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LMC Truck



Username Post: 2016 3.6 VVT engine - better than previous years?        (Topic#346966)
letsbangout 
Contributor
Posts: 151

Reg: 11-29-11
09-03-17 02:38 PM - Post#2706602    

So this isn't a full-size SUV question, but this sub-forum seems like as good a place as any to ask. Older 2009 to 2015 3.6 VVT engines are known for premature wear on the timing chain, and loud ticking from the high-pressure injectors. Yet most other engines with timing chains and direct injection do not suffer from these symptoms. There is a TSB on the 2015s and below. Can anyone tell me if the 2016s were improved in any way?

I was considering a 2014 Buick Enclave with this engine, but the ticking bothers me immensely, because it would tend to mask any other problems in the top-end. The Buick also vibrated much more than what I would consider normal for an engine with 26k. We looked at a 2016 Acadia that was quiet as a mouse, so I'm wondering if they made improvements over the years?

http://www.revbase.com/BBBMotor/TSb/Download Pdf?id...





 
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letsbangout 
Contributor
Posts: 151

Reg: 11-29-11
09-03-17 03:49 PM - Post#2706610    
    In response to letsbangout

The more I read, the more disappointed I get. Apparently these engines, even 2016s, suffer from bad rod bushings and loose wrist pins.

https://gm.oemdtc.com/5541/ticking-tap-or-r attle-n...



 
1983G20Van 
Super Senior Member
Posts: 3652

Loc: Bedford, Texas, USA
Reg: 11-13-02
10-07-17 01:54 PM - Post#2710072    
    In response to letsbangout

  • letsbangout Said:
So this isn't a full-size SUV question, but this sub-forum seems like as good a place as any to ask. Older 2009 to 2015 3.6 VVT engines are known for premature wear on the timing chain, and loud ticking from the high-pressure injectors. Yet most other engines with timing chains and direct injection do not suffer from these symptoms. There is a TSB on the 2015s and below. Can anyone tell me if the 2016s were improved in any way?

I was considering a 2014 Buick Enclave with this engine, but the ticking bothers me immensely, because it would tend to mask any other problems in the top-end. The Buick also vibrated much more than what I would consider normal for an engine with 26k. We looked at a 2016 Acadia that was quiet as a mouse, so I'm wondering if they made improvements over the years?

http://www.revbase.com/BBBMotor/TSb/Download Pdf?id...





I have NEVER heard of a direct injection engine with a quiet fuel system. They all tick. It is just the nature of the beast when you have a pump making 2,000+ PSI fuel pressure and have fuel injectors strong enough to open against the pressure. My M56S Infiniti has very noticeable ticking and even what I would describe as a clattering sound and it is 100% normal.

My sisters 2014 Silverado and her bodyfriends 2014 Sierra sound very similar.

My uncle has a new Sierra with the 6.2 and it sounds the same.

The 2017 Nissan Titan/Armada and Pathfinders all have a distinct ticking noise as well.

I have also noticed similar noise from the Hyundai/Kia engines that have DI.


1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 10-07-17 01:55 PM. Reason for edit: No reason given.

 
Shepherd 
Contributor
Posts: 975

Loc: Lake George, NY
Reg: 11-11-15
10-07-17 05:48 PM - Post#2710090    
    In response to 1983G20Van

For what is worth my 2015 Malibu is quiet even with the hood open. More of an issue is deposit build up on the intake valves as they are no longer exposed to fuel flow.



 
1983G20Van 
Super Senior Member
Posts: 3652

Loc: Bedford, Texas, USA
Reg: 11-13-02
10-14-17 07:43 AM - Post#2710827    
    In response to Shepherd

  • Shepherd Said:
For what is worth my 2015 Malibu is quiet even with the hood open. More of an issue is deposit build up on the intake valves as they are no longer exposed to fuel flow.



That is no joke either! I pulled the intake manifold on my 2011 M56S at 90K and cleaned the intake valves and ports using crushed walnut media blasting and B12 carb cleaner. Difference was night and day. I had tried two chemical cleaners through the PCV ports before I ended up pulling the intake. It cleaned the intake ports on the front 4 cylinders and deposited all that gunk directly on top of the intake valves as a messy gooey gummy deposit.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
Shepherd 
Contributor
Posts: 975

Loc: Lake George, NY
Reg: 11-11-15
10-14-17 10:04 AM - Post#2710839    
    In response to 1983G20Van

Hell of a thing to look forward to with all the direct injection engines out there!! I did the Seafoam process through the throttle body at 15k on my Malibu, no way to ascertain the results. It has plenty of power as of now, 100k engine warranty won't cover this!



 
someotherguy 
Moderator
Posts: 28432
someotherguy
Age: 47
Loc: Texas
Reg: 08-01-03
10-14-17 10:10 AM - Post#2710841    
    In response to Shepherd

The local "car talk radio show" guys here recommend regular cleanings with the BG tool that hooks to the fuel rail. They assert that if you start it before buildup happens, and repeat it regularly, that you can keep the buildup away. Whether or not that method stands the test of time, I guess we'll see!

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
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