Annoying sounds, please help

[nickgt5.0]

When i hit high rpm's there is this nasty noise of what sounds someone is shaking a key ring with a bunch of keys hitting each other, its not a consistent sound. Sounds like metal is broken or loose and rattling around somewhere. has anyone ever had this problem or ever heard of anything like it?

 

[cbarr300]

detonation?

 

[nickgt5.0]

damn i hope not

 

[cbarr300]

sound like a can of marbles?

prolly going lean up top.

quick test: lug it in 5th gear and see what you get.

If it doesn't do it while lugging the engine, then there's a chance your fuel pump or something in your fuel system is messed up.

it could also help to clean your maf

good luck

 

[BlownFiveLiter]

Do you have cats? Could be one of the heatshields rattling if you do. I ended up getting some huge hose clamps from like Home Depot when I still had my stock H on there, so they'd stop rattling around.

 

[RAD]

Do you have cats? Could be one of the heatshields rattling if you do. I ended up getting some huge hose clamps from like Home Depot when I still had my stock H on there, so they'd stop rattling around.

yep

 

[nickgt5.0]

well i just bought a offroad h a couple days ago and its being shipped. but you can sometimes hear it in 5th but its way louder around 5000 and yeah it sounds like a can of marbles.

 

[greenstang1313]

how many miles are on your motor? Are you sure that these noises arent just normal 5.0 sounds? Its scary what you hear from the engine when you go WOT in a high mileage 5.0 that has stock exhaust....

 

[mustang6tee8]

tell us what aftermarket parts you have. sometimes they arent made to fit exactly as original parts and could be vibrating against something. for example, my 2 1/2" JBA catback is vibrating against the framerail over the axle on the driver's side.

 

[nickgt5.0]

all stock except cai, puttin in H pipe this coming week though so its nothing like that. and the noise definatley isnt normal 5.0 noise.

 

[BlownFiveLiter]

Toss your front end on jackstands or ramps, CHOCK YOUR REAR TIRES and SET THE PARKING BRAKE (don't wanna lose ya to the car falling off) and listen for the sounds under the car. I'm still betting on the heatshields rattling, but they're near impossible to isolate from inside the car.

 

[nickgt5.0]

installed H pipe, noise is 99% gone, may have been the heatshields, not sure, thanks for your input

 

[BlownFiveLiter]

Good to hear that your problem is solved. Does the little bit of noise that you still have sound the same as it did prior to the swap? It's possible that something is still rattling around, but the heatshields were also adding to it, making it seem that much worse.

 

[nickgt5.0]

well yeah its so hard to hear now and it only like hits once. so im just gonna say its gone ha it basically is.

 

[nickgt5.0]

well im still hearing the sound. damn i wanna figure it out and fix it. so annoying when your trying to race or show off and you have this gnarly noise.

 

[BlownFiveLiter]

Did you ever isolate where the noise was coming from?

 

[trav_19]

embarring is when im cruising thru town with my trans whinning....

since it dissapeared after the o/r pipe temperarilly i would say get under your car make sure all your exhaust is still tight and nothing loosened up then check to see if your pipes are unusally close to anything

 

[nickgt5.0]

yeah i dont think it was gone for a little while once i put o/r h on i think i was just wishing... i think it has nothing to do with exhaust. its coming from the engine area..

 

[1TallMF]

I'm willing to bet its detonation. Whats the timing set at and what octane gas are you running? As mentionned previously, clean the Maf and see if it helps and try running 91 or 94 octane for a tank (unless you already are) and see if it changes anything.

 

[nickgt5.0]

yeah ive always put premium in which is 92 here. ill go ahead and clean the maf