Rattling noise under car upon acelaration.. - Mustang Evolution

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Old 03-02-2013, 01:29 PM   #1
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Rattling noise under car upon acelaration..

I've noticed that my 1995 3.8 v6 makes a rattling noise under the right side of the car.it happens while taking of i can slightly hear it but when I'm driving up a pretty steep hill it becomes more noticeable.the last time this happen to my car my catalytic converter went out and I had to get it replaced,but the rattling was more aggresive to the point where ill take of from a red light you can hear a terrible rattling noise.im thinking my right catalytic converter might be going out(assuming i have one).any ideas?thank you
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Old 04-07-2013, 01:22 AM   #2
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Mine has been doing something similar...but only when the motor is under load like going up a hill or getting onto the freeway. Does it sound like a marble in coffee can?
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Old 04-07-2013, 06:28 PM   #3
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I've noticed this sound on my 2000 recently, it kind of sounds like a little piece of metal rattling against something big.
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Old 04-07-2013, 07:08 PM   #4
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Check your muffler and pipes
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Old 04-07-2013, 09:21 PM   #5
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Check for a crack in your manifold.
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Old 04-08-2013, 09:10 AM   #6
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Check heat shields and dust covers, if your cars a 5 speed check the little dust cover on the clutch fork, I scraped going into a steep driveway once and all kinds of s$%t started rattling.. it bumped the clutch dust cover and knocked the clamps on tail pipes off..

Also, tap on your cats with the engine off with the handle of a screwdriver or something, if you hear anything rattling chances are a cats bad..
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Old 04-08-2013, 05:07 PM   #7
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Sounds like its coming from the right rear of the car under slow acceleration after a stop. My exhaust is fine, can't find a problem with it.
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Old 04-08-2013, 11:48 PM   #8
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Mine sounds like its coming from the front passenger side when I'm climbing a steep hill, or getting on the throttle pulling out onto the road. It doesn't sound like the rattle is clanking in time with the motor, it's seriously like random rattling...a marble in a coffee can kinda sound. Couldn't find a crack in the manifold. Maybe the gasket?
The cats and mid pipe are all new-ish, so I'm pretty sure they aren't the issue.
Think it could be the timing?
*still scratching my head*
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Old 04-09-2013, 02:05 AM   #9
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Originally Posted by MustangShelly View Post
Mine sounds like its coming from the front passenger side when I'm climbing a steep hill, or getting on the throttle pulling out onto the road. It doesn't sound like the rattle is clanking in time with the motor, it's seriously like random rattling...a marble in a coffee can kinda sound. Couldn't find a crack in the manifold. Maybe the gasket?
The cats and mid pipe are all new-ish, so I'm pretty sure they aren't the issue.
Think it could be the timing?
*still scratching my head*
if it doesn't seem to go with the engine rpm id look at other things, check all your suspension and bushings. dust shields, stuff like that

---------- Post added at 02:05 AM ---------- Previous post was at 02:04 AM ----------

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Sounds like its coming from the right rear of the car under slow acceleration after a stop. My exhaust is fine, can't find a problem with it.
do you have dual exhaust? get under your car and look where your tail pipes loop up over your rear end, see if there's any marks on the inner loop of the pipe like it was rubbing on the axle.
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Old 04-09-2013, 06:00 PM   #10
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Yeah I have duel exhaust and I've checked the clearance around the axle area many times and their is a lot of space and no marks on the exhaust pipes of anything hitting.
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Old 04-09-2013, 06:43 PM   #11
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Yeah I have duel exhaust and I've checked the clearance around the axle area many times and their is a lot of space and no marks on the exhaust pipes of anything hitting.
Hmm, did you check your u joints? Does it make a difference how hard you hit the gas from a stop?
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Old 04-09-2013, 06:45 PM   #12
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Yeah I actually had those off a month ago and they are in good shape.
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Old 04-10-2013, 10:30 PM   #13
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I'm at a loss then man without hearing it with my own ears..

Is the sound kind of hollow? Or is more dull kinda solid?
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Old 04-10-2013, 11:01 PM   #14
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I had this problem with my jeep the cat broke apart on the inside
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Old 04-10-2013, 11:04 PM   #15
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I had this problem with my jeep the cat broke apart on the inside
What year jeep? Same thing with my 93 cherokee.. sounded horrible and it really only did it when I took off slow, should have seen it when I did straight side pipes and it shot pieces of red hot honeycomb out the side...
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Old 04-10-2013, 11:05 PM   #16
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It was a 94
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Old 04-10-2013, 11:13 PM   #17
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It was a 94
Id be willing to bet that's the OPs problem, at least to some extent.

I'm just glad I was in my driveway and not driving down road by kids or something when it finally let go..
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Old 04-11-2013, 05:35 PM   #18
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I'm at a loss then man without hearing it with my own ears..

Is the sound kind of hollow? Or is more dull kinda solid?
Yeah its a dull sound I can only hear with my windows down during a slow take off.
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Old 04-11-2013, 06:00 PM   #19
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Yeah its a dull sound I can only hear with my windows down during a slow take off.
Thats only when i could hear my cat rattling aftter i replaced it it went away
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Old 04-11-2013, 07:47 PM   #20
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Well if that's the case looks like I might need new cats soon lol.
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Old 04-11-2013, 07:53 PM   #21
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Well if that's the case looks like I might need new cats soon lol.
Smack on them with something hard and you should be able to hear rattling in them. Or have a friend get in and fire it up and rev slightly while you watch under and try to listen to pinpoint where the sounds coming from.. but if its just when you're driving it id look into the drivetrain components that are normally not in motion at idle.
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Old 04-14-2013, 11:31 AM   #22
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Smack on them with something hard and you should be able to hear rattling in them. Or have a friend get in and fire it up and rev slightly while you watch under and try to listen to pinpoint where the sounds coming from.. but if its just when you're driving it id look into the drivetrain components that are normally not in motion at idle.
Okay well it's not the cats, but the weird thing is I can't hear the sound I was hearing anymore. Well I don't know what it could have been but I'll have to listen if it comes back.
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Old 04-15-2013, 12:20 AM   #23
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Do you have any clamps on your exhaust anywhere? I had pipe clamps between my mufflers and tail pipes, and one got knocked loose on a driveway, it would rattle if I was at a stop and the rpm was just right, like, take my foot off the brake and get a 5 rpm difference and that affected it. I took the clamps and tails off and it went away. Might have also been the heat shield on your cats or the honeycomb and you might have jarred it when you knocked on them.. lol

Let us know how it goes man
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