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Have a 2011 Yukon Denali with 200K on it, that just started

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Have a 2011 Yukon Denali...
Have a 2011 Yukon Denali with 200K on it, that just started making a loud tapping sound coming from inside engine. Still running fine and no codes have been set. oil pressure is fine. and looks good. as do all fluids. Had to drive it home about 20 miles after it began but is now parked and trying to figure out where to take it and what I am probably looking at for repair.
Submitted: 1 year ago.Category: GMC
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Answered in 8 minutes by:
11/30/2015
GMC Mechanic: joeplow, ASE Certified Technician replied 1 year ago
joeplow
joeplow, ASE Certified Technician
Category: GMC
Satisfied Customers: 1,354
Experience: Have extensive experience since 1974,engines,ac, & Transmissions since1978
Verified

Ok , If its a Tap on the upper most part of the engine.....its a lifter or rocker arm......if it sounds like a deep knock ...its the Piston hitting the cylinder head cause by the rod or its bearing that's went out......Thanks Joey : Please rate my answer if we are done.....so as I will get paid or ask more

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Customer reply replied 1 year ago
if it were a Bearing oil pressuree would be affected if it were a lifter check engine light or message would be displayed.
Customer reply replied 1 year ago
PS I am a Auto mechanic also; However I have not seen many of these newer engines with this type of problem. I believe it may be tied to the sensor that converts it from eight to four cylinder operation.
GMC Mechanic: joeplow, ASE Certified Technician replied 1 year ago

Hello , Oh the oil pump would compensate for that small oil pressure loss.....which I think its the lifter......because of the tap noise

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GMC Mechanic: joeplow, ASE Certified Technician replied 1 year ago

Sensor will not cause a noise

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Customer reply replied 1 year ago
Saw this in a Ford Coyote engine with dual overheads. causing the valves to float stuck in between cycles
GMC Mechanic: joeplow, ASE Certified Technician replied 1 year ago

ok , ill opt-out....let someone else help you...take care

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Customer reply replied 1 year ago
Do not even know how this 6.2 converts back and forth though. I am a ford man
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 1 year ago
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 29,591
Experience: GM Grand Master Technician 2007. 14 year experience.
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Hi there, I am Cam, can I get your first name please?

Can you describe the noise more? Light tapping? Does it change with any cylinders disabled?
What scan abilities do you have?

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Customer reply replied 1 year ago
Sorry I have left for today for an appointment Loud tapping like a lifter but seems to be coming from lower in engine toward rear middle. have not put a stethoscope on it yet just took a brief look this morning saw it was not anything minor and went to another project.
unfortunately it is at my home and not my shop which is 40 miles away.
Customer reply replied 1 year ago
Greg is first Name Cam.
Customer reply replied 1 year ago
How do disable cylinders?
Customer reply replied 1 year ago
I am more of a diesel mech. and have done nothing on GM The Coyote was my first experience with engines that drop from 4-8 when cruising and I had a skilled Ford guy with me when we found it.
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 1 year ago

Greg, do you have a scanner? WE disable with the injector balance test, but I suppose you can disable by unplugging each coil control wires one at a time.

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GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 1 year ago

Knowing what cylinder will help. Its 1 4 6 and 7 that cut off by the lifters and this can be seen if one failed by removing the valve cover, hooking the coil pack back up and running it. Now on these I have see the odd one with a build up of carbon that when warm would make the pistons carbon hit the head and make a knocking noise.

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Customer reply replied 1 year ago
will try the disconnect tonight And get back with you tomorrow thanks for your patience. have and older snap on scanner
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 1 year ago

Ok, sounds good.

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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
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