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Old 03-14-2017, 02:34 PM   #1
2050z
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Default Getting a new engine for my 08 Silverado

Truck engine lasted almost five years. 160K miles and the #6 cylinder lifter has gone out. After a lot of research it's a known issue. GM won't cover the cost to fix this mess. AFM causes an oil consumption problem. Which in turn causes a whole bunch of other issues. My engine is 5.3L

I still love this truck so I am getting a refurbished engine with a 3 year / 100,000 mile warranty.


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Old 03-14-2017, 03:01 PM   #2
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My 08 5.3 motor lasted 50k til I had a motor put in it under warranty because this issue , you can get the afm tuned out I've been neeeding to do it on my new motor just haven't had time


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Old 03-14-2017, 03:04 PM   #3
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Im glad the older 5.3's are workhorses cause wifes got 280k on hers mines gotta buck50 and they both run flawlessly
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Old 03-14-2017, 03:25 PM   #4
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Quote:
Originally Posted by talleywack97 View Post
Im glad the older 5.3's are workhorses cause wifes got 280k on hers mines gotta buck50 and they both run flawlessly


My 99 4.8 z71 I sold with 260 and it never let me down it was on 35s and I was in highschool imagine how it was treated


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Old 03-14-2017, 03:26 PM   #5
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I've heard that this was an issue on some of them
Does it make any difference on what oil is used vs life of lifters ?
Sorry to hear it happened to yours
Hopefully your new engine will give many miles of use
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Old 03-14-2017, 03:28 PM   #6
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Sorry to hear brother. Im hoping mine lasts 3 more years

04 5.3l with 230k on it. I get a little nervous each trip to the deer lease.
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Old 03-14-2017, 03:36 PM   #7
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Be sure and have the AFM disabled or you will have oil consumption problems again sooner or later.
When there is no fuel into the cylinder during AFM the cylinder has no combustion pressure to keep the rings expanded. The cylinder is just acting like an air pump and will suck oil up past the rings on the intake stroke aided by the crankcase pressure. Probably one of the stupidest things GM ever did IMO. AFAIK the AFM is not a required part of your emissions system.
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Old 03-14-2017, 03:56 PM   #8
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Quote:
Originally Posted by ReydonPete View Post
I've heard that this was an issue on some of them
Does it make any difference on what oil is used vs life of lifters ?
Sorry to hear it happened to yours
Hopefully your new engine will give many miles of use
Regular oil changes with Mobil 1. Doesn't matter what the drivers used this AFM
is a piece of junk.

Several have mentioned getting a custom Tuner and turning it off.
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Old 03-14-2017, 04:03 PM   #9
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should I bought a Ford

that sucks but at least it didn't crap out on you Thursday morning

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Old 03-14-2017, 04:19 PM   #10
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Quote:
Originally Posted by bowhuntertex View Post
should I bought a Ford

that sucks but at least it didn't crap out on you Thursday morning

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So very true..... On not crapping out on my Thursday
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Old 03-14-2017, 04:27 PM   #11
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Went through this just before Christmas, but it was on an 08 with the 4.8l

I decided to replace it with a Ford.

Fwiw- I got $2500 for mine from a wrecker in its non running state
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Old 03-14-2017, 04:36 PM   #12
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I got lucky on my '10 with 4.8. Had it covered under warranty with just days left.

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Old 03-14-2017, 05:49 PM   #13
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Anybody have a tuner for an 08 Chevy?
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Old 03-14-2017, 05:59 PM   #14
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My 3 5.3L engines were great. However, I got rid of every one of them once they started to burn oil. All of them made it into the 160k area.
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Old 03-14-2017, 07:41 PM   #15
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Quote:
Originally Posted by 2050z View Post
Anybody have a tuner for an 08 Chevy?


Theres an afm delete called range, it basically just plugs in the obd port and your ready to go. If your looking for a tune ide look real hard at blackbear performance, all they do is gm vehicles and can really wake a 5.3 up.... that is what I got done on my 2014 with a 5.3
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Old 03-14-2017, 07:42 PM   #16
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Those engines without AFM that start using oil at high mileage is most likely due to the OEM valve seals getting hard and leaking. A good valve job and replacing the seals with VITON seals will bring it back to life for another 100K +
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Old 03-14-2017, 08:37 PM   #17
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How much is the warrantied re-furb engine installed? I have an 09 Z71 that seems to be headed this way. 203k on it.
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Old 03-14-2017, 09:19 PM   #18
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Default Getting a new engine for my 08 Silverado

3 year / 100,000 mile. Shop has a 2 year warranty on parts and labor

Last edited by 2050z; 03-14-2017 at 09:22 PM..
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Old 03-14-2017, 09:24 PM   #19
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What years had this issue, both 4.8 and 5.3?
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Old 03-15-2017, 05:52 AM   #20
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Quote:
Originally Posted by Texas276 View Post
What years had this issue, both 4.8 and 5.3?
Mainly the newer models with active fuel management.
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Old 03-15-2017, 06:00 AM   #21
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So what kind of money is a new engine?
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Old 03-15-2017, 06:14 AM   #22
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Quote:
Originally Posted by Hawkpuppy 1 View Post
So what kind of money is a new engine?


A lot

Jasper Engines.
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Old 03-15-2017, 06:33 AM   #23
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I bought a new truck in 2011 and six months out of warranty, 70K miles, valve job on one head. Trade in time?? I have put 10K since it was worked on.


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Old 03-15-2017, 07:16 AM   #24
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Had a 2011 5.3 that got a rebuild at 29k miles
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Old 03-15-2017, 07:20 AM   #25
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The weak link in the Gen III and Gen IV engines continues to be in the valve train. Engines with VVT and AFM are more prone to failures of the lifters.
2006 and earlier did not have VVT or AFM but there were some issues with the heat treating of the cam lobes and there were a good number of cams that would chip on the nose of the lobes. So many in fact that getting a stock replacement cam usually required a wait time as there were none in stock.
2003 thru 2005 5.3l engines were the worst. Variable valve timing and active fuel management both put uneven strain on the entire valve train as well as causing ring seal failure and oil consumption. It's what GM has done to meet fuel economy standards put in place by the smarter than everybody else tree hugger bureaucrats.
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Old 03-15-2017, 07:27 AM   #26
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I've got a 2013. Any info on the newer engines
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Old 03-15-2017, 07:32 AM   #27
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My 07 Tahoe with 5.3 started burning/losing oil at 140K. It got progressively worse until 240K when I lost #1 cyl. and #7 cyl. was beginning to fail as well. Jasper reman. engine went in. It was cheaper than new car payments. A little under two years and 60K miles later still going. A little left on the warranty. No complaints on the jasper. Fuel mileage has been less. I might look at the afm delete as well; I hadn't yet not wanting to void warranty. Just need to decide when to call it quits on this thing. Needing lower ball joints, struts/shocks, brakes and starting to notice a vibration in the driveline.
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Old 03-15-2017, 07:35 AM   #28
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Some mechanics feel that the cam lobe failures may have been due to the recommended oil viscosity 5w-20 was too thin and the use of full synthetic allowed the lifter roller to skate and bounce coming on and off the cam lobe ramp and chipping the cam lobe and sometimes the lifter roller. GM lifters are I believe manufactured and supplied by Delphi and Comp Cams made some of the OEM camshafts if not all.
Outsourcing of engines and engine parts is done by all car manufacturers to some extent and it's really hard to track down some of this stuff and where it came from, Japan, Korea, Taiwan, Mexico etc.
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Old 03-15-2017, 07:58 AM   #29
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Quote:
Originally Posted by 2050z View Post
Anybody have a tuner for an 08 Chevy?
Quote:
Originally Posted by Guerrero88 View Post
I've got a 2013. Any info on the newer engines
blackbearperformance.com, you would need to send them your pcm and have them tune it.

http://www.diablosport.com/sprint-ac...gement-module/ - this is just like the range device, plug in and drive, there does seem to be a slight battery drain with the range device but this one i am not sure.

http://www.diablosport.com/intune-i2...r-gm-vehicles/ - this one being the more expensive option, can disable the afm/dod and tune vehicle

the biggest problem with these engines is even the tune does not guarantee the afm lifters to not have issues. The lifters are the fail point since they have internal springs and seem to get clogged up over time and come apart. The only true way to rid the problem would be install regular lifters, and all the parts to support them ( about 1k in parts + labor) and turn the engine back into a true V8, you would also have to tune the PCM to rid the afm/dod once this is done. If and when this happens to my wife's tahoe, I will go this route. A good friend of mine does this conversion, and has done it to several vehicles with no issues after the conversion. It essentially converts the newer engines with afm/dod back to true V8 motors.
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Old 03-15-2017, 08:11 AM   #30
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sorry to hear the motor going out
I hit 250k on mine 2001 5.7
still going strong
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Old 03-15-2017, 08:29 AM   #31
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Dang that stinks! Sorry you're having to do this.

Dumb question of the day...Do all 5.3 Silverado trucks from those years have AFM??

I ask because I have 2010 Silverado 5.3 and I have never seen any indication of my truck having AFM. Does is say somewhere on the truck or when it kicks in?
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Old 03-15-2017, 08:33 AM   #32
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Quote:
Originally Posted by Tx.Fisher View Post
Dang that stinks! Sorry you're having to do this.

Dumb question of the day...Do all 5.3 Silverado trucks from those years have AFM??

I ask because I have 2010 Silverado 5.3 and I have never seen any indication of my truck having AFM. Does is say somewhere on the truck or when it kicks in?
I believe it does.
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Old 03-15-2017, 08:40 AM   #33
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Quote:
Originally Posted by Tx.Fisher View Post
Dang that stinks! Sorry you're having to do this.

Dumb question of the day...Do all 5.3 Silverado trucks from those years have AFM??

I ask because I have 2010 Silverado 5.3 and I have never seen any indication of my truck having AFM. Does is say somewhere on the truck or when it kicks in?
Read the owners manual, it will tell you if there is an indicator for when the AFM is active or not.

You can also run the VIN to see if it is equipped with VVT/AFM.
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Old 03-15-2017, 08:42 AM   #34
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Quote:
Originally Posted by mooney_ag View Post
My 07 Tahoe with 5.3 started burning/losing oil at 140K. It got progressively worse until 240K when I lost #1 cyl. and #7 cyl. was beginning to fail as well. Jasper reman. engine went in. It was cheaper than new car payments. A little under two years and 60K miles later still going. A little left on the warranty. No complaints on the jasper. Fuel mileage has been less. I might look at the afm delete as well; I hadn't yet not wanting to void warranty. Just need to decide when to call it quits on this thing. Needing lower ball joints, struts/shocks, brakes and starting to notice a vibration in the driveline.
How much lower gas mileage?

I haven't found any bad reviews after somebody disabled the DOD/AFM from their truck. I will keep looking on the forums for this engine.
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Old 03-15-2017, 08:56 AM   #35
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Quote:
Originally Posted by Tx.Fisher View Post
Dang that stinks! Sorry you're having to do this.

Dumb question of the day...Do all 5.3 Silverado trucks from those years have AFM??

I ask because I have 2010 Silverado 5.3 and I have never seen any indication of my truck having AFM. Does is say somewhere on the truck or when it kicks in?
On my 08, on the left part of the dash behind the steering wheel. The top button that looks like a highway will change your display on the speedometer and when I get to the one that says fuel economy, you can see the display while going down the road change from 8 cyl to 4 cyl.
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Old 03-15-2017, 09:03 AM   #36
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Default Getting a new engine for my 08 Silverado

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Old 03-15-2017, 10:07 AM   #37
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The old engine averaged around 17.7 mpg with 70% highway miles and 10% pulling trailers. I'm around 16.4 mpg on the life of the new engine with a similar ratio.
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Old 03-15-2017, 10:13 AM   #38
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Had to get a new engine in my 2009 z71 last year at 119k
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Old 03-15-2017, 10:33 AM   #39
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Common problem from what I was told .

Last edited by buckwild17; 03-15-2017 at 10:41 AM..
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Old 03-15-2017, 10:39 AM   #40
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My 2009 Z71 5.3 developed a flat spot on the cam at the # 2 cylinder . Not sure when it happened but kept a emissions code up that wouldn't clear and had rough idle because of it. . It used a quart of oil every 1000 miles from about 60,000 on till trade in at 165,000 this January right after the rear main started leaking . No more 5.3 for me !!
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Old 03-15-2017, 10:43 AM   #41
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Quote:
Originally Posted by 8pointer View Post
Had to get a new engine in my 2009 z71 last year at 119k
Where did you get yours done at? Mine is an 09 Z71 as well....
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Old 03-15-2017, 10:45 AM   #42
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Quote:
Originally Posted by buckwild17 View Post
My 2009 Z71 5.3 developed a flat spot on the cam at the # 2 cylinder . Not sure when it happened but kept a emissions code up that wouldn't clear and had rough idle because of it. . It used a quart of oil every 1000 miles from about 60,000 on till trade in at 165,000 this January right after the rear main started leaking . No more 5.3 for me !!
This sounds very much like mine. Runs fine, but idles a little rough when at a stop sign of stop light. Mine has been using some oil as of the last 2-3 oil changes. Didn't seem like mine started until about 190k. I have 203k on it now.....
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Old 03-15-2017, 10:50 AM   #43
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Dang Timm, sorry to hear this. Have not been on line lately. Glad you were somewhat close to home.
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Old 03-15-2017, 12:35 PM   #44
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Quote:
Originally Posted by muzzlebrake View Post
The weak link in the Gen III and Gen IV engines continues to be in the valve train. Engines with VVT and AFM are more prone to failures of the lifters.

2006 and earlier did not have VVT or AFM but there were some issues with the heat treating of the cam lobes and there were a good number of cams that would chip on the nose of the lobes. So many in fact that getting a stock replacement cam usually required a wait time as there were none in stock.

2003 thru 2005 5.3l engines were the worst. Variable valve timing and active fuel management both put uneven strain on the entire valve train as well as causing ring seal failure and oil consumption. It's what GM has done to meet fuel economy standards put in place by the smarter than everybody else tree hugger bureaucrats.


2003-2005 engines had VVT & AFM?

My son is driving my 04 Z71 5.3 and it has 236k miles in it with no issues at all. It doesn't even burn a full quart of oil between 5k mile oil changes.


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Old 03-15-2017, 01:00 PM   #45
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Quote:
Originally Posted by Mike D View Post
2003-2005 engines had VVT & AFM?

My son is driving my 04 Z71 5.3 and it has 236k miles in it with no issues at all. It doesn't even burn a full quart of oil between 5k mile oil changes.


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No, these engines did not to my knowledge. AFM started in 2007 and VVT was started in 2009 I believe. The newer trucks have both.
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Old 03-15-2017, 01:02 PM   #46
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Originally Posted by Bullydog View Post
Dang Timm, sorry to hear this. Have not been on line lately. Glad you were somewhat close to home.
If ya ever need a good mechanic I know one in Denison.
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Old 03-15-2017, 01:03 PM   #47
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Quote:
Originally Posted by KDinTX View Post
blackbearperformance.com, you would need to send them your pcm and have them tune it.

http://www.diablosport.com/sprint-ac...gement-module/ - this is just like the range device, plug in and drive, there does seem to be a slight battery drain with the range device but this one i am not sure.

http://www.diablosport.com/intune-i2...r-gm-vehicles/ - this one being the more expensive option, can disable the afm/dod and tune vehicle

the biggest problem with these engines is even the tune does not guarantee the afm lifters to not have issues. The lifters are the fail point since they have internal springs and seem to get clogged up over time and come apart. The only true way to rid the problem would be install regular lifters, and all the parts to support them ( about 1k in parts + labor) and turn the engine back into a true V8, you would also have to tune the PCM to rid the afm/dod once this is done. If and when this happens to my wife's tahoe, I will go this route. A good friend of mine does this conversion, and has done it to several vehicles with no issues after the conversion. It essentially converts the newer engines with afm/dod back to true V8 motors.
And believe it or not better fuel economy and more power everywhere. blame it all on the EPA mandates.
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Old 03-15-2017, 01:10 PM   #48
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Quote:
Originally Posted by Hawkpuppy 1 View Post
Where did you get yours done at? Mine is an 09 Z71 as well....
I ended up having to get it done at the chevy dealership in San Angelo. I didn't want to have it towed to San Antonio. It happened on a trip to the deer lease. I called several mechanics in town. I did not want to go the junkyard route or the rebuild. I decided to go with the gmc warranty that the dealership offered, which is 3 years 100k miles.

I will probably break down and buy a new truck in 2018
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Old 03-15-2017, 07:12 PM   #49
2050z
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Join Date: Oct 2006
Location: Way North of Dallas
Hunt In: Grayson when drawn/Coryell/Scio Ohio/Unit 11 Kansas
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Quote:
Originally Posted by 8pointer View Post
I ended up having to get it done at the chevy dealership in San Angelo. I didn't want to have it towed to San Antonio. It happened on a trip to the deer lease. I called several mechanics in town. I did not want to go the junkyard route or the rebuild. I decided to go with the gmc warranty that the dealership offered, which is 3 years 100k miles.

I will probably break down and buy a new truck in 2018


We called GM for a motor and they told us it was a 3 year / 100,000 warranty, but it was a rebuild. The kicker was they did not fix the issue on the rebuild.
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Old 03-15-2017, 07:43 PM   #50
MD2TX
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Join Date: Apr 2012
Location: Collin County
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My 08 started using about 2 quarts every 2500 miles. That truck was maintained religiously.. kinda upset me. traded it in immediately after I started researching it and hearing all the horror stories. Neighbor is a mechanic at a GMC dealer. He said if the oil consumption from the stuck piston rings don't get ya the AFM lifters collapsing or rounded cam will.. Sucks because the old generation 5.3 was a great engine.
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