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Thread: 6.2 Oil pump
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12-05-2012, 12:20 PM #1
6.2 Oil pump
Well, not even 6500 miles on my truck and we're replacing an oil pump. Apparently there were a few of these engines built in a certain time period that had faulty oil pumps from the factory. There was a gap between the casing and pump that was basically aerating the oil. This causes an air rush noise on initial start up, and a lifter tick.
Luckily GM put out a bulletin on this issue so we knew exactly what the issue was as soon as the tech heard the noise. I just hope there isn't any long term damage to the internals.
2018 Tahoe - Silver - OEM
2008 Z06 - Velocity Yellow - BBE exhuast - Airaid CAI **sold**
2002 Z06 - Electron Blue Metallic - D1 - E85 - 701 rwhp 687 rwtq **sold**
2002 Z28: M6 NBM - cam and boltons - 396rwhp 357 rwtq **sold**
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12-06-2012, 05:03 AM #2
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- ardmore oklahoma
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yellow- 2004 pontiac gto
i would make sure the dealer makes a note in the paperwork that if the engine fails prematurely it could be caused by the bad pump. make them stand behind the product.
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12-06-2012, 05:45 AM #3
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12-08-2012, 06:03 AM #4
- Join Date
- Oct 2012
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- ardmore oklahoma
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yellow- 2004 pontiac gto
well then you have it made then. heck get it modded by the dealer and you still get the warranty as long as you have them do the work. but i am sure you already know that too. but the dealerships do take advantage of the general public that do not know much about cars and trucks. i even have had to use the magnason act on the dealer i bought my gto from. they were going to cancel my warranty because i put on aftermarket exhaust. the whole cars warranty. i told them hell no you will not and showed them the magnason act law, and all was good.
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12-08-2012, 07:42 AM #5
Not all dealers are the same. Here, we deal with modified cars and trucks all the time. If it's a warranty concern it's a warranty concern... If it's the modification that causes the issue, then you're on your own.
We're very easy to deal with. But here in my area, there are a TON of GM dealers in a small radius, so we whatever it takes to keep our customers.
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12-09-2012, 11:30 AM #6
Wow, not something I would have expected on these new trucks, especially since the LS line of engines have been around since 97.
I know oil pumps were issues first couple years of production (97-98) but improvements and changes in design pretty much eliminated that throughout the following years. Surprised to hear of it on a brand spanking new vehicle.
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12-10-2012, 05:57 AM #7
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12-21-2012, 11:53 AM #8
Well the initial start up chug has gone away completely, but now I'm fighting with an internal tick somewhere. It isn't the normal LS tick either, it stays constant no matter engine or ambient temp. And it is RPM dependent. I think I have a bad lifter already. Probably caused by the faulty oil pump... I'm getting disappointed. But I think I'm going to use this as an excuse to throw in a very mild cam.
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12-22-2012, 08:13 AM #9
Isn't that a brand new truck? Not supposed to have these problems already.
Guess you should have bought a ford or chrysler.
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12-22-2012, 08:34 AM #10
You bite your tongue FBJ!!!!
It is brand new. I'm kinda pissed about it, but as long as it gets fixed then I think I'll be ok.
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12-22-2012, 12:30 PM #11
They need to put a new engine in that thing. If it's already showing signs of issues from the oil pump going out, then it's only going to get worse.
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12-23-2012, 10:48 AM #12
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12-23-2012, 03:59 PM #13
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02-02-2013, 08:18 AM #14
Well the saga continues... New noised arrived on cold starts and the engine tick never really fully went away. I had my shop take it in while I was in Daytona last week, and as of yesterday, I have a brand new 6.2 under my bonnet. The piston diameters were ALL under spec, and the cylinder walls were ALL over spec. We're talking thousandths of an inch but still kinda scary. No oil blow by, and the rings were all in great shape, but some of my connecter bearings were blued, and showing odd striations. Needless to say, GM wants that motor back to see WTF happened. And I get a new one, which is all I wanted from the start.
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02-02-2013, 10:33 AM #15
Yeah thats a good thing. That motor's issues were never going to end, only get worse.
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02-03-2013, 06:56 AM #16
Agreed. I'm happy but now I have a new engine to break in and get about 8mpgs on for a couple months.
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02-03-2013, 11:30 AM #17
At least they fixed it the way they should have. Good news in that regard.
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03-22-2013, 06:15 AM #18
- Join Date
- Aug 2009
- Location
- Ky
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Red- 2011 Silverado 6.2
Konigandy6, if you don't mind me asking is there some way I can obtain a copy of the bulletin or is there a TSB for the issue? I have a 2011 that makes pretty significant knock upon initial start up and has what sounds like a lifter tick all of the time.
Thanks,
Matt
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03-23-2013, 10:43 AM #19
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- Apr 2008
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- Madison, WI
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- 7,006
1999 Formula WS6 M6-sold- 2001 Silverado Z71
-------------------------------------Kooks 1 7/8" race headers, Kooks ORY, Borla catback, Nitto 555R, LS6 intake manifold, Shaner S3 ported stock throttle body, SLP lid, smooth bellows, JAAM Ram Air kit, Elite Engineering catch can, LS6 valley cover, EGR and AIR deleted, Frost tune, and Simpson Racing child car seat in the back. 13.2 @ 108MPH
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03-25-2013, 12:53 PM #20
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- Aug 2009
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- Ky
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Red- 2011 Silverado 6.2
Thanks for the link it was very helpful.
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