2009 cobalt SS T/C

SOMETIMES at start up, usually a cold start i hear a rough grinding or rattling sound from under the hood and it only last 1 or 2 seconds. has anyone else had this problem?? i havent seen a thread about this yet

 

maybe the oil takes a couple of strokes to get pulled up and it ticks a few times, just my guess.

 

As your Cobalt is a 2009, it is very well may still within its Bumper-to-Bumper warranty. If you were to private message me, I could check on the warranty parameters of your vehicle (specific date and mileage of expiration) and check into any open recalls. I do need to use the last 8 digits of your VIN to do this check.

Best,
Sarah
GM Customer Service

 

I haven't heard a grinding but I'll be sure to listen more closely next time. I do know at 24degreesF my car is loud as **** the first 15-20 seconds or so.

 

it could be something rattling against the exhaust maybe
mine kinda did that it was the cat rattling on the sway bar so i just got it adjusted and it doesnt make that sound anymore

 

ive never had grinding...just the sweet diesel sound till it warms up (loud opening/closing of valves)

 

You mean this?

#PIP4716C: Sharp Engine Rattle Noise At Start Up May Also Set P0011 P0014 P0016 P0017 - (Aug 2, 2011)

Subject:
Sharp Engine Rattle Noise At Start Up may also set P0011 P0014 P0016 P0017

Models:
2010 Buick LaCrosse
2009-2010 Chevrolet Cobalt
2010 Chevrolet Equinox
2009-2010 Chevrolet HHR
2009-2010 Chevrolet Malibu
2010-2010 GMC Terrain
2009-2010 Pontiac G5
2009-2010 Pontiac G6
2009-2010 Pontiac Solstice
2009-2010 Saturn Aura
2009-2010 Saturn Sky
2009-2010 Saturn Vue

Equipped with the following engines
2009-2010 2.0L (RPO LNF)
2009-2010 2.2L (RPO LAP/LE8)
2009-2010 2.4L (RPO LE5/LE9/LAT/LAF



--------------------------------------------------------------------------------
This PI was superseded to remove 2011 model years. Please discard PIP4716B.
--------------------------------------------------------------------------------

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

Condition/Concern:


In rare instances a technician may comment they hear a short, sharp rattle noise from the front of the engine at start up. P0011 P0014 P0016 or P0017 may also set during this condition.

Recommendation/Instructions:


If the noise is from the front accessory drive area, inspect the engine belt. We have seen concerns with engine belts causing a loud ticking type noise. If found, verify power steering pulley outer edge is aligned flush with shaft and repair as needed. If pulley alignment is correct replace the engine belt.

If the noise is still present and is very short and sharp in duration (2-5 seconds). This may be an issue with the cam phasers not parking properly. Once the noise is verified as the phasers, they must be replaced. If the cam phasers are replaced, remove the CMP actuator solenoids to inspect for debris. If debris is found, clean and inspect for torn or loose screens and replace solenoid if necessary.


Note: If debris is found in the solenoids and phasers, change the oil and filter before returning to service, In some instances it may be necessary to change the oil/filter multiple times with a test drive in between each one. The filter and solenoids can be inspected afterwards to ensure no additional debris is present.

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.

 

mine does the same thing. seems to happen more with the colder days. we had a 9 degree day here couple weeks ago and it did it.

ill have to talk to my buddy who works at the dealership i bring my car to for waranty work

 

Mine's done this forever, and it's a 2008 so weird it's not covered by the TSB. It's rare but I know the noise you're talking about, and generally only does it when it starts to cool off.

 

im bringing my car into the dealer to see if they can figure out the problem.

i printed this --->
#PIP4716C: Sharp Engine Rattle Noise At Start Up May Also Set P0011 P0014 P0016 P0017 - (Aug 2, 2011)

Subject:
Sharp Engine Rattle Noise At Start Up may also set P0011 P0014 P0016 P0017

Models:
2010 Buick LaCrosse
2009-2010 Chevrolet Cobalt
2010 Chevrolet Equinox
2009-2010 Chevrolet HHR
2009-2010 Chevrolet Malibu
2010-2010 GMC Terrain
2009-2010 Pontiac G5
2009-2010 Pontiac G6
2009-2010 Pontiac Solstice
2009-2010 Saturn Aura
2009-2010 Saturn Sky
2009-2010 Saturn Vue

Equipped with the following engines
2009-2010 2.0L (RPO LNF)
2009-2010 2.2L (RPO LAP/LE8)
2009-2010 2.4L (RPO LE5/LE9/LAT/LAF



--------------------------------------------------------------------------------
This PI was superseded to remove 2011 model years. Please discard PIP4716B.
--------------------------------------------------------------------------------

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

Condition/Concern:


In rare instances a technician may comment they hear a short, sharp rattle noise from the front of the engine at start up. P0011 P0014 P0016 or P0017 may also set during this condition.

Recommendation/Instructions:


If the noise is from the front accessory drive area, inspect the engine belt. We have seen concerns with engine belts causing a loud ticking type noise. If found, verify power steering pulley outer edge is aligned flush with shaft and repair as needed. If pulley alignment is correct replace the engine belt.

If the noise is still present and is very short and sharp in duration (2-5 seconds). This may be an issue with the cam phasers not parking properly. Once the noise is verified as the phasers, they must be replaced. If the cam phasers are replaced, remove the CMP actuator solenoids to inspect for debris. If debris is found, clean and inspect for torn or loose screens and replace solenoid if necessary.


Note: If debris is found in the solenoids and phasers, change the oil and filter before returning to service, In some instances it may be necessary to change the oil/filter multiple times with a test drive in between each one. The filter and solenoids can be inspected afterwards to ensure no additional debris is present.

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.


so i can give them some kind of idea about what it could be.

my appointment isnt until monday so we will see how it goes. im sure my car wont do it.

i noticed this afternoon when firing my car up to let it warm up,the RPM's sit at like 1400 for a second or 2 and then the noise happens and it drops down to about 1000 RPMS and then it goes back up to around 1200-1400PMS's.

 

i have been meaning to post a thread about this as well. it is worse the colder it is. especially if it has sat all night

 

yea,for sure. i just hope it isnt f**kin anything up on my car lol

i wonder if anyone on here has had this problem and had it fixed.

 

i have only had my car since sept. so when it started gettin colder out it was the first time i could notice it. it irritates me

 

mine is exceptionally loud at start up when it's in the 30's out.

 

^yep

 

My car is sooooo damn loud with the muffler delete. And this little problem is very irritating for sure. Drives me nuts!

 

Yeah I have this issue and mine is an 08.

 

Interested to learn how your appointment on Monday goes, 09TcSedan. Have a great holiday weekend!
Sarah
GM Customer Service

 

thank you,i printed that paragraph out and i called the dealership to make the appointment and the lady who i talked to was like wtf are you talking about lol but a good buddy of mine works at the same dealership and he knows what the deal is. i will keep everyone posted to see what the dealship says.

you have a good holiday weekend too!

 

could it be the cam chain tensioner. ive read all over the place on here that people have been replacing them cause when its cold at start up it makes a noise. its more of a rachety clanking noise. ( probably the cam chain slapping around )

i could be wrong..... and it might not be your problem... but its a very loud noise though. and iam having the same thing happen when starting the car. mines an 08tc

 

yea idk. i guess we will see what the dealership says. but yea it only lasts for about a second or 2 right when i fire it up.


totally jacked this thread lol

 

I've heard this ...... sounds like a dry motor.....like 1st start after an oil change almost. I havent heard it in a year or so . I don't want to say the oil makes a difference but............ I changed to amsoil a year ago and havent heard it since..... prolly just a coincidence thou.

 

Well I am due for a change, so could have something to do with that I guess.

 

I get the same noise every now and then when she's cold but necessarily if its cold outside. I'm pretty sure it's bc the oil has drained off of everything and its running dry for that quick sec at startup.

 

just had my car into mauer chev and my car didnt have a CEL on the dash but the tech said there was a code there,a P0011 code. not sure of the name of the code but they replace the cam valves...i guess lol
the tech said at first when i showed him the bulliten that a CSS member had posted on this thread and he said "cam phasers? that would be a tear down,gotta pull the cover off"

they installed a 12646783:valve
and a 12646784:valve

i think that is the GM number possibly?

but if your under warranty,theres a bulliten on this and i waited for my car. i guess we will see if the noise is still there tomorrow morning when i fire her up for work!