bought my car about a month ago from a dealership. second day I had it, it started makng a strang noise, almost like it was a diesel!! its an 07 with 80,000 on it. Its still under warrenty. But, they dont seems to concerned about it. Car runs fine, and when I step on the gas it goes away... it only happens once and a while. doesnt matter if its hot or cold, just really random. My intercepter shows misfires. I changed the plugs and that did nothing. Anybody help? So I can go into the dealership and tell em to fix this thing?!

YouTube - Bad noises!

Thanks guys!

 

yea these motors are noisy, not that noisy though. the random knocking sound is what isn't normal for them. unless the noise is in the s/c lol.

 

Ya I know its not normal, just trying to figure out what it is

 

coming from the s/c or the motor, s/c will sound like marbles sometimes lol...sounds like its something in the head tho from the vid.

 

motor.

 

it's either the supercharger coupler or the timing chain tensioner

 

how would you know which it is? is there anyway?

 

if its comin from the motor then timing chain, idk if id say that's all it is though it sounds choppy like it has an intake side leak or something too.

 

Well I just put a new intake on it the other day and it still does it...

 

lol not saying it is the intake saying its hard to believe its JUST a timing chain tensioner because at the beginning car sounds like it has an intake side leak i.e. intake manifold.

 

Found a few more videos, sounds like it is the timing chain tensioner...

oh... sorry. clearly a newb with cars! lol

 

Sounds like a rod to me.

but it could be a number of things.

 

#PIP4014: Parts Update - Timing Chain Tensioner Design Change - keywords adjuster after change chain chevrolet damage design engine filter hot idle indicator information lamp lash lifter light mechanical no - (Jan 4, 2007)


Subject: Parts Update - Timing Chain Tensioner Design Change


Models: 2002-2005 Chevrolet Cavalier

2005-2007 Chevrolet Cobalt, Cobalt SS

2006-2007 Chevrolet HHR

2004-2007 Chevrolet Malibu

2004-2005 Chevrolet Malibu Classic

2002-2004 Oldsmobile Alero

2007 Pontiac G5

2002-2005 Pontiac Grand Am, Sunfire

2005-2006 Pontiac Pursuit (Canada Only)

2006-2007 Pontiac Solstice

2003-2007 Saturn Ion

2004-2007 Saturn Ion Redline

2001-2005 Saturn L Series

2002-2007 Saturn Vue

with any of the following engines:

2.0L Engine (VIN P - RPO LSJ)

2.2L Engine (VIN D or F - RPO L61)




--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
When replacing the timing chain tensioner, some technicians may notice that the replacement timing chain tensioner does not contain an O-ring like the original timing chain tensioner that they removed from the vehicle (original design shown below). As a result, some technicians may believe that they received the incorrect timing chain tensioner from their parts department.





Recommendation/Instructions:
Due to a design change and related part number supersession that took place during August 2004, the replacement timing chain tensioner from SPO no longer contain an O-ring as shown above. Instead, the tensioner body of the replacement timing chain tensioner is about .480" (12.192 mm) thicker than the original tensioner design. This causes the timing chain tensioner to fit tighter into the cylinder head, allowing it to operate without an O-ring like the original one. As a result, the new design timing chain tensioner (no O-ring) can be used in place of the original design timing chain tensioner (with O-ring).

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

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


© 2008 General Motors Corporation. All rights reserved


EDIT Found it

AIP3252

MODELS:
206-2007 CHEVROLET COBALT, COBALT SS
2006-2007 CHEVROLET HHR
2006-2007 CHEVROLET MALIBU
2007 PONTIAC G5
2006-2007 PONTIAC G6
2006 PONTIAC PURSUIT(CANADA ONLY)
2006-2007 PONTIAC SOLSTICE
2006-2007 SATURN ION REDLINE
2007 SATURN SKY

BUILT BETWEEN 4/1/06 - 11/1/06
WITH ANY OF THE FOLLOWING ENGINES
2.0 ENGINE (VIN P - RPO LSJ)
2.2 ENGINE (VIN D OR F - RPO L61)
2.4 ENGINE (VIN B OR P - RPO LE5)

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

CONDITION/CONCERN:

On rare occasions, a tick or rattle noise may be heard from behind the front cover of the engine and/or pieces of a timing chain roller may be found during an oil change. This may be the result of a timing chain concern.

Non-heat treated timing chain rollers were randomly installed in the assembly line hoppers. He advised that this happened sometime between 4/1/06 - 11/1/06 so it can randomly affect late 2006 - early 2007 models.

RECOMMENDATION/INSTRUCTIONS:

If this concern is experienced, inspect the timing chain for missing or damaged timing chain rollers. If a missing or damaged timing chain roller is found, replace the timing chain and gears using the part numbers currently listed in the parts catalog.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

 

car has been at the shop for four days now. hasnt made a noise and they wont do anything until it does. GM is saying they have never heard of this problem or that bulletin above. They are now installing a computer and the service manger is taking it home with him and whenever it messes up he presses this button and it records it... FML!!