1989 16v kjet job to start..

[richandhazel]

My old Audi coupe GT had worn injectors that resulted in starting problems in the morning after being left overnight. I thought the fuel would evaporate over night, but for some reason it doesn't. A temporary fix that worked really well for that car (so turned in to a permenant fix ) was to disconnect the extra cold start injector in the inlet manifold.

[golfvr6]

Are you sure the cold start valve wasn't the problem to start with?
The fuel will vapourise if left overnight in the cylinder, same as it vapourising when cold starting hence an extra injector is needed.

[richandhazel]

It was a known 'fix' at the time, to unplug the cold start injector. The fuel, and don't ask me why, doesn't seem to vapourize in the cylinder. I used to think it should, however, one morning I removed a spark plug and it absolutely stunk of fuel in there (and that was without cranking the ignition or even switching it on). I guess removing the spark plugs the night before would help to allow it to vapourize.
Just my experience, might not hold true in all cases of injector wear

[golfvr6]

The injectors must have been pissing it out for that to happen.  

[richandhazel]

I think they continually drip over night until the accumulator and system pressure drops, which I imagine could take some time and a fair amount of fuel. Once the fuel starts pooling on the piston crown I think it must take some time to evaporate, hence squirting that extra fuel in with the extra injector causing even more problems.

The Audi used to start first fire when I got it. Over a period of around 4 years it progressively took longer crank times to start and I started to notice the smell of fuel (flooding). I unplugged that extra injector (after reading an article about said problem in VW-Audi magazine) and sure enough it started straight away. I had that car for 11 years and put 120,000 miles on it. I sold it with 220,000 miles on it, the head had never been off and they were still the original injectors so I guess it's quite possible they were in dire need of replacement.

[golfvr6]

How did the car run with the worn injectors?

[richandhazel]

It ran as good as the day I bought it (as far as I could tell), hence I never replaced them. I'm a great believer in not touching anything that isn't broken so I didn't see the point in replacing the injectors, even though 220,000 miles is expecting rather a lot........agreed.

Don't get me wrong though, I (like you I'm sure) am methodical with regular maintenance i.e timing belts and oil changes etc., its just things like injectors I would replace 'on-condition'.

[richandhazel]

Just nipped into 'chat'

[jedi16v]

sorry to be completely stupid could anyone point out where the cold start valve and the warm up regulators are . much app.  :-[