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jdubgrand 01-21-2011 10:54 PM

rattle on acceleration
 
i have an 05 jeep grand cherokee limited 2wd 4.7 and when i accelerate i hear a rattling sound but its only when the car has been sitting for a few hrs or is cold and it only does it for about the firs 2 miles

Frankie 01-21-2011 11:15 PM

Re: rattle on acceleration
 
Where does it sound like its coming from?

jvs0302 01-21-2011 11:29 PM

Re: rattle on acceleration
 
I have a rattling sound that comes in between 2700-3000 rpms under moderate load. Its like clockwork. Brought it to Jeep dealer (under warranty), they said it was "normal driveline noise". BS, because when I bought the Jeep it never made that noise. Also took it to my local indy shop, they kept the Jeep for two days and could not locate the noise either..........but said it is definitely NOT normal.

To me it sounds like a simple exhaust heatshield rattle, but weve checked and everything is tight.

Anyway, not trying to thread hijack.........just wondering what the symptoms of your noise is. Does it make the rattle when you are in park and rev the engine? Or only under acceleration? What rpm's do you notice it? Knowing this might help you narrow down where the issue is.

jdubgrand 01-22-2011 05:36 AM

Re: rattle on acceleration
 
only on acceleration

ballajim 01-22-2011 12:16 PM

Re: rattle on acceleration
 
I have started having same issue, sounds like coming from front passenger side..only on acceleration and only ater sitting

Asativa 01-22-2011 02:04 PM

Re: rattle on acceleration
 
Sounds like the heatshield on ur catalytic converter is rattling. Very common, you can easily add an exhaust clamp to keep it quiet

dr.lee.baugh 01-24-2011 09:05 AM

Re: rattle on acceleration
 
I too have this same issue (metallic rattle on acceleration at around 2500 - 3500rpm). I have been up and down the exhaust with a rubber mallet, and have never been able to pin it down.

I've put approx. 45,000 miles on it since this started happening - so I've just learned to live with it.

jvs0302 02-18-2011 10:26 PM

Re: rattle on acceleration
 
Anyone have any updates on their rattling issues??

It is driving me absolutely insane. Ive taken it to the dealership I bought the Jeep from, and they state it is "normal drivetrain noises"........which is just bullshit.

I took it to an indy mechanic who I absolutely trust. He spent a good 7-8 hours on the truck, went up and down the underbody looking for anything that was loose and could not locate the rattle. He was so frustrated when he was done because he just couldnt figure it out.

I have been living with this for months but its really getting to me. A 2010 Jeep just shouldnt have this and it started with well under 20K miles on it.

Since I am under warranty, I am going to try another Jeep dealership and see how they do.

Anyone have any suggestions???

05wkguy 02-19-2011 03:43 PM

Re: rattle on acceleration
 
Possible engine detonation from a bad knock sensor? Should throw a code but maybe it's not totally malfunctioning.

xj31 02-19-2011 09:56 PM

Re: rattle on acceleration
 
Its probably the catalytic converter.I have seen this a few times.You can probaly brake torque it and get the noise to happen.You can use a rubber mallet and beat it like it owes you money and it won't make a sound.Get the right load on it and it will be constant.

jvs0302 02-20-2011 07:23 PM

Re: rattle on acceleration
 
Quote:

Originally Posted by xj31 (Post 359971)
Its probably the catalytic converter.I have seen this a few times.You can probaly brake torque it and get the noise to happen.You can use a rubber mallet and beat it like it owes you money and it won't make a sound.Get the right load on it and it will be constant.

i think you may be right. its only at a certain load that it happens, and if i hold it there i can almost get it to be constant. yet my indy said with a rubber mallet he couldnt here a thing. i just would hate to pay the money to replace it without knowing its a sure thing. im under warranty so i am gonna try another dealership and see if they are willing to replace it.

mitchelm 02-21-2011 04:30 PM

Re: rattle on acceleration
 
Yeah, mine does the same rattle. Only accelerating from a cold start or accelerating from 5mph or less. Not consistent at all. Sounds like its coming from behind the radio or ac/heating unit. But no idea. I too have checked all the heat shields, etc. everything is tight. I'll look at the catalytic converter when it gets warmer out.


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