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Old 07-02-2013, 06:44 PM   #1
Lgndryhr
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L99 Lifters and a TSB

My lifters have been more noticeable lately. Should I take it in? I can hear them pretty well when I start it up during a cold start. I bought her used back in April with about 24k miles. It's a 2009 produced 2010 2SS/RS.

Also, my car is listed under the TSB #09207 -SERVICE UPDATE - HVAC RPG, ENG HARN INSP, REAR SPOILER FAST -*EXP W/BASE WARR*
Is there any way to check if this was done or needs to be done?
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Old 07-03-2013, 07:47 AM   #2
Stealth6
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Bulletin No.: 10-06-01-007D

I would certainly bring it in...

TECHNICAL
Bulletin No.: 10-06-01-007D
Date: April 10, 2012
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 AFM 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, Escalade ESV, Escalade EXT
2007 Chevrolet Monte Carlo
2007-2009 Chevrolet Impala
2007-2011 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer, TrailBlazer EXT
2010-2011 Chevrolet Camaro SS
2007-2011 GMC Envoy, Envoy XL, Sierra, Yukon, Yukon Denali, Yukon XL, Yukon XL Denali
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, refer to Engine Mechanical > Diagnostic Information and Procedures > Symptoms in SI. Supercede:
This bulletin is being revised to update the Correction information by removing the non-AFM valve lifter replacement and removing the non-AFM valve lifter Parts Information. Please discard Corporate Bulletin Number 10-06-01-007C (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. Notice
Allow at least a two hour soak time between engine OFF and start up when evaluating the valve lifter tick noise. 2. Start the engine and evaluate the valve lifter tick noise. ¤ If the valve lifter tick noise is still present, replace all 8 active fuel management (AFM) valve lifters ONLY. Refer to Valve Lifter Replacement (With AFM) in SI.
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Old 07-03-2013, 08:54 AM   #3
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Looking at your post, the engine wiring harness TSB is just as important to fix as the lifter issue. Your car could burn up if you have the wiring harness issue.

Go to the dealer asap.
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Old 07-03-2013, 01:39 PM   #4
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Quote:
Originally Posted by Lgndryhr View Post
My lifters have been more noticeable lately. Should I take it in? I can hear them pretty well when I start it up during a cold start. I bought her used back in April with about 24k miles. It's a 2009 produced 2010 2SS/RS.

Also, my car is listed under the TSB #09207 -SERVICE UPDATE - HVAC RPG, ENG HARN INSP, REAR SPOILER FAST -*EXP W/BASE WARR*
Is there any way to check if this was done or needs to be done?

Hello Lgndryhr,

Your fellow forum members have some great advice that I agree with. I recommend taking your vehicle in for service as soon as possible. If you would like, I would be happy to help set that appointment up for you. It will save you some hassle. To do this, please private message me your VIN, current mileage, name, number, address and your involved dealer's information.

Reggie B.
Chevrolet Customer Care
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