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Old 03-16-2017, 06:49 AM   #51
muzzlebrake
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The original 5.3L Gen III engine was virtually bullet proof. It lasted way too long therefore Engineered Failure came about. GM never wanted gas vehicles to last for 300K miles. Hurts their sales. That and EPA mandates for fuel economy. GM did not do themselves a favor by adding AFM and VVT since they were way behind on technology for this. AFM and VVT has really hurt the reputation of that motor. European cars have perfected VVT adn AFM to a much better degree but they still have reliability issues. Too many moving parts I guess. GM could have just went with a smaller boosted or turbo'd motor and accomplished the same thing in fuel economy as well as maintaining necessary power kinda like Ford did with the eco boost. Ford beat GM to the front on this one although they still had their share of failure with the eco-boost system.

Here's some of what made that GEN III engine so good--
* 4.40-inch bore centers (like the original small-block)
* Six-bolt, cross-bolted main bearing caps
* Center main thrust bearing
* 9.24-inch deck height
* Four-bolt-per-cylinder head bolt pattern
* 0.842-inch lifter bores
* Distributorless, coil-near-plug ignition system

Although performance car engines have typically carried "LS" designations, truck engines built on this platform have been dubbed Vortec. In the beginning, they were generally distinguished by iron cylinder blocks and were offered in smaller displacements than car engines. Interestingly, a 5.7L Vortec "LS" engine has never been offered. Here's a quick rundown of the previous and current-production LS truck engines:
* 4.8L - The smallest-displacement LS engine (293 cu in); it uses an iron block with 3.78-inch bores and aluminum heads.
* 5.3L - The most common LS truck engine (327 cu in), it uses the same iron block with 3.78-inch bores as the 4.8L, but with a longer stroke , (3.62-inch)crank. Later versions equipped for Active Fuel Management. Manufactured with iron and aluminum cylinder blocks.
* 6.0L - Used primarily in 3/4-ton and 1-ton trucks, the 6.0L (364 cu in) uses an iron block (LY6) or aluminum block (L76) and aluminum heads, with provisions for Active Fuel Management; some equipped with variable valve timing.
* 6.2L - Commonly referred to by its L92 engine code, the 6.2L (376 cu in) engine uses an aluminum block and heads, and incorporates advanced technology including variable valve timing. The L92 is used primarily as a high-performance engine for the Cadillac Escalade and GMC Yukon Denali.

The 5.3L engine in the 2002 thru 2006 trucks could be easily modified at very little cost to produce around 420 bhp and over 400 ft lbs torque. Taint bad for a small block 327 naturally aspirated motor that would get great fuel economy. We call them Hemi Killers.

Last edited by muzzlebrake; 03-16-2017 at 06:53 AM..
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Old 03-16-2017, 08:25 AM   #52
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Sorry to hear the it quit on ya Timm. I had the same engine in my 08 Z-71. Started burning oil at about 75K. Started fouling my plugs so badly, I finally got rid of it and bought a Titan. Got 131K on it and never had one problem. Had the plugs changed at 120K and the mechanic said all of the plugs still looked perfect. I was a Chevy man all of my life. Buy my last two Z-71's did not get past 116K before I unloaded them. Never was a fan of Jap trucks until I owned the Titan. I'm staying with them now.
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Old 03-16-2017, 08:37 AM   #53
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Sorry to hear the it quit on ya Timm. I had the same engine in my 08 Z-71. Started burning oil at about 75K. Started fouling my plugs so badly, I finally got rid of it and bought a Titan. Got 131K on it and never had one problem. Had the plugs changed at 120K and the mechanic said all of the plugs still looked perfect. I was a Chevy man all of my life. Buy my last two Z-71's did not get past 116K before I unloaded them. Never was a fan of Jap trucks until I owned the Titan. I'm staying with them now.
I had looked a the Titan several times. Very nice trucks. I considered the Ford Eco boost as my next truck as well. Truck should be ready this Friday. Jasper claims in their video to have resolve the AFM issue by changing out the faulty lifter with a new and designed AFM lifter.
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Old 03-16-2017, 09:49 AM   #54
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I had looked a the Titan several times. Very nice trucks. I considered the Ford Eco boost as my next truck as well. Truck should be ready this Friday. Jasper claims in their video to have resolve the AFM issue by changing out the faulty lifter with a new and designed AFM lifter.
That's certainly good news. I loved the way my Z's road compared to the Titan. Z's rode like the wife's Lexus, Titan rides like a buckboard.
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Old 03-18-2017, 09:31 PM   #55
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Truck should be ready Monday
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Old 03-19-2017, 07:35 AM   #56
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I had looked a the Titan several times. Very nice trucks. I considered the Ford Eco boost as my next truck as well. Truck should be ready this Friday. Jasper claims in their video to have resolve the AFM issue by changing out the faulty lifter with a new and designed AFM lifter.
A lifter change will not stop the oil burning. It may stop the lifter failure by installing a lifter with travel limiter in it but it's not going to stop the oil coming back up across the rings. Remember that when those cylinders shut off the cylinder then becomes just an air pump with no combustion pressure to keep the rings expanded and scrap the oil down. Even the compression ring scraps oil during the power stroke. The crankcase pressure will cause the oil to blow by the rings and then out thru the exhaust valve and on down to the catalytic converter which over time can get clogged too. It starts off slow but as the rings get more and more carbon built up behind them, oil burning gets worse.
It can start happening at 20k miles or at 75k miles but sooner or later it will happen.
The other place GM engines start to use oil is at the valve seals. This is usually at high mileage where over time the valve seals have become hard and worn by the constant up/down of the valve stem. A valve job with Viton replacement seals can usually fix this. Ever notice that after sitting over night and when you first crank it up the next morning a puff of blue smoke out the exhaust. That's most likely worn valve seals where the oil sitting on top of the valve stem seal drains down to the top of the valve guide as the engine cools and parts shrink and when it's started cold it sucks the oil down into the cylinder and burns it. It's not a lot but can amount to a quart every 500 to 1000 miles and then gets worse.

Last edited by muzzlebrake; 03-19-2017 at 07:37 AM..
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Old 03-19-2017, 09:12 AM   #57
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Originally Posted by muzzlebrake View Post
A lifter change will not stop the oil burning. It may stop the lifter failure by installing a lifter with travel limiter in it but it's not going to stop the oil coming back up across the rings. Remember that when those cylinders shut off the cylinder then becomes just an air pump with no combustion pressure to keep the rings expanded and scrap the oil down. Even the compression ring scraps oil during the power stroke. The crankcase pressure will cause the oil to blow by the rings and then out thru the exhaust valve and on down to the catalytic converter which over time can get clogged too. It starts off slow but as the rings get more and more carbon built up behind them, oil burning gets worse.
It can start happening at 20k miles or at 75k miles but sooner or later it will happen.
The other place GM engines start to use oil is at the valve seals. This is usually at high mileage where over time the valve seals have become hard and worn by the constant up/down of the valve stem. A valve job with Viton replacement seals can usually fix this. Ever notice that after sitting over night and when you first crank it up the next morning a puff of blue smoke out the exhaust. That's most likely worn valve seals where the oil sitting on top of the valve stem seal drains down to the top of the valve guide as the engine cools and parts shrink and when it's started cold it sucks the oil down into the cylinder and burns it. It's not a lot but can amount to a quart every 500 to 1000 miles and then gets worse.


I am still planning on getting the diablo tuner and turning off the AFM
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Old 03-19-2017, 09:45 AM   #58
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I am still planning on getting the diablo tuner and turning off the AFM
You won't regret it. Your fuel mileage should improve too. Maybe as much as 2 mpg.
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Old 03-19-2017, 11:30 AM   #59
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You won't regret it. Your fuel mileage should improve too. Maybe as much as 2 mpg.


I wouldn't count on it. I saw ZERO mileage gains when I put a Diablo on my 2004.

But my main reason for getting it was to adjust shift points and speedometer since the tires were slightly larger than stock. It did make the throttle response more snappy which was nice.


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Old 03-20-2017, 06:18 PM   #60
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Truck is ready!!
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Old 03-20-2017, 06:53 PM   #61
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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.


http://discussions.texasbowhunter.co...highlight=Ride
the 100k mile warranty sounds good, but ask if the warranty covers parts AND labor. if you buy the engine from one place and have it installed at another, the labor is probably not covered. if the engine goes bad, youll have to pay to have the engine pulled and re installed. and you can bet, if the engine goes bad, its gonna be the installers fault, and it aint gonna be covered!

I just had a refurb installed in my 02 z71. 3/36000 warranty parts and labor. also had all new belts, hoses, plugs, plug wires, sensors, water pump. so far, no issues.
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Old 03-20-2017, 09:15 PM   #62
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Runs like a champ! Tuner will be ordered this Friday
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Old 03-21-2017, 09:52 AM   #63
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the 100k mile warranty sounds good, but ask if the warranty covers parts AND labor. if you buy the engine from one place and have it installed at another, the labor is probably not covered. if the engine goes bad, youll have to pay to have the engine pulled and re installed. and you can bet, if the engine goes bad, its gonna be the installers fault, and it aint gonna be covered!

I just had a refurb installed in my 02 z71. 3/36000 warranty parts and labor. also had all new belts, hoses, plugs, plug wires, sensors, water pump. so far, no issues.

The shop added two year parts and labor for this job. I am good for two years at least. Jasper Engines is where the shop got my engine.
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Old 03-21-2017, 05:09 PM   #64
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Sounds like you got a good deal! Helluva lot cheaper than a new truck!
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Old 03-21-2017, 06:02 PM   #65
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Originally Posted by Mike D View Post
I wouldn't count on it. I saw ZERO mileage gains when I put a Diablo on my 2004.

But my main reason for getting it was to adjust shift points and speedometer since the tires were slightly larger than stock. It did make the throttle response more snappy which was nice.


Sent from my iPhone using Tapatalk Pro
Those bigger tires more than likely offset the mileage gains you might have gotten I sacrificed about 2mpg when I changed the tune and shift points and re-calibrated for my bigger tires. Pulling my boat is a lot easier on the truck with the shift points changed.
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Old 03-22-2017, 02:02 PM   #66
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Muzzlebrake you are an educated man.

You made this a nice read for me, thanks.

And I concur, get a tuner that will delete the AFM and roll on.

Or, find a guy that tunes with HP Tuner, or EFI live. Prolly about the same money and I believe you get a little better tune with the custom tune.

fwiw my 5.3 has over 320k never had an issue and I still drive it like I stole it.
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Old 03-22-2017, 02:13 PM   #67
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I've got a 2013. Any info on the newer engines
I heard they fixed the problem in 2012
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Old 03-22-2017, 09:03 PM   #68
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From what I read the issues was fixed in 2015.
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