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09 Sierra Light Knocking Sound!

ballon78

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ballon78 Enthusiast

ballon78

Posted
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2009 5.3, 5500 miles, changed oil at 1000, 3000, and 5000 and since it was new its always had a light knock at idle, but now wheni accel from stop you can hear it knock very lightly. I thought it was, steering pump or alt or something so i took the belt of and ran it and it still does. knock all the way up to 2200 hundred then you can hear it because of engine noise. Have to can dealer but im sure they will say they cant hear it or its normal. Every oil change the oil looks very dirty for a new truck. Allways used castrol gtx for 2 changes with ac filter then went syn for 5000 change. It also tick on start up for 15 sec when reallly cold. I can make it know in nutreal so i hope they hear it and just toss a new crate motor in, boating season is coming up and plan to do a bunch of towing 1000 mile round trips, so dont want a bad motor!!!

cerbomark Senior Enthusiast

cerbomark

Posted
Posted

I can t see the dealer putting in a new motor cause of the light knocking sound. They ll probably tell you it s normal. Your not the first one here with this complaint.

Sir Dan Enthusiast

Sir Dan

Posted
Posted

Uh Oh! Another knocking 5.3 with AFM...not good.

You have to take it in to the dealer so they can put in another set of crappy AFM lifters. :lol:

They will not give you a new engine and as cerbomark says they'll probably tell you it's normal. There is a problem with some of the lifters on these 5.3 engines that relates to the AFM system and seems worse with the 2009 models.

cerbomark Senior Enthusiast

cerbomark

Posted
Posted

I know we been there before but what if the AFM is turned off (Mine is), will that stop the issue? Would it have to be turned off prior to making noise to work? PS/ mines quiet.

 

SirDan/ you have a 1 in RC leveling kit? Hows that sit? About a 1 inch rake left?

ballon78 Enthusiast

ballon78

Posted
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I know we been there before but what if the AFM is turned off (Mine is), will that stop the issue? Would it have to be turned off prior to making noise to work? PS/ mines quiet.

 

SirDan/ you have a 1 in RC leveling kit? Hows that sit? About a 1 inch rake left?

 

This isn't have anything to do with the AFM lifters yet!!! I have had mine turned off since the first week i had it. Its an engine knock and you can hear it pretty good. Im sure they say it normal. Im afriad they will say that i turned the afm off and installed a different program in it or something like that. I just turned the AFM back on and installed the factory tune in it and its a load of crap to drive now!!!! I'll bring it to them next week maybe, it just sucks.

Sir Dan Enthusiast

Sir Dan

Posted
Posted
I know we been there before but what if the AFM is turned off (Mine is), will that stop the issue? Would it have to be turned off prior to making noise to work? PS/ mines quiet.

 

SirDan/ you have a 1 in RC leveling kit? Hows that sit? About a 1 inch rake left?

Yeah, it's about 1" difference between front and rear. I tried the 2" and 1.5" leveling shims and even the lightest load in the bed made it squat rearward which I hate. This suits me just right and also takes some strain off the already weak balljoints. As for turning AFM off making any difference with the lifters, that's a big NO. On or off, the afm lifters are still having issues, not all but some.

rodram Enthusiast

rodram

Posted
Posted
This isn't have anything to do with the AFM lifters yet!!! I have had mine turned off since the first week i had it. Its an engine knock and you can hear it pretty good. Im sure they say it normal. Im afriad they will say that i turned the afm off and installed a different program in it or something like that. I just turned the AFM back on and installed the factory tune in it and its a load of crap to drive now!!!! I'll bring it to them next week maybe, it just sucks.

 

don't get me wrong ... I like my Chevy Truck .... but this kind of thing is what keeps Ford, Dodge, and some of those import guys in business........

Prokopchuk_9 Senior Enthusiast

Prokopchuk_9

Posted
Posted

my 06 with 6.0 has piston slap, my 2002 had piston slap and my 98 had noisy lifters, my 95 had reaaaally noisy engine LOL. they all lasted till 200-250k kms, sold them with no issues. my truck now the 06 has the "cold start knock" and a little bit of piston slap at idle or low rev...barely hear it with the exhaust i have on my truck tho. some of our work trucks with AFM are BRUTAL, vibrate and knock...get used to it.

Matt09SLT Enthusiast

Matt09SLT

Posted
Posted

yep, It's pretty common... All three of my vehicles with GM GEN III & IV V8's have made a light knocking sound -- Now the loud lifter noise on my 09 at startup (occasionally) is another story.

Kblaze94 Enthusiast

Kblaze94

Posted
Posted

I havent noticed this on my just a slight exhaust leak which my buddy has too. But my buddy does say his has a slight knock and my dads 6.0 does and was told it's piston slap and common..i know LS1's were known for piston slap as well..never noticed it on mine tho

Sir Dan Enthusiast

Sir Dan

Posted
Posted
my 06 with 6.0 has piston slap, my 2002 had piston slap and my 98 had noisy lifters, my 95 had reaaaally noisy engine LOL. they all lasted till 200-250k kms, sold them with no issues. my truck now the 06 has the "cold start knock" and a little bit of piston slap at idle or low rev...barely hear it with the exhaust i have on my truck tho. some of our work trucks with AFM are BRUTAL, vibrate and knock...get used to it.

Yeah, like everyone wants to drive around in a new truck that sounds like it's got a death rattle all the time...sheesh! Gov't Motors needs to get with the program.

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