CIS Problem?--AGAIN!!!

[L DC]

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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