[urq] Re: Have you Replaced Injectors - long cranking, hard starting

[Ben Swann]

This should be in the archives - look for long cranking or hard starting.
You need to remove all the injectors and after operating them as in a spray
pattern test, fuel can be seen weeping up the side of one or more.  Common
problem on injectors on 5ktq's with over 100kmi on injectors.  That along
with the o-ring seals that are usually brittle from heat and age you have
air leaks plus a lean condition on startup.

Other things can be culprit too, including the warmup regulator.  If one
were to be methodical, Bentley service manual procedures including fuel
pressure testing would be in order.  I admit, I don't always do things
methodically as experience dictates common problems on these cars, and I'm
not paid to do this the same on my cars as a dealer service pro. mechanic
might be if servicing someone else's car.  A fuel pressure test would
facilitate isolation of exactly where the problem lies.  I have found after
all is said and done, if original or very high miles, the injectors end up
getting replaced with the newer Viton tipped and new O-rings.

Bottom line for the n-teenth time - replace your injectors if history is
unknown or if they are original on CIS equipped engines.  I know some may
disagree, but to me it costs more in time and equipment, especially if this
is your only vehicle and not doing routine service where you are paid by the
hour - than to just cut to the chase and replace them.  Of course if other
problems are evident, eg. pressure accumulator is leaking fuel on the
ground, well then fix the obvious first.

New injectors usually under $250 often result in engine that runs like new
and will rule out this most common aggravation.

Ben
----- Original Message ----- 
From: "Doug Johnson" <ur-quattro at msn.com>
To: "Ben Swann" <benswann at comcast.net>
Sent: Thursday, January 29, 2004 2:28 AM
Subject: RE: Have you Replaced Injectors


> Thanks!  Any way to tell _which_ injector might be the culprit?
> Would I see fuel in the cylinder upon removal of plugs?
>
>  ~ Doug
>
> -----Original Message-----
> From: Ben Swann [mailto:benswann at comcast.net]
> Sent: Wednesday, January 28, 2004 9:25 PM
> To: Doug Johnson
> Cc: quattro at audifans.com
> Subject: Re: Have you Replaced Injectors
>
>
> I think the prolem would be worse in cloder weather, as you need a richer
> mixture for starting.
>
> Ben
> ----- Original Message ----- 
> From: "Doug Johnson" <ur-quattro at msn.com>
> To: "Ben Swann" <benswann at comcast.net>
> Sent: Wednesday, January 28, 2004 11:21 PM
> Subject: RE: Have you Replaced Injectors
>
>
> > Ben,
> >
> > I've got a 'difficult'-start condition that manifests itself only in
cold
> > (+40 deg. F or below) weather.  Could a leaking injector be
> > temperature-related, and not be problematic in warmer weather?
> >
> > Thanks for your thoughts!
> >
> >  ~ Doug
>
>
>