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im wondering if this is a timing chain issue.
using shims was the initial steps-- before the chain issue popped up..

do you know what any of the codes are?

the chains on some of the years have a warranty till 120,000 I think...
 

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this was posted on the Acadia forum...

I have done probably 5 or 6 sets of the chains at work. SOme of the other techs have done 15 to 20 of them. They do have a supplier issue and every chain i have taken off has been very stretched. They are kinda of intimidating the first set you do but after that I realized they are not that bad to do. THey do have special tools though to do the job. Cam holding plates are needed. The timing has to be set in a 2 stage process. Oh and there are actually 3 chains....one to each head and a primary chain that connects them and the crank. sounds confusing but not really. the front cover does need to come off and everything that is on the front cover. the lowest milage i have seen so far is 7,200 miles. I have done 2 cts and 2 srx and 1 dts. all under 25,000 miles. they also have cam postion actuator issues too. you have to measure cam end play and install shims as needed behind the actuators depending which manufacturer actuators are on the car. delphi or asin. i have done quite a few of them as well. We also have had them come in with a p0018 and p0008 which usually go along with the timing chain issue....but a few times more rare occations we had to replace the crank shafts for the engine correlation concern. there is actaually a bullitine on this. the reluctor wheel on the crankshaft which is press fit spins some on the crank and you have to replace as one unit.
 

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Depending on how bad it is, they either re-shim the camshaft end-play, or replace the cylinder head all together because the camshafts are walking. To avoid that expense nylon shims are wedged in place for now.

Check Engine Light, DTCs P0011, P0014, P0021, P0024, P0341, P0346, P0366 or P0391 Set (Check Camshaft End Play and Perform Action as Outlined) - (Feb 18, 2011)

Subject: Malfunction Indicator Lamp On -- Check Engine Light, DTCs P0011, P0014, P0021, P0024, P0341, P0346, P0366, or P0391 Set (Check Camshaft End Play and Perform Action as Outlined)
Models: 2007-2009 Buick LaCrosse, Allure (Canada Only)
2010 Buick LaCrosse
2007-2010 Buick Enclave
2007-2010 Cadillac CTS Sedan, CTS Sport Wagon, SRX, STS
2008-2010 Chevrolet Equinox, Malibu
2009-2010 Chevrolet Traverse
2010 Chevrolet Camaro
2007-2010 GMC Acadia
2007-2010 Pontiac G6
2008-2009 Pontiac G8, Torrent
2007-2010 Saturn AURA, OUTLOOK
2008-2010 Saturn VUE
Equipped with 2.8L or 3.6L High Feature V6 Engine (VINs D, T, V, 7 -- RPOs LP1, LLT, LY7)
 
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