2002 Mustang GT Engine rattle - Ford Mustang Forum
 
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Old 06-12-2010 Thread Starter
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2002 Mustang GT Engine rattle

Just wondering if anyone can help identify the rattle I am getting from my engine. It seems to always be there but I can't really hear it when I am actually driving because it's not that loud. It seems to be coming from the passengers side of the engine (maybe internal? or from one of the pulley wheels??) The cadence of the rattle goes up when I rev the engine but it does not get louder... just faster.
I have posted a video of it... its kinda hard to hear but if someone would take a look at the vid and let me know what you think that would be great.

YouTube - 02 Mustang GT engine rattle

Thanks!

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Old 06-12-2010
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did you just change your oil recently, if so it could be the oil weight

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Old 06-13-2010
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My timing chain tensioner arm on my 2003 broke in half recently, sounds very similar.

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Old 06-13-2010 Thread Starter
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Oil was changed about 2500mi ago.

Is there a way to tell if the arm is bad? are we talking like cracking or what?
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Old 06-13-2010
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thats not a spun bearing on one of the pullies? take a long flathead and put it ontop of the bolt holding on the pulleys and you can hear a difference if u put ur ear on the end of the flathead
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Old 06-13-2010
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i wanna say thats what my engine sounded like before i swap'd the engines, but that was 2 years ago when the original engine ran
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Old 06-14-2010
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A quick way to see if it is one of the pullies is to remove the belt and start the car. See if the noise is still there, if it is not then you have isolated it to one of the pullies and/or its assesory.

And no running the car a little bit w/o the belt will not hurt it just do not over heat it

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Old 06-14-2010 Thread Starter
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NM... answered my own question

Last edited by elbarto; 06-14-2010 at 08:13 PM. Reason: oops
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Old 06-15-2010 Thread Starter
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OK... so I pulled the belt off and ran the engine... noise is gone. Now, how to I figure out which accessory is making the noise. Just from looking at it I think it seems to be from either the belt tensioner or the little belt idler.
I tried the screw driver method and I am not quite sure it is making a difference...

would this be a good time to install some underdrive pulleys or is it more likely to be one of the accessories itself?
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Old 06-18-2010 Thread Starter
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anyone?


Bueller?
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Old 06-20-2010 Thread Starter
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Update... did the whole screw driver thing and I thought it was the idle pulley on the top pass side of the engine or the pulley on the tensioner arm. Replaced both this morning and the sound still persists. I did the screw driver thing again and the sound only seems to be coming from the idle pulley.... I took the belt off again and the sound went away. I don't get it... I replaced the pulley and the sound is still there!

Any ideas?
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Old 06-26-2010 Thread Starter
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Does anyone know how to tell if the tensioner arm is the thing causing problems? I replaced the pulley on it but that did not help.
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Old 06-26-2010
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If the tensioner arm is bad, you'll see it jumping around a lot when the engine is running. It's not uncommon for the tensioner to go bad either.

It's good to see that you've narrowed down the problem, now you just have to isolate it and kill it.

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Old 07-01-2010 Thread Starter
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Not seeing any real abnormal movement from the belt so I don't think it is the arm itself. A friend thinks that it might be the barrings on the AC pulley. Would a normal autoparts store carry a ac pulley? Also, how do I go about getting it off, I hear you need a special tool and what not.
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Old 07-04-2010 Thread Starter
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Turns out it was the barrings on all three of the idle pulleys... Sound had lessened some after replacing the first two smooth ones and I got it to go away completely after replacing the final grooved one.

Thanks for the help everyone!

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