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Old 11-24-2010, 04:05 PM   #1
ZepSL2
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Default help with metal on metal noise at 1.5 to 2.0 RPM

2000 SL2

ok so I fixed the wheel bearing last week so now i want to fix the other thing that is driving me nuts. When i accelerate i hear a loud metal on metal clanking/taping/banging/clicking sound ONLY in 1500 RPM to 2000 RPM range. The car drives great. 34 MPG highway etc... I thought it was the heat shield under the driver side since it was loose and touching the cat. Fixed it but no go. i checked all exhaust and it is secure. Anyway I am unable to locate what is making this noise. It only occurs when giving gas and is the worst when going up hill.

Now my next thought is maybe the motor mounts? or bad trans mount? but the strange thing is it only does this after the car is warmed up. (about 10 minutes) before the car is warmed up no sound at all. This was also why i thought exhaust. I figured maybe when cold, the metal was still contracted and not able to bounce around etc... but now i am thinking MAYBE a richer cold fuel mixture changes the vibration pattern/ RPM range of vibration?

oh i even had my brother stand on the road side as i drove by UP HILL to try and locate it but no luck other than "Sounds like it is coming from engine compartment" lol


thoughts?


thanks!!!
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Old 11-24-2010, 04:14 PM   #2
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1997 SL2
Default Re: help with metal on metal noise at 1.5 to 2.0 RPM

Perhaps you need new brakes? Sometimes they'll make a metal on metal sound like the train on its tracks...
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Old 11-24-2010, 09:23 PM   #3
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2003 L-Series 3.0L Sedan
Default Re: help with metal on metal noise at 1.5 to 2.0 RPM

Serpentine belt tensioner worn out and hitting its end stop with a stretched/ floppy belt? If the belt flops around in a blur or depresses easily with your fingers, the tensioner is worn out. Replace the tensioner and belt.
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Old 11-24-2010, 10:02 PM   #4
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Default Re: help with metal on metal noise at 1.5 to 2.0 RPM

Do you hear it when you rev it up to those numbers when the car is not moving?
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Old 11-27-2010, 09:18 AM   #5
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Default Re: help with metal on metal noise at 1.5 to 2.0 RPM

Quote:
Originally Posted by fdryer View Post
Serpentine belt tensioner worn out and hitting its end stop with a stretched/ floppy belt? If the belt flops around in a blur or depresses easily with your fingers, the tensioner is worn out. Replace the tensioner and belt.

the belt is new I put it on myself 10K miles ago. it was not loose then
and last time i checked it was all tight etc... and it did this before and after the new belt.

I will take a closer look and make sure though. thanks

Last edited by ZepSL2; 11-27-2010 at 09:28 AM.
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Old 11-27-2010, 09:21 AM   #6
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Default Re: help with metal on metal noise at 1.5 to 2.0 RPM

Quote:
Originally Posted by madpogue View Post
Do you hear it when you rev it up to those numbers when the car is not moving?
only when under load. just sitting there in park reving does nothing.

now that i think about it the trans needs to be engaged so the load does
not have to be much BUT whatever the problem it is 10 times worse when say
going up a steep hill and i hit the 1.5 to 2.0K RPM range vs say coasting down a hill and then i hit the gas in that range.

it only does this the when the car is warmed up. The first 10 minutes of driving it is all fine. interesting huh

Last edited by ZepSL2; 11-27-2010 at 09:34 AM.
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Old 11-27-2010, 09:24 AM   #7
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Default Re: help with metal on metal noise at 1.5 to 2.0 RPM

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Originally Posted by adventureoflink View Post
Perhaps you need new brakes? Sometimes they'll make a metal on metal sound like the train on its tracks...
except it only does it when giving gas and in the 1.5 to 2.0 RPM range
and that the brakes rotor and pads are all new and it did it before the new parts and after etc...
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Old 11-27-2010, 09:36 AM   #8
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Default Re: help with metal on metal noise at 1.5 to 2.0 RPM

Quote:
Originally Posted by ZepSL2 View Post
the belt is new I put it on myself 10K miles ago. it was not loose then
and last time i checked it was all tight etc... and it did this before and after the new belt.

I will take a closer look and make sure though. thanks
just remembered that it only does this the when the car is warmed up. The first 10 minutes of driving no noise at all which is one thing that really has me perplexed.
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Old 11-27-2010, 10:05 AM   #9
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Default Re: help with metal on metal noise at 1.5 to 2.0 RPM

Search the threads for pictures of worn out upper motor mounts where you can put your finger through the opening.
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Old 11-27-2010, 07:27 PM   #10
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1997 SL2
Default Re: help with metal on metal noise at 1.5 to 2.0 RPM

Quote:
Originally Posted by ZepSL2 View Post
except it only does it when giving gas and in the 1.5 to 2.0 RPM range
and that the brakes rotor and pads are all new and it did it before the new parts and after etc...
Alrighty, forget I said anything @ new brakes.

Was gonna say, all the times I got metal on metal when it was related to brakes, I was in motion one way or the other
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97 SL2
DOB: 3/19/97
Date Obtained: 5/30/07
Status: Alive, 1/2 exhaust

2004 Merc G.Marquis GS
DOB: 2/4/04
Date Obtained: 7/6/12
Status: Alive, no heat
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