I win! (was: Bad gas?)

R Mangas porter_dog at hotmail.com
Sat Dec 14 08:59:09 EST 2002

   I don't have the part in front of me at the moment, Ben, but where are
the assembly screws located?  From my cursory examination last night I only
saw one, about 8-10mm across, on the mounted side.  I pulled it out and it
was obvious that it _wasn't_ an assembly screw.

  Should brake cleaner shot into one port come out the other?  Mine was
plugged, but I don't know if that's the normal unpowered state or not.


>From: Ben Swann <bswann at worldnet.att.net>
>Reply-To: "bswann at worldnet.att.net" <bswann at worldnet.att.net>
>To: "'porter_dog at hotmail.com'" <porter_dog at hotmail.com>
>CC: "'quattro at audifans.com'" <quattro at audifans.com>
>Subject: I win!  (was: Bad gas?)
>Date: Fri, 13 Dec 2002 21:56:37 -0500
>Great you found it.
>A1. I have had some success going the one step further than I've been
>telling folks, which is to take it apart completely and clean.  I don't
>know how this might improve the resistance value, but there is penty of
>room for varnished gas to gum up.  You need to get those little brass screw
>out with very strong matching screwdriver and a lot of oomph.  There is a
>diaphragm - thin metal which can be cleaned with very fine - say 1000 grit
>paper.  If you can wait and find one, it may not be worth the trouble, but
>I have fixed them when in a pinch.
>A2. I probably have at least one extra used one if you need.  I'll check.
>p.s. its always nice to have one or more of the same cars around to swap
>parts when trying to narrow down a problem.  Parts cars are good if you
>have the room.
>[  recap:  86 4kq, stalls after starting.  Differential pressure regulator
>current good, system pressure and fuel delivery rate good.
>    The next test according to bently was to check the fuel return line
>volume out of the lower chamber of the fuel distributor, and that looked to
>be a reallll hassle- corroded hardline in close quarters, ugh.  So I copped
>out on that and checked the differential pressure regulator resistance
>instead- out of spec at about 28.5 ohms.  Hmmmm...
>    Lifted the hood on my 87 4kq, took the regulator out and swapped them.
>Now the 86 runs perfect, just like it did :)
>    Q1:  Can the bad DPR be 'fixed'?
>    Q2:  Anyone have a 4kq DPR they'd like to sell?  Ideally, I need at
>one mounting screw as well...
>    Two audi's are better than one,

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