L99 Lifter tick carnage....

[Cal 20112SS]

Found this video on you tube. Not sure what motor this is, but this is exactly what we're hearing.

[PQ]

Originally Posted by Cal 20112SS

Found this video on you tube. Not sure what motor this is, but this is exactly what we're hearing.

I felt that guy had it backward. The ones on the right were spitting more.

[1Camaro2SS]

Mine seems to have a slight tick as well. I guess I better put my factory air intake back on and restore my factory tune and take it in. Do you think they will give me a hard time about replacing my exhaust? Hopefully they won't use it against me to void warranty.

[blackknight]

Originally Posted by Cal 20112SS

Found this video on you tube. Not sure what motor this is, but this is exactly what we're hearing.

is that good to run a motor without the valve covers on.....

Originally Posted by 1Camaro2SS

Mine seems to have a slight tick as well. I guess I better put my factory air intake back on and restore my factory tune and take it in. Do you think they will give me a hard time about replacing my exhaust? Hopefully they won't use it against me to void warranty.

Hopefully not, since there is a TSB on it. make sure you print off the TSB and bring it in with you. You can find it on this site somewhere, ill see if i can find the link.

[PQ]

Originally Posted by blackknight

is that good to run a motor without the valve covers on.....



Hopefully not, since there is a TSB on it. make sure you print off the TSB and bring it in with you. You can find it on this site somewhere, ill see if i can find the link.

Sounds like he was about to take the heads off anyway.

[MS3DALE]

Service Information


Document ID: 2547180
#10-06-01-007B: Active Fuel Management (AFM) Engine, Valve Lifter Tick Noise at Start Up When Engine Has Been Off for 2 Hours or More (Evaluate Noise and/or Replace Valve Lifters) - (Nov 17, 2010)

Subject:Active Fuel Management (AFM) Engine, Valve Lifter Tick Noise at Start Up When Engine Has Been Off for 2 Hours or More (Evaluate Noise and/or Replace Valve Lifters)

Models:2007 Buick Rainier

2009 Buick LaCrosse Super, Allure Super (Canada Only)

2007 Cadillac Escalade

Built Prior to April 1, 2006 with 6.2L Engine RPO L92 (These engines were built with AFM Hardware but the AFM system was disabled)

2010-2011 Cadillac Escalade

2007 Chevrolet Monte Carlo

2007-2009 Chevrolet Impala

2007-2011 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer
2010-2011 Chevrolet Camaro SS
2007-2011 GMC Envoy, Sierra, Yukon
2007-2008 Pontiac Grand Prix
2008-2009 Pontiac G8
2007-2009 Saab 9-7X
Equipped with AFM (Active Fuel Management) and V8 Engine RPO L76, L94, L99, LC9, LFA, LH6, LMG, LS4, LY5 or LZ1

Attention: This bulletin only applies to the AFM V8 engines listed above. It DOES NOT apply to Non-AFM Engines. If you are dealing with a Non-AFM engine that is experiencing a similar noise, please refer to Engine Mechanical > Diagnostic Information and Procedures > Symptoms in SI.

This bulletin is being revised to add the 2011 model year. Please discard Corporate Bulletin Number 10-06-01-007A (Section 06 - Engine/Propulsion System).

Condition

Some customers may comment on an engine valve lifter tick noise that occurs after the engine has been shut off for at least two hours. The tick noise may last from two seconds to ten minutes.

Cause

This condition may be caused by any of the following:

• Aerated oil in the valve lifter body, resulting in the valve lifter being unable to purge the air quickly.

• A low engine oil level or incorrect oil viscosity.

• Dirty or contaminated oil.

• A low internal valve lifter oil reservoir level.

• Debris in the valve lifter.

• A high valve lifter leak down rate.

Correction

If the SI diagnostics do not isolate the cause of this valve lifter tick noise and normal oil pressure is noted during the concern, perform the following steps:

1. Inspect the engine oil condition and level. Refer to Owner Manual > Service and Appearance Care > Checking Things Under the Hood > Description and Operation > Engine Oil in SI.
   ⇒If the engine oil is more than one quart low, an incorrect oil viscosity is being used or if poor quality/contamination is observed, change the oil and filter.

1. 
   Note: Allow at least a two hour soak time between engine OFF and start up when evaluating the tick noise.
2. Start the engine and evaluate the valve lifter tick noise.
   ⇒If the valve lifter tick noise is still present, replace all 16 valve lifters. Refer to Valve Lifter Replacement in SI.
   
   

Note: A V8 AFM engine requires 8 AFM lifters and 8 non-AFM lifters for a total of 16 lifters.

Part Number

Description

Qty

12576400 - Non AFM Hydraulic Valve Lifter - Qty.8

12632143 - AFM Hydraulic Valve Lifter - Qty.8

Warranty Information (excluding Saab Models)

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

J0627

Valve Lifter Replacement - Both Sides

Use Published Labor Operation Time

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

© 2011 General Motors. All rights reserved.

[SScattergunSS]

MS3DALE, thanks for posting this!

[Revo1]

Originally Posted by SScattergunSS

If we could arm ourselves with that bulletin before we go in there, that'd be great! Anyway, the person to see in there is Carol. She's the only gal working in the service department.

I've been working with Carol, she's great Just hope the techs are honest enough to fess up if they do hear the tap........

[blackknight]

thanks MS3DALE, i couldnt find it

[Diabel1969]

Originally Posted by blackknight

is that good to run a motor without the valve covers on.....



Hopefully not, since there is a TSB on it. make sure you print off the TSB and bring it in with you. You can find it on this site somewhere, ill see if i can find the link.

it doesn't hurt anything to run with the valve covers off, as long as it's not for a long period of time, or the oil may puddle on the exhaust and catch fire eventually. What concerns me is this guy is a moron running crane race gold full roller rockers on exhaust's and comp cams roller tip rockers on intake's. In some cases, some "free" power is to be made by faking out the engine with staggered rocker ratio's to make it think the cam is bigger than what it is, but should be done with same type/style rocker arms.. this guy is looking to damage that engine. and to answer somebody else, he doesn't have to pull the heads to change lifters, just pull the intake.. the LS series require pulling the heads.. My 5.3 truck produced the same noise, but no TSB was made to cover that.. I replaced the whole engine after other issues, but if the TSB is out there, have it taken care of while they're offering!

[04Ram2500Hemi]

I haven't started my Camaro for over two months now, but it seems to me that it has always ticked. I've honestly never thought much about it, but now ya'll have me worried. Looks like I'll have to play closer attention to it come spring and see what it does.

[blackknight]

Originally Posted by 04Ram2500Hemi

I haven't started my Camaro for over two months now, but it seems to me that it has always ticked. I've honestly never thought much about it, but now ya'll have me worried. Looks like I'll have to play closer attention to it come spring and see what it does.

The ticking from mine was pretty loud. I mean like i knew something was wrong. Maybe some are worse than others. but yea check urs out man for sure.

[brantley847]

Originally Posted by blackknight

The ticking from mine was pretty loud. I mean like i knew something was wrong. Maybe some are worse than others. but yea check urs out man for sure.

If they read the title of the thread they would have known...CARNAGE!!!!!!!!!!!!!! RAGE!!!!!!!!!!!

[RedVictory]

my v6 is ticking, never thought much of it, i know that TSB applies to V8s but is it common is v6s?

Now im kinda concerned