CIS Problem?--AGAIN!!!

[Ben Swann]

Yes - watch them weep.  Have a set on hand  - Plan on replacing them when you
do this so as to not have to pull them twice.

The Quantum injectors will not work.

Break down and buy new injectors.  This is a penny-wise pound foolish using
old injectors in these.  I have even seen some relatively new ones be bad.

I said the same thing when I owned my first 5ktq's.  Then I found I was
wasting more time on diagnosing than just to replace them outright.  If you
know they are not nearly new - do it!

Ben

-----Original Message-----
From: L DC [mailto:ldc007usa at yahoo.com] 
Sent: Tuesday, June 27, 2006 5:02 PM
To: Ben Swann; 'Cody Forbes'
Cc: quains at sbcglobal.net; quattro at audifans.com; 'Ben Swann'
Subject: RE: CIS Problem?--AGAIN!!!

Thank You Cody and Ben.

Ben wrote:

>I know in theory - the fuel leaked into your engine,
> but that leaked fuel is now condensed on the 
> manifold, and the line pressure has leaked down.
> Therefore no spray.  It can take 10-15 seconds of
> cranking to get them charged up again.

So, can I test for leaky injectors, by, say, pulling
and placing them in a receptacle to collect any fuel
sprayed while cranking engine and then let them sit
and see if they leak (provided I crank engine long
enough to build pressure if none there) ?

Yes, pulling them can be a PITA, even when using the
appropriate tool and big ass screw drivers, as I found
out when I did that job on the head rebuilt of my VW
QS. The O-rings had "crystallized" and were not
pliable as rubber should.

I have a complete set of used but good injectors from
an '87 VW Quantum Syncro which share the same drive
train as the Audi 4KQ.

I assume they're similar injectors as the ones in the
5KTQ, so I could swap them to see what happens? 

I'm not trying to be cheap or anything, but I don't
want to go and spend more on new injectors unless
certain that's the culprit.

Thank you all again!!

-Louis..in South FL where it's been raining on and off
just about everyday for the past month, preventing him
to open the hood and get to the bottom of it all. 


--- Ben Swann <benswann at comcast.net> wrote:

> Not sure what the specific question is.
> 
> As I mentioned, old leaking injectors can and will
> cause hard starting.  I have had this problem on
> just about every 5kTQ that I have owned or worked on
> and other CIS cars as well.  Usually among the
> contributing reason folks get rid of the cars.  One
> thing leads to another and the leaking injectors 
> causes a domino effect on things - too much draw on
> starter and wiring leading to other failures, etc.
> 
> The fuel pump valve and accumulator will cause a
> loss of system pressure if they are defective, and
> can also result in line leakdown, but usually this
is
> not the problem.  If you replace your injectors and
> that does not fix then look at doing these.  
> 
> Fuel pressure and leakdown tests can tell you
> something, but hard to do and
> difficult to prove a leakdown is not happening with
> the test equipment.
> 
> O-Rings go along with this fix and the combination
> does wonders.  Of course
> getting at all those old vacuum lines may help as
> well.
> 
> Ben


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