Engine Rattle When Revving over 5k
 

Ok I got an A/T so lets get over that fact. But I've been noticing when I'm in manual mode and punch it I hear a weird rattle coming from the engine when I'm over 5k RPM. Sometimes its there and sometimes its not. But it's usually always in 2nd gear. It almost sounds like something is shaking loose. I only have 7k miles on the car. Has anybody experienced this before? Thanks for your input.

You should take it to the dealer whenever you get the chance.

Could it be a motor mount?

Any lose in power? There is a problem with the ATs in very warm weather having engine failure.

Does it sound like a ringing sound?

have them check the motor mount .. The wifes 8 had a little viberation when she stoped ,came through the steering wheel

Does it sound like paper rustling? Cuz I have that sometimes too, but only when I bring it up to 5-9k on the first time I punch it. I thought it was my body kit making that noise because it tends to rattle a bit. But now the more I think about it, it seems to be the draining/circulation of fluids. I had the same sound when I start up the car sometime during the summer.

Is it related to the engine tempeture? If it is, it may just be some relays opening up as the car warms up. I would still have the dealer check it out though.

probably just the intake, but have it checked if your worried.

get your pcm reflashed the same thing use to happen in my AT. The dealer sent the pcm to california to be recalibrated. It fixed the problem. Trust me you need a reflash. It sounds like marbles in a blender.

Thanks
 

Your right it does sound like marbles in a blender. I'm due for my first service so I'm going to take it in this weekend. Thanks for all your help guys.

Tell me how it goes. I get the 'marbles in a blender' sometimes too.

marbles in a blender sounds like detonation based on my rotary history... hopefully not tho.

^ I got a new engine because of knock while using 87 octane. If you are using 87 octane switch to 91 and see if that helps.

I use 93 :dunno:

I wouldn't say it's from the engine, I know it's under the hood, but it sounds like a piece of metal somewhere that just rattles. Again, only sometimes.

bump...argh...

I did a search on this...not too many results...

And I really don't have the patience to go see the dealer, AND to explain to them, because it only really seems to happen under hard acceleration. I also haven't been worried too much about it, because again, it only happens sometimes, and it doesn't sound like anything 'significant' because there's no loss in power (i held up with mustangs, if that serves as proof)

/end rant, bleh, I need sleep

Tried it out this morning...I get the rattle around 8000 rpms.

Anyone?

Well, at least its not losing any power and it seems that a few people have the same problem (if it is a problem). Like someone said, it could be the air flow. Either way, I know that a dealer here will be hesitant to fix somethng that you can barely feel or see. I'm not too worried about it cuz I accelerate slowly through the RPMs and then do it again faster, I don't hear it. Strange.

Could be pinging. Using premium gas?

True story: I owned an older Mustang that ONLY ran on premium. If I put any lower octane in it would ping like crazy. Every so often I would buy premium gas and the engine would ping. This told me that the gas station was "watering down" its premium with regular - crooks.

Went to the dealership...they said it could be the gas I'm getting from my particular gas station, and to empty the tank out and try 2 tanks from a better gas station they recommended (mobil), and see how that works out. They said even though it's 93 octane, it could still be bad gas.

They had the same problem with another rx8 in the area, and they drained the tank, put it premium gas and it was fine.

Watering down their premium? Interesting.

So does yours sound like paper rattling? That's the best metaphor that I can think of cuz its not as loud as marbles in a blender. Anyway, thank for the info!!

paper crumbling, yea kinda

Does it sound like fighting racoons???:)

bump

Paper rustling? From under the hood. Hmmm, never had that. I did have a terrible rattle that sounded partially like paper rustling, partially like something slapping the passenger side of the car. Turned out the moonroof wind deflector was loose and rattling. Scratched a horrible wide horseshoe into my roof.
:cussing:

SlowLude, you're getting this sound with or without a CEL? Real detonation ought to throw a CEL.