I think Barry. Mismost and ConnClark are onto the solution here. Anyone who's seen the DVD "Supersize Me" got to see the McDonalds french fries that just would not spoil, even after months. So there you have it.. a soure of non-spoiling potatos and glue product to mount them to theinterior firewall with :D

Probably just end up being yet another thing for the mice to snack on though.

Use Diesel Kleen in your tank
 

I used Diesel Kleen, an additive that gives "up to" 5% increased mpg, because it helps the fuel explode a fraction of a second sooner. If you use it for a few tanks, it will clean your injectors out and make your car quieter. You only have to use something like 3 ounces per tankful, not the whole bottle. For the first run, you might want to put in 5 ounces or something. Thereafter, you can still pour a little in each tankful. Really works.

Make sure your hood mat is in good shape. Many of them are old and disintegrating. That will reduce noise just a bit, but not much.

Jeff 1991 300d

Yes, I added peel-n-seal after I first sprayed some rubberized coating on. It was quiet to start, now its really quiet... :sleeping:

Before adding extra insulation I would check to be sure there are no holes in the firewall. A small hole will allow a huge amount of noise. Also the padded panels under the dash muffle a huge amount of noise too.

Tom W

Dynamat is one that I always hear good stuff about.

it is a science to fix this noise. the amount of area that transmits noise is astounding. the exterior door panels, the firewall, the wheelwells, the floors, the roof of the car, etc. it turns out that just covering up the panels is not enough, the deadner has to actually bond to the surface that is passing the sound. a vibration in the floor can resonate and cause the roof to produce the sound. bonding the dynamat or whatever butyl or mecadum material you choose, causes the metal not to vibrate in the first place... LOTS of work here.

Just turn up the radio.....:D

Skid pan if available....
 

Under the engine with added sound deadner (peal and seal) helped the later models with sound deadner solutions. You might want to try that method of sound protection also.

Peace

Run-em