KDG LIM OH SH** WTH did I do..... HELP!!!!!!!!! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-26-2007, 11:00 PM   #1
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Default KDG LIM OH SH** WTH did I do..... HELP!!!!!!!!!

I am posting this in P&B because I know some of you were expecting to see vids of the performance of my ported LIM. I was hoping to be sitting here showing you WOT greatness....instead I have vids of WOT doom. I took her out for the hundred mile PCM learn and then decided to hit some back rods to test her out. I did WOT while it was still learning and believe me.....she moves(moved) and she moved fast. On the first post 100 mile test run I thought I heard something like a belt squeal in the 5500 RPM range so I thought i would try it again. This time near the top of the rpm range I thought I heard something like the valve train tapping .so I decided I better head for home. I was about 50 miles out from home at that point. Warning....grab your jockstraps....feels liked getting kicked when you here these.....

vid 1 hoping I make it home

[/img]

vid 2 of more ride home



vid 3 safe (or not) home in the garage......cover your privates.felt liked getting kicked in the balls when I heard this..



So HELP!! what do you all think. I took the belt off and played with some of the pulleys. Did that real quick and didn't notice anything as I wanted to get this posted ASAP.
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Old 03-26-2007, 11:07 PM   #2
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Wow, that would surely make me have to change my pants...in a bad way. I can't say exactly what that is since I have no experience with those kinds of sounds, but it doesn't sound like any pulley, and it'* not a bad HB that'* for sure (you already knew that). It'* past tapping. Sounds like some really bad knock. I'm sure you'll get a definite answer soon enough.
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Old 03-26-2007, 11:10 PM   #3
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i would not be running it anymore

does it sound like top and or bottom end? what did you all do exactly when you had it apart?
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Old 03-26-2007, 11:12 PM   #4
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Oh my. That sounds like a distinct bottom end knock. :(

Drain the oil yet?
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Old 03-26-2007, 11:19 PM   #5
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Default KDG LIM OH SH** WTH did I do..... HELP!!!!!!!!!

What I did: New LIM alum. gaskets, UPN UIM kit, cleaned out throttle body and MAF. Ported the LIM. Didn't drain oil but I checked dipstick though. Clean as can be. It sounds like it'* top end.like something is bouncing around the UIM. I know I shouldn't but will start it one last time and take some more vid.
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Old 03-26-2007, 11:19 PM   #6
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You lost your Bottom end. Im sorry.
That is a VERY distinctive knock. How is your oil pressure?
Drain the oil into a clean pan, and shine a bright light directly at it, do millions of little metalic particals light back up at you?
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Old 03-26-2007, 11:27 PM   #7
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Default KDG LIM OH SH** WTH did I do..... HELP!!!!!!!!!

oil presuure constant over 40
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Old 03-26-2007, 11:29 PM   #8
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Wow. You have some or one highly damaged rod bearing at the least, or atleast it sounds like, as that knocking is keeping up with engine rpms. A Tap tap tap tap, tapping at half of engine speed would be valve train IE lifter/spring.

Did you change your oil after working on the top end? Any ammount of coolant in the oil will destroy bearing surfaces in a hurry, sometimes even not running, just sitting contaminated.
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Old 03-26-2007, 11:32 PM   #9
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Default KDG LIM OH SH** WTH did I do..... HELP!!!!!!!!!

This is so wierd. Yeah, I changed oil, changed out cooloant to pretone dex compatible(did the flush). Started her up again and runs except for all the frickin noise. Will post last vid next......
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Old 03-26-2007, 11:33 PM   #10
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At this point I would hate to see the kind of damage inside that engine, even just removing the Oil pan could reveal alot.
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