| Author |
Message |
Tazio Nuvolari (Nuvolari)
Junior Member
Username: Nuvolari
Post Number: 215
Registered: 9-2002
| | Posted on Saturday, May 17, 2003 - 7:47 pm: | |
My thanks to everyone who posted. I found the terrible rattle and it was the A/C line rubbing against the intake duct on the bodywork. To fix it, I wrapped the A/C line with foam insulation used for copper plumbing pipes. It is neat, easy and about 35 cents; by far the cheapest repair I think I will ever encounter. |
Bruno (Originalsinner)
Intermediate Member
Username: Originalsinner
Post Number: 1091
Registered: 5-2002
| | Posted on Thursday, May 08, 2003 - 5:52 pm: | |
I had the same thing was the heat shielding on the exhaust against the frame from the rerar bank. Sounds like about same spot where Dave describes. Bent it down with lever and put heat resisten vibration eliminator inbetwen it and frame. Can get from local plumbing,hvac supply stores. they call them vibasorbs.I just wedged it in there. Hasnt fell of yet. |
Verell Boaen (Verell)
Member
Username: Verell
Post Number: 717
Registered: 5-2001
| | Posted on Wednesday, May 07, 2003 - 7:28 pm: | |
FIRE AVOIDANCE PRECAUTION
While you're re-routing the A/C lines, check to make sure that the fuel line that goes over the a/c compresor area isn't touching one of the lines or something on the compressor.
My car had the fuel line braid worn thru by the crimp attaching an A/C line to the fitting for the pump.
There was a recall on this as it was one of the common causes of 3x8 fires! The fuel line would cut thru & gas would drip down onto the very hot exhaust manifold!
However, there still seem to be cars out there w/o the recall! |
axel wulff (Axel)
New member
Username: Axel
Post Number: 1
Registered: 5-2003
| | Posted on Wednesday, May 07, 2003 - 7:16 pm: | |
I spent years tracking this same annoying buzzing/rattle down and found the same as Tom Jones >> the AC lines touching on the body work (side air intake) passenger side that @ 3000 to 3200 rpm rattled. Always though it was a loose rear window. I isolated it by using a rubber malid and with the car jacked up started tapping the frame, exhaust, engine and suspension parts. When a similiar sound started resonating I took the inner fender liner out and found the 2 AC hoses resting on the inside of the air inlet. Placed some foam around it and bingo.. solved the problem. Hope this helps....
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JRV (Jrvall)
Intermediate Member
Username: Jrvall
Post Number: 1412
Registered: 11-2002
| | Posted on Tuesday, May 06, 2003 - 2:09 pm: | |
>>It always comes from just behind the passenger seat at 3000 rpm. The road speed does not matter; <<
Follow Tom Jones's advice..dollars to donuts the passenger side/3000 rpm rattle is the AC lines touching on the body work around/behind the gas tank.
*several things typically rattle:
1- Loose Exhaust Coverings (usually at idle)
2- AC lines (2500-3500 steady state rpms)
3- Air Pumps
4- coolant lines improperly touching gas tank or body work
5- air cleaners/snorkles rubbibg on hood/boddy work or coolant hose
* this assumes motor mounts and reaction rod are in good condition.
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david handa (Davehanda)
Member
Username: Davehanda
Post Number: 697
Registered: 5-2001
| | Posted on Monday, May 05, 2003 - 9:31 pm: | |
I had something very similar sounding. It turned out to be the rear bank exhaust shield touching the frame rail on the passenger side of the car, very near the right driveline. I used a prybar to gently pry/bend the heat shield so it would no longer touch the frame rail. It actually, was a couple millimeters away, but under acceleration, would touch. |
Tom Jones (Ferrarioldman)
Junior Member
Username: Ferrarioldman
Post Number: 114
Registered: 6-2002
| | Posted on Monday, May 05, 2003 - 8:31 pm: | |
I have also seen A/C lines that are touching the body do this. This is why they are secured with clamps in later 308 and 328's. But you hoses are routed a little differently. I usually try to insulate them from the body with a foam covering. |
Doug meredith (Dougm)
Member
Username: Dougm
Post Number: 295
Registered: 2-2001
| | Posted on Monday, May 05, 2003 - 8:24 pm: | |
Years ago when I had a 308, it was the duct from the side air vents rattling on the inside rear 1/4 panel if I remember correctly. Not easy to reach, but attainable after removing the fender well and wedging a piece of foam between the duct and body. |
John_Miles (John_miles)
Junior Member
Username: John_miles
Post Number: 57
Registered: 7-2001
| | Posted on Monday, May 05, 2003 - 7:59 pm: | |
Assuming you've ruled out the obvious (belts and tensioners), make sure the metal fittings in the fuel lines are nowhere near the firewall. In a 308, the slightest metallic tap against the firewall will be magnified into an insanity-inducing rattle in the cockpit!
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"The Don" (Mlemus)
Advanced Member
Username: Mlemus
Post Number: 4411
Registered: 8-2002
| | Posted on Monday, May 05, 2003 - 2:55 pm: | |
I had the same problem.
It was actually the door vibrating. I replaced the door pins and glued the doorsill trim door to keep them from rubbing
Matt |
Tazio Nuvolari (Nuvolari)
Junior Member
Username: Nuvolari
Post Number: 197
Registered: 9-2002
| | Posted on Monday, May 05, 2003 - 2:51 pm: | |
My 77 308 GTB has a rattle that comes from the engine bay. It always comes from just behind the passenger seat at 3000 rpm. The road speed does not matter; only the engine speed. I remember seeing something here many months back but of course I cannot find it now. Any leads to curing this problem would go greatly appreciated. |