rcrone928

I've been trying to track down a loud wind noise for several weeks off and on. I've taped off every seem around the doors, windows,sunroof you name it. I pulled out the heater box to reseal it and also repair leaking vac pod. No matter what I do still getting the wind noise. I was wondering if the air leak may be coming through the fire wall perhaps where the wire loom comes through. The noise seems to be under the dash somewhere. I may pull glove box and use a stethoscope while someone else drives the car. It's an 83 by the way.

Kalspeed

May be worth a try...while you are driving on a lonely road...call someone on an cell and position the phone in various locations...as you safely maneuver..they may be able to "hear" the change..silly yes but a thought

Alan

Its wind for sure ? (speed related) and not vacuum leak noise...?

it would be most unlikely that you'd have air through the grommet (unless its not installed right).

Recirculation/fresh air return box seal could be bad(above CE panel)

Your windshield (sides) or side roof drain rails could be an issue. Could be door seals giving up the ghost (lost "springyness") - my car was a lot quieter with new seals...

Alan

rcrone928

Thanks Alan. I resealed airbox and I put tape on the outside of the car all around the doors and windows also along also along the drip rails and sun roof and every other gap I could think of Still sounds like it's coming from the base of the passenger windshield almost like it's under the dash. May pull everything out from that area but I hate doing that.

jpitman2

Get some 1" wide strips of paper, or start with a sheet of newspaper, lay over, say the top and front edge of an open door, shut the door. Now see if you can easily pull any part past the seal. Narrow strips will help to localize the gap better. go right around the doors, then do the hatch. the front edge of the doors may have to be done from inside, due to the hinges etc.
I have to do this myself, but never seem to get a round tuit.
jp 83 Euro S AT 55k

rcrone928

God idea jpitman2. I'll try that and let you know what I find. I did put tape all around the door jamb on the outside to seal the gap to no avail.

MainePorsche

Curious, has the windshield ever been changed ?

FredR

Is this something that has just appeared or always been there? Appreciate you have been trying to track it down for several weeks -presumably by implication you have been doing so since it started.

Presumably you are not hearing the wind as it hits the square shaped mirror stock mirror housing? Porsche went to the aero design for a reason. Trouble with these sort of noises is that they are often masked by the perceived direction they are coming from which quite often is anywhere but from they actually emanate from- maybe I have been unlucky in that regard!

Good luck tracking the problem down. Don't suppose your Hi-Fi system packed up by any chance?

Regards

Fred

Jerry Feather

I think Alan may have the best idea about what it is.

Last summer when I was stimulated to develop the Windshield Trim Gap Filler Strips my motivation was purely from a cosmetic standpoint. However, when I had an opportunity to install several sets at OCIC I discovered on many of the cars that there was a short piece of weather stripping stuffed into the upper corners of the windshield under the trim and not visible.

What I have concluded is that the gaps along each side of the windshield are actually part of the rain gutter system put into the original design of the car. You should notice that in the upper corners of the wihshield under the trim there is an opening where the water off the windshield can flow up the gap and through the opening and into the somewhat hidden rain gutter under the aluminum trim that passes to the rear just above the doors.

I think what happend is that with the first cars there was found to be a significant amount of wind noise generaqted by these little openings. The result was, I think, that the Factory started closing the openings at the top of the gaps with the little pieces of weather stripping; and I would not be surprised to learn that there was some kind of service bulletin published for this to be done by dealers in the field. There may even have been a kit of sorts provided to do it with because the little pieces of weather stripping that I have pulled out of many 928 are almost exactly the same.

Then in 91, I think, when the Factory started showing more concern with noise control they came out with the rubber gap fillers that were installed in all the 928s after then through the GTSs. Those gap fillers have a tiny extension of rubber that in fact is pulled through the openings at the top.

I suggest that you look to see if your car has anything closing these little openings and if not put something in there to see if that will solve the problem. Then if it does and you are concerned about the gaps, let me know and I can provide you with my product.

Mrmerlin

plug the vacuum line to your hvac system then go for a drive you want to isolate the black line at the 4w ay splitter at the brake booster

rcrone928

thanx everyone for your input to my wind noise. I posted that I completely sealed ALL the window and door gaps ,window, sun roof and rear hatch from the outside with wide plastic tape. also the drip rails and the trim gap along the sides of the windshield. I put the tape completely around the windshield that covered both sides of upper windshield to body trim. As far as a new windshield I cant tell if ever replaced. The noise has been there since I bought the car but, has been getting louder in the last month or so. I'll check out the other suggestions you guys have given. the vacuum system is very airtight and functioning well.

Mrmerlin

this is only a test ,
just unplug the line from the 4 way and plug the 4 way

rcrone928

Thanks Mrmerlin, I will try that.

Brad Hoyt

I have the same thing. Passenger side starts at about 40 mph and gets much ;louder with speed. Sounds like rattling, crackling or like a blown speaker (radio not on). This is my 13th 928 and I have never had this issue. Pristine 30k mile 1988. I have ordered a door seal as a first step. Wondering if you ever resolved your issue?

dr bob

Get someone to drive for you while you sit in the passenger seat and listen. A bit of vinyl tubing in your ear lets you zero in on a wind noise pretty closely.



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