Dif type noise

Crossle · 13-09-16, 07:34 AM

Got a dif type noise comes and goes. Comes in sometimes as I accelerate through mid range revs and then phases back out. Dont hear it on initial acceleration from stand still or when holding a constant speed. Its a bit of a rumble type of noise. I'm thinking maybe CV's?

Its certainly not an engine type of noise.

mikes2 · 13-09-16, 12:19 PM

cv joints make more of a clackety clack noise when turning corners

Crossle · 13-09-16, 02:22 PM

Hmm, no not that then. Very hard noise to describe, I would liken it mostly to if you have a metal heat shield on a car thats vibrating through the whole sheet of metal.

Roger Galvin · 13-09-16, 02:32 PM

Perhaps the O/S engine mount has collapsed such that the engine is sitting on the sub-frame?

maxustaxus · 13-09-16, 06:18 PM

In addition to the suggestions above, do consider front wheel bearings. You can often rule this in or out because the drone will change subtley with cornering, which can sometimes be confounded with vehicle speed (as you might accelerate and deccelerate in and out of corners).

13-09-16, 12:19 PM	#2
mikes2 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Polmont Posts: 2,617	cv joints make more of a clackety clack noise when turning corners __________________ 1991 90 quattro 20v sport 1991 90 quattro

13-09-16, 02:32 PM	#4
Roger Galvin Grown up member Classic Audi Club Member Join Date: Feb 2011 Posts: 239	Perhaps the O/S engine mount has collapsed such that the engine is sitting on the sub-frame? __________________ Roger Galvin Chairman & Technical Secretary, qOC quattro Workshop

13-09-16, 02:22 PM	#3
Crossle Grown up member Classic Audi Club Member Join Date: Jul 2015 Location: northampton Posts: 266	Hmm, no not that then. Very hard noise to describe, I would liken it mostly to if you have a metal heat shield on a car thats vibrating through the whole sheet of metal.

13-09-16, 06:18 PM	#5
maxustaxus Grown up member Join Date: Mar 2010 Posts: 198	In addition to the suggestions above, do consider front wheel bearings. You can often rule this in or out because the drone will change subtley with cornering, which can sometimes be confounded with vehicle speed (as you might accelerate and deccelerate in and out of corners).