yardpro

So my wife has been driving my 928 for a llittle over a week while i was working on her pos xj8.

I get in the car today and take it for a drive down to cedar island (awesome drive is anyone is down this way).

I noticed the sound in town at first. When i would accelerate hard sometimes it would begin making a " sheet metal flapping" sound. the "flapping" was not dependent on motor rpm, and would "flap" on irregular rhythms.

It would not do it every time, but sometimes. The noise would last until i slowed down.

I swore it sounded like i had one of those thin strips of sheet metal that the hvac guys use to hang ducts caught under my car. It sounded like it was flapping and hitting the asphalt.

I continued the drive and made a high speed run. as i slowed i could hear it again exactly the same sheet metal flapping sound. Again i got out and looked under the car and nothing....

got back on the road and it was gone

any ideas where to start looking?

Speedtoys

Heat shields under the car/around exhaust..front to back.

yardpro

i could reach the ones under the seat and they were firm.. could it be the ones above the bellhousing tunnel?

jleidel

Check your spoiler mounts and all the heat shields. Could be any of them. They get greasy and loose sometimes... just like college, but it takes jack stands instead of vodka to get under a 928.

Speedtoys

Dunno. Sounds like your inspection under the car is incomplete.



Jack it up. Lots of heat shields under there.

Thin metal..like what you would find in AC systems in buildings.

depami

I vote for checking spoiler, belly pans, etc. Something that tore loose when she bottomed it out. She did tell you about that, right?

yardpro

lol... no she did not tell me about that..but i have my suspicions....

i will be getting it in the garage and up in stands tomorrow....

looks like i will be doing my trans fluid/filter change as well.

Dean_Fuller

Check brake dust shields too. Exhaust touching somewhere.

yardpro

since i just did the brakes, i thought of the shields also... could reach them between the wheel spokes...nice and tight..

this is not a fast vibrating noise like something is touching.. it sounds like a flapping... slower and not rhythmic...

i will hopefully find out tomorrow.

Mrmerlin

from the info I would guess that its one of the heat shields next to the exhaust manifold/ header pipe connection they are held on with 2 bolts ,
if one comes off then it will flap in the wind

depami

Find anything?

Charley B

About a 1/4 mile back from where you pulled over and looked under the car.

That's where the bag fell off from under the car.

jon928se

Also check the black plastic plate that between the rear edge of the front PU (fender) and the lower edge of the radiator flap framework. Shove your hand in the 3rd slot down in the front - the black plastic link plate should be firmly attached.

yardpro

thanks for the input.

i could not get on the lift today....

Leaving for 7 day cruise tomorrow and found some issues with my die gear yesterday...

Had to deal with that in my spare tie today. Not going to miss diving in cozumel and beliez... and NOT going to trust my life to rental regs....

Looks like baby will have to wait until we get back.