lumpy running

audivw · 14-08-13, 09:56 PM

I have a 90 quattro with a bit of a problem
its as lumpy as hell between 2500 and 3500 rpm
I have changed vac pipes,ht leads,rotor arm spark plugs timed it up new filters oil fuel pump air the lot
its as sweet as a nut on tick over and when you drive like a granddad but when you give it a bit its as if its missing ............. and its p#ssing me off now

any ideas

Subsea7 · 17-09-13, 10:27 PM

Since you tried everything else that I would have tried, what about the fuel pressure? I think ur fuel pump is on its way out. Or the filter is badly choked, but that's less likely on a petrol.

You need to get the fuel pressure checked, and fast before you burn a hole in a piston.

msh · 17-09-13, 11:07 PM

You won't believe, but audi made two generations of A90q and at least dozen of different engines for them!

So what are we talking about?

17-09-13, 10:27 PM	#2
Subsea7 Grown up member Join Date: Sep 2013 Location: Fife Posts: 21	Since you tried everything else that I would have tried, what about the fuel pressure? I think ur fuel pump is on its way out. Or the filter is badly choked, but that's less likely on a petrol. You need to get the fuel pressure checked, and fast before you burn a hole in a piston.

17-09-13, 11:07 PM	#3
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	You won't believe, but audi made two generations of A90q and at least dozen of different engines for them! So what are we talking about?