For those who mod....
Just a word of caution to those who are modifying your camaro's...whether it be the LS3, L99 or the LSA....
REPLACE THE OIL PUMP!:mad0259: Dont assume GM has fixed it....because they havent. My pressure relief valve stuck at 9000 miles, and my motor is trashed. On the bright side, time for an upgrade :thumbup:. |
yup Lethal put the Melling in mine at 1500 miles with the Cam and heads.
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Do What? I have not heard of this.Is this a big problem? I thought I have read just about every post on this site and I did not see anything about an oil pump problem. :confused0068::confused0068:
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Is this the Melling 10296 pump?
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When i was doing a cam swap, Texas Speed said there is no reason to replace. They said it was a great pump.
I have read it has more to do with gunk causing the spring stick. OP what oil, oil filter, and intervals do you go for? |
wait the pressure relief valve is in the oil pan if im not mistaken and has nothing to do wth the oil pump? Also this happened to a friend of mine on his brand new ZL1, he trashed two motors before knowing what the problem was.
I Killed a rod bearing on my 427 truck a few days ago as well because oil pressure was fluctuating like anything, which im assuming is due to the pressure relief valve acting up, im blocking the valve and should be good. What im not sure about is how to verify if its the valve in the oil pan or the valve in the oil pump thats acting up? So for those looking for a fix, BLOCK THE VALVE. |
Here's a PI from GM that lists a slew of engines that can have this problem and it states to replace the oil pump.
#PIP4158D: Low Oil Pump Pressure Due To Sticking Oil Pressure Relief Valve- (Jan 18, 2012) Subject: Low Oil Pump Pressure Due To Sticking Oil Pressure Relief Valve Models: 2008 - 2009 Buick Lacrosse, Allure (Canada Only) 2007 - 2012 Cadillac CTS-V, Escalade 2007 - 2012 Chevrolet Avalanche, Corvette, Silverado, Suburban, Tahoe 2007 Chevrolet Monte Carlo SS 2007 - 2009 Chevrolet Impala SS, Trail Blazer 2009 - 2012 Chevrolet Colorado 2007 - 2012 GMC Envoy, Sierra, Yukon 2009 - 2012 GMC Canyon 2008 - 2010 Hummer H2 2008 - 2010 H3 Alpha 2008 Pontiac Grand Prix GXP 2008 - 2010 Pontiac G8 GT 2007 - 2009 Saab 97x With the Following Aluminum V8 Engine RPOs: L76, L77, L92, L94, L99, L9H, LC9, LH6, LH8, LH9, LS2, LS3, LS4, LS7, LS9, LSA, LZ1   This PI was superseded to update model and model years. Please discard PIP4158C.  The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern: Some customers may complain of low oil pressure, no oil pressure, and/or engine noise, which may be the result of a sticking oil pump pressure relief valve. In some instances, this may occur intermittently if the valve frees up when the engine cools down. Recommendation/Instructions: If SI diagnosis isolates low mechanical oil pressure at the oil filter housing and oil pressure sensor, replace the oil pump, flush the oil cooler lines (if equipped), Clean the inside of the oil pan, change the oil and filter, and re-evaluate the concern. Notice: If an engine noise is noticed after replacing the oil pump, follow the SI diagnosis and repair the engine as necessary. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.  WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION |
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Was using mobil 1 oil 5w30 / oem filter Another thing to look at is the melling pump is what...150 bucks? I would much rather have spent the 150 dollars than have to spend the thousands of dollars I have to pay now to fix the motor. |
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Btw have the shop also look at the valve in the oil pan, its another one thats notorious for getting stuck. which makes me think, I wonder if the SLP pump I had on my truck is simply a modified factory pump or what exactly... found this: http://forum.grrrr8.net/showthread.php?t=33532 |
Sorry to hear about that man. Thanks for posting this though, I had no idea the ZL1's had bad oil pumps.
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This is the kind of stuff that just pisses me off.....and just about destroys my faith in a product I have been fiercely loyal to over the years (GM)....I manage our company fleet in addition to buying my personal vehicles and have bought many dozens of Chevrolets...
I dropped a bunch of $ modding my ZL1.....and, thanks to the good people on this Forum, now discover a potential deadly issue on a car I have $75K+ invested in....and no factory recall on the part.....I have to discover it for myself on an Internet message board.....UFB....and, IMO, a disgrace to GM for their could care less attitude toward their customers.... Makes me wonder just what kind of pre-release "testing" their engineering staff did on this model....seems the issue should have cropped up before now? Sad..... |
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