Chirping noise from engine on 996
#1
Chirping noise from engine on 996
http://youtu.be/575JKEOZBNc.
Hi, I have read through the forum to see if anyone else has the same or similar problem but as yet I am at a loss and so is my local OPC. Above is the address for the video of the chirping noise and apologies for the erratic videoing. This chirping noise has been going on for months as it was initially suggested by my OPC that it sounded like a pulley on the water pump. Today it went in to the OPC for what was supposed to be a water pump replacement but alas they confirmed this wasn't the problem and they were at a loss to diagnose what other than it was coming from the left bank side of the engine. They ruled out IMS, AOS and Serpentine and suggested that until they got inside the engine and even then no guarantees, would they no what the problem is but so far its a head scratcher.
I should note that the noise stops on long runs when the engine is really up to temp and there are no diagnostic issues, it doesn't use much oil and touch wood, runs sweetly.
Any help suggestions would be greatly appreciated.
Thanks,
D
Hi, I have read through the forum to see if anyone else has the same or similar problem but as yet I am at a loss and so is my local OPC. Above is the address for the video of the chirping noise and apologies for the erratic videoing. This chirping noise has been going on for months as it was initially suggested by my OPC that it sounded like a pulley on the water pump. Today it went in to the OPC for what was supposed to be a water pump replacement but alas they confirmed this wasn't the problem and they were at a loss to diagnose what other than it was coming from the left bank side of the engine. They ruled out IMS, AOS and Serpentine and suggested that until they got inside the engine and even then no guarantees, would they no what the problem is but so far its a head scratcher.
I should note that the noise stops on long runs when the engine is really up to temp and there are no diagnostic issues, it doesn't use much oil and touch wood, runs sweetly.
Any help suggestions would be greatly appreciated.
Thanks,
D
#6
does the noise vary with engine RPM, or only occur at idle? Sounds silmilar to when the idler pulley on mine started to go. It eventually turned into a aweful grinding noise that sounded like my motor was self destructing. I'd take it somewhere else to get another opinion (and don't tell them what's been looked at already) before tearing into the motor.
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#8
http://youtu.be/575JKEOZBNc.
Hi, I have read through the forum to see if anyone else has the same or similar problem but as yet I am at a loss and so is my local OPC. Above is the address for the video of the chirping noise and apologies for the erratic videoing. This chirping noise has been going on for months as it was initially suggested by my OPC that it sounded like a pulley on the water pump. Today it went in to the OPC for what was supposed to be a water pump replacement but alas they confirmed this wasn't the problem and they were at a loss to diagnose what other than it was coming from the left bank side of the engine. They ruled out IMS, AOS and Serpentine and suggested that until they got inside the engine and even then no guarantees, would they no what the problem is but so far its a head scratcher.
I should note that the noise stops on long runs when the engine is really up to temp and there are no diagnostic issues, it doesn't use much oil and touch wood, runs sweetly.
Any help suggestions would be greatly appreciated.
Thanks,
D
Hi, I have read through the forum to see if anyone else has the same or similar problem but as yet I am at a loss and so is my local OPC. Above is the address for the video of the chirping noise and apologies for the erratic videoing. This chirping noise has been going on for months as it was initially suggested by my OPC that it sounded like a pulley on the water pump. Today it went in to the OPC for what was supposed to be a water pump replacement but alas they confirmed this wasn't the problem and they were at a loss to diagnose what other than it was coming from the left bank side of the engine. They ruled out IMS, AOS and Serpentine and suggested that until they got inside the engine and even then no guarantees, would they no what the problem is but so far its a head scratcher.
I should note that the noise stops on long runs when the engine is really up to temp and there are no diagnostic issues, it doesn't use much oil and touch wood, runs sweetly.
Any help suggestions would be greatly appreciated.
Thanks,
D
A suggestion: You really should arrange to get the car in the air safely and arrange to get under the car with a stethescope (or with a mechanic who has one) and give a listen to narrow down the source of the noise.
Now not only do you use your ears, you use your nose to detect any smell of a leaking exhaust. It may have a bit different odor than the exhaust from the exhaust outlets, depending upon where the leak is and how severe it is.
You can see if you can spot the leak by using a feather.
Buy a feather duster and use a feather to run it along side but avoid touching the feather to the hot exhaust and see if you can spot the feather react (flutter?) when it passes through/by the exhaust leak.
If you touch the feather against the hot exhaust just toss it and grab another.
(As an aside: to find leaks in high pressure/high temperature (hundreds of PSI and hundreds of degrees above boiling) steam piping such as are found in ship propulsion systems instead of a feather a wooden broom stick is used. When the broom stick is passed through the leak the steam cuts through the stick like a band saw blade.)
But before you do the feather test you need to get the car in the air and pinpoint as close as possible to where the noise is coming from. You might get lucky and find the source without having to use a feather.
Sincerely,
Macster.
#9
For a new one I thought maybe a motor mount till I listened to the video. Since the noise increases "when the vlave covers are viewed" it made me think uh oh miners trapped in thee trying to pick axe their way out. But trying to think easy fix it could still be the motor mount <crossed fingers>. Just because the video shows the valve area doesn't mean it isn't reflecting off of parts in there or noe being transmitted through metal paths.
My seat of the pants estimate of rpm and valve activation tells me its 700rpm/30=23.3 intake or exhaust manipulations per second. Not like that matters to a gummed up or collapsing lifter.
Since it sounds like a chirp there is exhaust bracket loose hint hint, internal exhaust loose instead or rattling its rubbing its dry metal chirping, and plain old proof the end of the world really is coming this winter
I'd go simple with the engine cold checking header bolts and exhaust for tightness by first trying to move then trying a slight tightening of each and every bolt you can get to. Even the hangers.
Good luck with it not being internal.
My seat of the pants estimate of rpm and valve activation tells me its 700rpm/30=23.3 intake or exhaust manipulations per second. Not like that matters to a gummed up or collapsing lifter.
Since it sounds like a chirp there is exhaust bracket loose hint hint, internal exhaust loose instead or rattling its rubbing its dry metal chirping, and plain old proof the end of the world really is coming this winter
I'd go simple with the engine cold checking header bolts and exhaust for tightness by first trying to move then trying a slight tightening of each and every bolt you can get to. Even the hangers.
Good luck with it not being internal.
#13
(As an aside: to find leaks in high pressure/high temperature (hundreds of PSI and hundreds of degrees above boiling) steam piping such as are found in ship propulsion systems instead of a feather a wooden broom stick is used. When the broom stick is passed through the leak the steam cuts through the stick like a band saw blade.)
#14
BTW- thanks for the response!