GM L92 / 6.2L Engine Noise Help

2L8IWIN

2L8IWIN

Club Member
Hey Guys,

I have a 6.2L L92 in an Escalade that is making a noise that I need help diagnosing.

It only does it after 2nd gear (part throttle) and gets louder as you climb through the gears (loudest 1200-2000rpms). Its most noticeable in 4th, 5th & 6th when cruising around and slowly accelerating/maintaining speed.

No sounds at start up, idle, free rev, or throughout first gear 900-6000RPM that i can hear. If I do a manaul gear select and keep it in first and mash the gas/brake to load the engine/let the RPMS climb I dont hear anything.

I dont think its anything internal like a bearing, wrist pin, lifter, etc as it would scream out at me in 1st under load.

Here is a video of it. This is from a stop up to 4th at about 40. You can really hear it around the 49-55 second mark.

Could it be detonating/pre-ignition from bad knock sensors? I was going to burn up the rest of this 87 and run some 92 and see if it helped.

Transmission/converter?

http://www.youtube.com/watch?v=BRylLOa0agA
 
Last edited:
Sounds like drive train maybe the transfer case? had the wheels and tire balanced or rotated lately? Could be in the trans as well. could be the front half shafts or front diff as well all are know to cause weird noises.
 
I dont think its the wheels or tires as its throttle related, meaning the noise only appears under acceleration after 1st gear.
strange.
 
Havent checked the oil pressure manually. Ive never received a warning from the DIC and it doesnt tick or knock at idle (700rpms).

I could manually check it (where is a port on these engines"?) and do a compression test as well.
 
You must log in or register to reply here.
Back
Top