Rattle Type Noise 2.4L

Exhaust heat shield vibrating against something? It's near the passenger side and noisy if something is touching it.

Ok I will let them know. My sound is coming from the front part of the motor also, forgot to mention that. It is really hard to explain...it almost sounds like a pulley noise or something like that. In an older car I had in the past, it sounded kind of like the same (almost like gravel rattling around on metal) and it was the waterpump, but I doubt it is that on such a new car. I noticed other posts about the heat shield, but they were also saying the noise came at higher RPMs also, mine is only at idle, but really only with a load on it. If i turn on the Climate Control, it gets louder, if I turn on the lights also, it gets even louder. I wondered if it was a faulty alternator or idler pulley. They ahve replaced upper idler pulley, but sound still there. I am at a loss, seeing as they can never seem to hear it when I am there. I am 3/4's deaf, and I can hear it clear as day.

Can you have the engine revved while listening around the altenator? It should still have the sound albeit small in comparison to the engine at revs if there is a problem with it. Maybe bearing or loose pulley?

Another possibility is the injectors. Our engines are mounted so the intake manifold is on the front along with the injectors and it can make a sound that some compare to that of a diesel at idle. On most transverse I-4's the exhaust manifold is in the front and the intake and injectors are in the rear so the sound of the injectors is muffled by the firewall and by being buried in the back of the bay. Just a thought.

I will try to take a closer listen when I have the car back. Have it in getting a touch up on the bumper where someone backed into me . Good thing is its a free repaint from the dealership as a "valued customer." Have to admit, my dealership is awesome and excellent customer service.

Are you using an OEM oil filter? Just woundering, I get alot of people using a non oem filters and get valve train nosie and engine knocking, whistle nosies and idle and crusing nosie from using non oem filters. Theres a TSB on that.

All of my work is done at the dealership with Manufacturer parts, so it wouldnt be that. But that is a good point forsure. Thank you for all of your help everyone. I am actually heading to my dealership today to pick it up, and the service advisor there is excellent and he called me today saying, I don't care what it takes, we will get to the bottom of it and get it fixed...they are definately on my side. I just hope they can hear the sound today when I am there...cross your fingers everyone.

^^
Crossing fingers...
hopefully they'll figure it out, plz don't forget to post up
what they do find when they fix it

Well of course, as life goes, when I had it at the mechanic, I was not able to reproduce the sound, but on a positive note, the touch up looks amazing. There is no possible way to tell...I was expecting just a better version of what I tried with the touch up pen, but when I picked it up, he had actually sanded down, primed, painted, clear coated...it looks like it was right off the factory line...so stoked . As soon as I have info on the rattle noise and fix, I will post on here for everyone. Thanks all.

Stuck lifter? did you check the oil? Hate to sound obvious....

I had a "mystery" rattle in my previous car (2002 Mitsubishi Eclipse) at idle with AC on. I discovered that the idle with AC on created a different engine vibration of the 2.4L causing the license plate and frame to rattle. 30 cents worth of nuts and bolts solved the problem. I hope your rattle is something this simple.

If you have it poke around the engine bay with a mechanics stethescope (not on spinning parts please) or you can use a heavy screw driver by placing the tip against (injectors, altenator, (housing only) valve cover) and see where the noise is loudest.
This will help isolate the noise.

Noticing the same sound on my new 2012 sx 6 speed. Only at idle do you really hear it. Car has less than 1800 km's. Did anyone figure out the problem would love some feed back!!! Or do I have to remove the same piece! Hard winters here and don't really wanna take it off, but I'm sure the sound will drive me nuts!

Koupgurl87 said:

Noticing the same sound on my new 2012 sx 6 speed. Only at idle do you really hear it. Car has less than 1800 km's. Did anyone figure out the problem would love some feed back!!! Or do I have to remove the same piece! Hard winters here and don't really wanna take it off, but I'm sure the sound will drive me nuts!

Click to expand...

Likely the injectors. Go listen to it.

Also our car has flat tappets so it's pretty noisy.

I know the thread is a year old, but there's 0 chance our cars can have sticky lifters. No lifters... and the tappets ain't hydraulic.

Hey I have the same problem as OP mentioned, especially when the A/C is on. I figured it was just a loose heat shield, Ill let the mechanics know when I take her in for service in a couple of weeks.

Noticed this was a older thread. Not meaning to high jack or anything. Can SXkoup tech be a little more specific on a tsb for using non OEM oil filters please. Wondering how this would cause a adverse affect on the engine oil system.
I've been changing oil in my cars for over thirty years and have never run across this problem before.

i've noticed the same sound but def. not as loud as your knocking. hm.....you've got me thinking now. I'll see what my mechanics say at the dealership.