Another "what is this noise" thread
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Another "what is this noise" thread
This is on a new Asheville engine with less than 2000 miles. Noises are hard to describe, but I suspect this one will pretty easy to diagnose since it's so reproducible. The engine purrs like a kitten at idle and otherwise runs great. I don't know that this is an engine problem at all.
Only at highway speeds (60+) and never any slower, there is a spinning, grinding type of sound that occurs every time I let off the throttle. It's loud enough that anybody can easily hear it. It will last 5 or so seconds. I can stop the noise instantly by reapplying the throttle and restart it by letting off again and I can do that all day long. It seems to me that something disengages when I let off and reengages when I reapply the throttle. What the heck is this noise?
Only at highway speeds (60+) and never any slower, there is a spinning, grinding type of sound that occurs every time I let off the throttle. It's loud enough that anybody can easily hear it. It will last 5 or so seconds. I can stop the noise instantly by reapplying the throttle and restart it by letting off again and I can do that all day long. It seems to me that something disengages when I let off and reengages when I reapply the throttle. What the heck is this noise?
Hotshot
Joined: Apr 2010
Posts: 19,073
Likes: 243
From: Saratoga Springs,UT
I have a grinding noise and its Horrible sounding but its off and on all the Time stopped or driving
Mine is an exhaust leak it will do it at idle stopped off and on and I can push on the exhaust and it would stop Im missing a clamp at a joint on tailpipe
Hearing my grinding sound you would think the engine is tearing itself apart but just an exhaust leak
I would think if it was engine you could create the sound at a certain RPM but you never know with these type things
Something to think about
Mine is an exhaust leak it will do it at idle stopped off and on and I can push on the exhaust and it would stop Im missing a clamp at a joint on tailpipe
Hearing my grinding sound you would think the engine is tearing itself apart but just an exhaust leak
I would think if it was engine you could create the sound at a certain RPM but you never know with these type things
Something to think about
Thread Starter
|
Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
I have a grinding noise and its Horrible sounding but its off and on all the Time stopped or driving
Mine is an exhaust leak it will do it at idle stopped off and on and I can push on the exhaust and it would stop Im missing a clamp at a joint on tailpipe
Hearing my grinding sound you would think the engine is tearing itself apart but just an exhaust leak
I would think if it was engine you could create the sound at a certain RPM but you never know with these type things
Something to think about
Mine is an exhaust leak it will do it at idle stopped off and on and I can push on the exhaust and it would stop Im missing a clamp at a joint on tailpipe
Hearing my grinding sound you would think the engine is tearing itself apart but just an exhaust leak
I would think if it was engine you could create the sound at a certain RPM but you never know with these type things
Something to think about
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
It happens with the AC on or off. I'll watch the FSS on the scan gauge closer, but I don't think it varies when it happens. Tensioner was my thought but my mechanic thinks it would do it even at idle if it was.
Senior User
Joined: Aug 2015
Posts: 139
Likes: 0
From: Virginia
do you have a cai ? I have a "grinding" noise in mine since adding the cai. It is caused by the increased air flow and turbine of the turbo. And I can make it come and go like you. Gets louder when off throttle.....
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
I do, and considered that as well. However, I've had it nearly 10 years with no issue. The new engine may be the difference. Any idea how to prove/disprove/eliminate that as an issue?
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Senior User
Joined: Aug 2015
Posts: 139
Likes: 0
From: Virginia
I had the powermax turbo in and it was very loud. I have put my stock turbo back in to get my low end back and have noticed it's alot quieter with it. Aside from putting in the stock air intake I am not sure how else you could prove it.
If you reused your turbo, did you clean it prior to install? Could be the new motor just is throwing out more carbon during break in and is causing the veins to stick a bit too... hope this helps!
If you reused your turbo, did you clean it prior to install? Could be the new motor just is throwing out more carbon during break in and is causing the veins to stick a bit too... hope this helps!
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Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
I had the powermax turbo in and it was very loud. I have put my stock turbo back in to get my low end back and have noticed it's alot quieter with it. Aside from putting in the stock air intake I am not sure how else you could prove it.
If you reused your turbo, did you clean it prior to install? Could be the new motor just is throwing out more carbon during break in and is causing the veins to stick a bit too... hope this helps!
If you reused your turbo, did you clean it prior to install? Could be the new motor just is throwing out more carbon during break in and is causing the veins to stick a bit too... hope this helps!
Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
On mine the torque convertor will unlock as soon as I left off the accelerator pedal and will re-engage when I get back on, although there is usually a small delay before it re-locks. Easy to tell watching the tachometer.
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Transmission related since it went away in a different gear? Maybe torque convertor lockup clutch?
On mine the torque convertor will unlock as soon as I left off the accelerator pedal and will re-engage when I get back on, although there is usually a small delay before it re-locks. Easy to tell watching the tachometer.
On mine the torque convertor will unlock as soon as I left off the accelerator pedal and will re-engage when I get back on, although there is usually a small delay before it re-locks. Easy to tell watching the tachometer.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Can you narrow it down to the area? If it sounds like its in the Trans area and by what you described and the engine has been out, I'd double check all the torque converter to flywheel bolts.
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
I hope that's true. I have another thread going on driveshaft issues and it would sure be nice for this to all be solved by fixing one issue. I know that the pinion angle is off. It has all new u-joints already. I've decided to replace the whole assembly with a one piece shaft rather than spend all the time and money try to tweek which one of those parts may be the problem.