2006 4.2 Trailblazer Engine noise/knocking - VIDEO and SOUND

CASHKJ

Original poster
Member
Feb 4, 2013
28
Here is a video of what the engine in my TB sound like any ideas.

Thanks!


[video=youtube;ABzWUrhlgT0]http://www.youtube.com/watch?feature=player_detailpage&v=ABzWUrhlgT0[/video]
 

CaptainXL

Member
Dec 4, 2011
2,445
That's rod knock I believe. Drain oil and check for metal or send to a lab for analysis to check for bearing material. Sorry.
 

Harpo

Member
Dec 4, 2011
419
Sweden
OUCH that doesent sound to good.

But it seems to be louder at the back of the Engine.

And it is kind of strange that it suddenly stops for a while.

The first thing i comes to my mind is, check the bolts to the torque converter to see if one of them is loose.

I had that problem on a previus car , i feared the worst but it was only one bolt that came loose.
That sound also come and goes as the bolt turns.

That bolt caused a crack in the flexplate, but i rather have that than a bad rodbearing.


Just an idea to check this, its a lot easier than a rod bearing.:twocents:

Hope for the best:thumbsup:
 

gmcman

Member
Dec 12, 2011
4,658
Almost sounds too slow for a rod, hard to say though. Sounds like it's in the head.

Checking the oil will tell a story. What you need to do is loosen the coil harness fom the coil packs while it's running and see if the knock changes at the moment you pull the harness.

May throw a code but just pull one at a time for a few moments.
 

gmcman

Member
Dec 12, 2011
4,658
Once you test the individual cylinders and if the knock persists, I would get a quality oil pressure gauge and check the pressure at the sensor tap and note the pressure when the knock is present.

Could be an oil starvation issue but just a thought.
 

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