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Old 08-18-2012, 10:50 AM   #1
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weird grind. help please!

So when my car is cold and I hit 3k rpm I get a quick jolt grind that dissapears after a split second, now when the car is up to normal temp it will occasionally make the grinding noise at about 4k rpm same thing just for a split second than disappears, any ideas what could cause this ? It's driving me crazy! Appreciate any help thanks guys.
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Old 08-18-2012, 10:53 AM   #2
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Quote:
Originally Posted by NJstanger
So when my car is cold and I hit 3k rpm I get a quick jolt grind that dissapears after a split second, now when the car is up to normal temp it will occasionally make the grinding noise at about 4k rpm same thing just for a split second than disappears, any ideas what could cause this ? It's driving me crazy! Appreciate any help thanks guys.

Whats done to your mustang and auto or standard ?
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Old 08-18-2012, 10:54 AM   #3
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Re: weird grind. help please!

Maybe power steering pump? Bad belt tensioner? Have somebody listen with the hood up while u start it.
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Old 08-18-2012, 11:19 AM   #4
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Pretty much stock, 5 speed manual....it can't be heard when started, if I rev it up it doesn't grind it has to be driving

---------- Post added at 12:19 PM ---------- Previous post was at 12:08 PM ----------

I'm new to the world of working on cars but trying to get there , so please bare with me if I get a little lost
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Old 08-18-2012, 01:46 PM   #5
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Quote:
Originally Posted by NJstanger
Pretty much stock, 5 speed manual....it can't be heard when started, if I rev it up it doesn't grind it has to be driving

---------- Post added at 12:19 PM ---------- Previous post was at 12:08 PM ----------

I'm new to the world of working on cars but trying to get there , so please bare with me if I get a little lost
Is it a loud grinding noise? Where does it sound like its coming from. Since its only doing it while driving it may be a chattering clutch or failing throw out bearing. I just replaced my clutch and bearing but before it would make a slight grinding noise while in gear and driving and got worse at higher speeds.
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Old 08-18-2012, 07:30 PM   #6
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Quote:
Originally Posted by Arron's racecar

Is it a loud grinding noise? Where does it sound like its coming from. Since its only doing it while driving it may be a chattering clutch or failing throw out bearing. I just replaced my clutch and bearing but before it would make a slight grinding noise while in gear and driving and got worse at higher speeds.
Hmm I'd say yes it's noticeable inside with windows closed so it's gotta be a bit loud, the TOB could be it, I had a noisy TOB when the clutch was out and it went away when I pressed the clutch in, well I adjusted my clutch with the help of another member and the TOB stopped squeaking but the grind is still there, the grind has always been there even before I adjusted the clutch.
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Old 08-20-2012, 08:04 AM   #7
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Bump
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Old 09-17-2012, 05:29 PM   #8
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Re: weird grind. help please!

any ideas? still doing this? could it be with TOB? never heard of a TOB making a metallic grind noise
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Old 09-17-2012, 08:09 PM   #9
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Is it only when you're driving? And never sitting still?
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Old 09-17-2012, 08:33 PM   #10
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Is it only when you're driving? And never sitting still?
Yes! At the specific rpm range, a little over 3k when cold, and sometimes a little over 4k when up to temp.
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Old 09-17-2012, 10:58 PM   #11
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Need more details. Try to describe it as best u can. Is it loud enough u could make a recording? Is it a metalic grind or a low grumble or? Does it jerk the car or do u feel a slight pull? Try to describe it so someone who has never heard it before would know exactly what u mean. Compare it to something. Also has it gotten worse? Did anything significant happen just before you started hearing it? Any ditail you can think of might help us.
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Old 09-18-2012, 07:05 AM   #12
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Quote:
Originally Posted by irishn8
Need more details. Try to describe it as best u can. Is it loud enough u could make a recording? Is it a metalic grind or a low grumble or? Does it jerk the car or do u feel a slight pull? Try to describe it so someone who has never heard it before would know exactly what u mean. Compare it to something. Also has it gotten worse? Did anything significant happen just before you started hearing it? Any ditail you can think of might help us.
I can probably get a recording but has to be first thing in the morning when it's dead cold I will try the next few days....IT IS a metallic grind not a grumble or anything, DOES NOT jerk or pull the car, its not the type of noise it makes when you grind a gear
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Old 09-18-2012, 07:21 AM   #13
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Here's a theory: when you park the car for the evening and come to a stop, the brakes are applied-the brake pads are compressed against the rotors. Maybe the calibers are not releasing as they should and the pads are not in the best shape and creating the grinding sound you hear when the car is in motion. Bad brake pads makes a grinding sound as they carve into the rotors. Just a thought...
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Old 09-18-2012, 08:20 AM   #14
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Quote:
Originally Posted by 02 360R
Here's a theory: when you park the car for the evening and come to a stop, the brakes are applied-the brake pads are compressed against the rotors. Maybe the calibers are not releasing as they should and the pads are not in the best shape and creating the grinding sound you hear when the car is in motion. Bad brake pads makes a grinding sound as they carve into the rotors. Just a thought...
Hmmm I do believe I have something going on with my front brakes too but would the brakes grind ALWAYS at that specific rpm range, I'd just find it a bit weird if it always grinds at a certain rpm range when cold than a certain rpm range when up to temp
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Old 09-18-2012, 11:00 AM   #15
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Originally Posted by NJstanger

Hmmm I do believe I have something going on with my front brakes too but would the brakes grind ALWAYS at that specific rpm range, I'd just find it a bit weird if it always grinds at a certain rpm range when cold than a certain rpm range when up to temp
I don't know. That is strange to hear it at certain RPMs. Maybe it is something else. Check your moving parts. Water pump, alternator, etc... anything that moves. Maybe the higher RPMs causes stress on one of those parts and makes the grinding sound. Just a thought...
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Old 09-18-2012, 11:23 AM   #16
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Re: weird grind. help please!

Is it making the noise at the RPMs you mentioned under load, meaning your getting on it?

---------- Post added at 12:23 PM ---------- Previous post was at 12:20 PM ----------

If will not necessarily repeat if you were to slowly increase your RPMs, but it will if you get on it, it could be your clutch slipping some and chattering.
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Old 09-18-2012, 12:34 PM   #17
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Originally Posted by Azure
Is it making the noise at the RPMs you mentioned under load, meaning your getting on it?

---------- Post added at 12:23 PM ---------- Previous post was at 12:20 PM ----------

If will not necessarily repeat if you were to slowly increase your RPMs, but it will if you get on it, it could be your clutch slipping some and chattering.
I'm pretty sure it does it either way, if I get on it or if I'm just slowly accelerating but when I hit the rpm range it does it, but I will have to re check when I get home,when I'm off work the car will be very cold so I will take it out and let you know..but from what I remember it does seem to sound a lot worse when im really getting on it.
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