LNF Cold Start Noise
01-31-2012, 05:05 PM
#1
LNF Cold Start Noise
Was it determind that the 1-2 second noise at cold start up that sounds a lot like someone shaking a metallic rattle can super fast was the cam phaser sensors or the timing chain tensioner??? I guess another way to describe the sound is almost like when you wind up a pull-back car really far and let it go... Or like a strange aaooogah noise....? I dunno.
I've gotten the noise 2 days in a row now and it's pissing me off.
No codes no cel. Brand new oil from about 150 miles ago using Pennzoil Ultra 5W30 and a Mobil 1 filter.
I've gotten the noise 2 days in a row now and it's pissing me off.
No codes no cel. Brand new oil from about 150 miles ago using Pennzoil Ultra 5W30 and a Mobil 1 filter.
Last edited by Gremlin85; 01-31-2012 at 07:32 PM.
02-14-2012, 09:42 PM
#2
From what I have read, its the cam phasers not "parking" properly.
My '08 has started doing it now that the weather is cold, on a cold start you can hear the metallic rattle for 1-3 seconds and the idle dips and recovers. No CEL on my car either.
According to GM's TSB, the cam phasers need to be replaced in order to correct the noise. Guess I'll have to bring it in for service.
My '08 has started doing it now that the weather is cold, on a cold start you can hear the metallic rattle for 1-3 seconds and the idle dips and recovers. No CEL on my car either.
According to GM's TSB, the cam phasers need to be replaced in order to correct the noise. Guess I'll have to bring it in for service.
02-15-2012, 10:38 AM
#3
Senior Member
Join Date: 07-30-10
Location: Detroit, Michigan USA
Posts: 1,027
Likes: 0
Received 0 Likes
on
0 Posts
From what I have read, its the cam phasers not "parking" properly.
My '08 has started doing it now that the weather is cold, on a cold start you can hear the metallic rattle for 1-3 seconds and the idle dips and recovers. No CEL on my car either.
According to GM's TSB, the cam phasers need to be replaced in order to correct the noise. Guess I'll have to bring it in for service.
My '08 has started doing it now that the weather is cold, on a cold start you can hear the metallic rattle for 1-3 seconds and the idle dips and recovers. No CEL on my car either.
According to GM's TSB, the cam phasers need to be replaced in order to correct the noise. Guess I'll have to bring it in for service.
Sarah
GM Customer Service
02-19-2012, 10:10 PM
#4
Would you be able to tell me if the powertrain warranty covers an exhaust leak at the turbo?? I have a bad ticking/exhaust leak sound under a load coming from the turbo/exhaust manifold area, and its expecially bad when cold.
02-20-2012, 10:02 AM
#5
Senior Member
Join Date: 07-30-10
Location: Detroit, Michigan USA
Posts: 1,027
Likes: 0
Received 0 Likes
on
0 Posts
The following components are covered, per the 2008 Chevrolet Warranty Manual:
Engine: Cylinder head, block, timing gears, timing
chain, timing cover, oil pump/oil pump housing,
OHC carriers, valve covers, oil pan, seals, gaskets,
turbocharger, supercharger and all internal lubricated
parts as well as manifolds, flywheel, water pump,
harmonic balancer and engine mount. Timing belts are
covered until the first scheduled maintenance interval.
Transmission/Transaxle/Transfer Case: Case,
all internal lubricated parts, torque converter,
transfer case, transmission/transaxle mounts, seals,
and gaskets.
Drive Systems: Final drive housing, all internal
lubricated parts, axle shafts and bearings, constant
velocity joints, axle housing, propeller shafts, universal
joints, wheel bearings, locking hubs, front differential
actuator, supports, front and rear hub bearings,
seals and gaskets.
As the turbocharger is included on the list, it is definitely possible that the repair would be covered; however, the dealer will need to diagnose the cause behind the sound you're hearing, which will determine whether or not the repair falls under this warranty.
I hope this is helpful for you,
Sarah
GM Customer Service
Engine: Cylinder head, block, timing gears, timing
chain, timing cover, oil pump/oil pump housing,
OHC carriers, valve covers, oil pan, seals, gaskets,
turbocharger, supercharger and all internal lubricated
parts as well as manifolds, flywheel, water pump,
harmonic balancer and engine mount. Timing belts are
covered until the first scheduled maintenance interval.
Transmission/Transaxle/Transfer Case: Case,
all internal lubricated parts, torque converter,
transfer case, transmission/transaxle mounts, seals,
and gaskets.
Drive Systems: Final drive housing, all internal
lubricated parts, axle shafts and bearings, constant
velocity joints, axle housing, propeller shafts, universal
joints, wheel bearings, locking hubs, front differential
actuator, supports, front and rear hub bearings,
seals and gaskets.
As the turbocharger is included on the list, it is definitely possible that the repair would be covered; however, the dealer will need to diagnose the cause behind the sound you're hearing, which will determine whether or not the repair falls under this warranty.
I hope this is helpful for you,
Sarah
GM Customer Service
02-22-2012, 09:41 PM
#7
The noise doesn't cause any damage, its the root of the noise thats the concern. The cam phasers are supposed to "park" after shutdown, probably at zero degrees advance/retard. Apparently some phasers are having problems with doing that, which results in the metallic rattle as oil prossure reaches the actuators and they jump to whatever timing position they are supposed to be at during cold start/cat warm up mode.
Its one of those issues that probably won't ever cause any real problems since the phasers seem to work fine once they recieve oil pressure, but if you are under warranty, might as well has it addressed now instead of taking the chance of having an issue later on.
03-12-2012, 12:01 PM
#11
Senior Member
Join Date: 07-30-10
Location: Detroit, Michigan USA
Posts: 1,027
Likes: 0
Received 0 Likes
on
0 Posts
Unfortunately, I don't have access to TSBs at this time. As for whether or not a repair on this rattling concern would be covered under warranty, this depends upon whether the root of the concern is diagnosed to be an item covered by the powertrain warranty if the vehicle is older than 3 years old (I included a list of those components earlier in the thread).
I hope this helps to clarify. If I can answer any further questions please let me know!
Sarah
GM Customer Service
03-12-2012, 09:28 PM
#12
New Member
Join Date: 08-18-08
Location: cincinnati
Posts: 55
Likes: 0
Received 0 Likes
on
0 Posts
Good morning quickboat,
Unfortunately, I don't have access to TSBs at this time. As for whether or not a repair on this rattling concern would be covered under warranty, this depends upon whether the root of the concern is diagnosed to be an item covered by the powertrain warranty if the vehicle is older than 3 years old (I included a list of those components earlier in the thread).
I hope this helps to clarify. If I can answer any further questions please let me know!
Sarah
GM Customer Service
Unfortunately, I don't have access to TSBs at this time. As for whether or not a repair on this rattling concern would be covered under warranty, this depends upon whether the root of the concern is diagnosed to be an item covered by the powertrain warranty if the vehicle is older than 3 years old (I included a list of those components earlier in the thread).
I hope this helps to clarify. If I can answer any further questions please let me know!
Sarah
GM Customer Service
03-12-2012, 09:59 PM
#13
Senior Member
Join Date: 11-25-07
Location: St.Paul minnesnowta
Posts: 2,966
Likes: 0
Received 0 Likes
on
0 Posts
Cobalt SS/TC cold start with a rattle/funky sound - YouTube
does it sound like this???
mine made this noise. i dropped it off at the dealership after about 2 weeks they replaced the tensioner/timing chains/cam actuators/cam phasors/timing chain guides.
noise is gone. once and a while i will hear the noise but not nearly as bad as the noise herd in the video.
does it sound like this???
mine made this noise. i dropped it off at the dealership after about 2 weeks they replaced the tensioner/timing chains/cam actuators/cam phasors/timing chain guides.
noise is gone. once and a while i will hear the noise but not nearly as bad as the noise herd in the video.
03-13-2012, 08:18 AM
#14
Senior Member
Join Date: 07-30-10
Location: Detroit, Michigan USA
Posts: 1,027
Likes: 0
Received 0 Likes
on
0 Posts
03-13-2012, 08:35 AM
#15
New Member
Join Date: 02-23-12
Location: Midwest
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Get it checked out. Mine was making this noise for a while... it's now sitting in the driveway because the timing chain broke. It's an issue with the tensioner, not the phasers.
03-13-2012, 08:58 AM
#16
New Member
Join Date: 08-18-08
Location: cincinnati
Posts: 55
Likes: 0
Received 0 Likes
on
0 Posts
Mine is a loud rattling for a few seconds at startup, but not everytime you cold start it. So you know when its brought to the dealer it wont do it and they will look at me with deer in the headlights.
03-13-2012, 11:47 AM
#17
Senior Member
Join Date: 07-04-10
Location: Calgary
Posts: 898
Likes: 0
Received 0 Likes
on
0 Posts
Cobalt SS/TC cold start with a rattle/funky sound - YouTube
does it sound like this???
mine made this noise. i dropped it off at the dealership after about 2 weeks they replaced the tensioner/timing chains/cam actuators/cam phasors/timing chain guides.
noise is gone. once and a while i will hear the noise but not nearly as bad as the noise herd in the video.
does it sound like this???
mine made this noise. i dropped it off at the dealership after about 2 weeks they replaced the tensioner/timing chains/cam actuators/cam phasors/timing chain guides.
noise is gone. once and a while i will hear the noise but not nearly as bad as the noise herd in the video.
03-13-2012, 12:47 PM
#18
New Member
Join Date: 02-23-12
Location: Midwest
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Definitely not surge. That's exactly what my car sounded like, except it didn't have quite as much delay before the noise at :25. I believe that is the tensioner pumping up. After that event the car sounds completely normal. Prior to that event it rattles (chain slapping guides), like an older car on dry start without an anti-drain back oil filter.
03-13-2012, 01:15 PM
#19
Senior Member
Join Date: 11-25-07
Location: St.Paul minnesnowta
Posts: 2,966
Likes: 0
Received 0 Likes
on
0 Posts
03-13-2012, 01:28 PM
#20
Senior Member
Join Date: 05-15-10
Location: South Charleston, WV
Posts: 3,997
Likes: 0
Received 2 Likes
on
2 Posts
Weird noise. Never had that issue with either of my TCs. Now when I had a bad leak in my piping on cold start ups it would make a noise sort of like that when it would about stall out.
03-15-2012, 10:59 PM
#22
Cobalt SS/TC cold start with a rattle/funky sound - YouTube
does it sound like this???
mine made this noise. i dropped it off at the dealership after about 2 weeks they replaced the tensioner/timing chains/cam actuators/cam phasors/timing chain guides.
noise is gone. once and a while i will hear the noise but not nearly as bad as the noise herd in the video.
does it sound like this???
mine made this noise. i dropped it off at the dealership after about 2 weeks they replaced the tensioner/timing chains/cam actuators/cam phasors/timing chain guides.
noise is gone. once and a while i will hear the noise but not nearly as bad as the noise herd in the video.
03-16-2012, 01:34 PM
#23
Senior Member
Join Date: 11-25-07
Location: St.Paul minnesnowta
Posts: 2,966
Likes: 0
Received 0 Likes
on
0 Posts
in that video my car was all stock besides muffler delete and a K&N drop in.
since that video ive gone GMS1,K&N typhoon and cat back. i dont hear the noise anymore cause i watch it closely when i warm my car up for a minute or 2 before heading to work.
damn K&N sounds like a jet on a cold start
Thread
Thread Starter
Forum
Replies
Last Post
Getaway_Driver
08-10 SS Turbocharged General Discussion
40
09-10-2015 09:11 AM