88 90q hesitates on accel

[Perry, Christoper (EDS)]

Hey Tom, I had a similar issue on my 86 4000 soon after I acquired it.  The
bolt that goes through the banjo fitting on the fuel feed line to the fuel
distributor has a little filter installed in it at the factory.  This was to
catch any contaminates form the assembly process and was to be removed at
one of the initial service intervals.  On both my 86 4000 and my 89 90q
these filters were still in place at 100K miles.  On my 4000 it was so badly
clogged that it was starving the car for fuel causing the bucking you
describe.  At the time, I thought it needed to be there so I cleaned it up
and re-installed, problem went away.  Later I found out that it was supposed
to be removed and so I got rid of it.

I talked to an independent shop owner and it is one of the first things he
checks.  He says probably 30% of the cars he sees still have the filter.
You may want to check.

Other places to look (assuming spark and air are OK)would be the fuel pump
and/or filters or for any sediment in the tank.

HTH,
Chris Perry
89 90q

-----Original Message-----
From: Tom Nas [mailto:tnas at euronet.nl]
Sent: Monday, July 29, 2002 2:35 PM
To: quattro at audifans.com
Subject: 88 90q hesitates on accel


Hi all,

My 88 90q, NG engine w/213k km, has developed a nasty stumble on
acceleration. You press the accelerator, it feels like usual until you get
a violent hesitation. After that it's back to normal again. This mostly
happens at <3k RPM.

Plugs, wires, distributor etc have been verified to be in fine shape. WOT
switch and idle switch have been respectively fixed and verified OK. Does
my car have a throttle position sensor which could be FUBAR?

TIA for your suggestions!

Tom