now...any other suggestions? i can easily change the oil to synthetic..but what kind 10w30 synthetic? please i dont want to lose my car...my rear drive hub went last fall...thus rebuilt tranny...then UIM/LIM this spring...the last thing i need is a new engine. Please please help
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Old 03-29-2006, 02:21 PM   #10
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Do you know of a reputable shop? If so ..stop on by and ask them about putting new bearings into the motor. Do this quickly. The best chance to do this is right away. No more running than necessary.
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