Re: fuel injectors (-10sp)

[paul.heneghan@bbc.co.uk (Paul Heneghan)]

From: "Mark&Michelle Sousa" <mps@netpci.com>

>I'm going to
>go ahead and replace the cold start valve first and see what happens, I was
>quoted $68 for one. Is it possible that this valve can be stuck open thus
>flooding th engine with more fuel than needed? if the valve is not the
>problem, then I'll go ahead and replace the injectors and seals. I was also
>quoted $57 ea for the injector, $1 ea for seal.

The CSVs have been known to stick open.  Check (with a test lamp) that it is 
only turned on for a few seconds when the engine is cold.  The details are 
in Haynes, Bentley etc.  This is a test of the thermotime switch.

If the electric supply is functioning correctly, take out the CSV, stick it 
in a glass beaker and give it 12V (if you produce any sparks while doing 
this, your insurance company might buy you a new Audi for when you come out 
of hospital!).  It should produce a spray and turn off when the 12V is 
removed.  If the spray is a bit uneven and not very mist like, don't worry. 
 The CSVs never produce as good sprays as the main injectors.

For testing the main injectors, you need to remove them, put them into 
glasses and measure their flow rate.  Check for good misting and no dripping 
when turned off.  You really need to get hold of a manual (Haynes, Bentley 
etc.) if you are going to do this.

One last warning - treat petrol with a lot of respect.  I have done so ever 
since I nearly burned down my parents garage as a teenager.  Even still, 
last month, I opened a petrol can beside a generator which I wanted to fill. 
 Because the can was much warmer than when I filled it, the petrol sprayed 
everywhere, including over the hot exhaust of the generator.  Luckily it 
didn't ignite.

Paul
paul.heneghan@bbc.co.uk
1984 Audi 80 quattro
1989 Audi 100 Avant