[T3] no fuel spray at injectors

[Jim Adney]

On 16 Apr 2013 at 9:32, Ken Main Mail wrote:

> Turn the key ON and go to the engine. Press the throttle down while 
> you listen. You should hear a series of injector clicks as the 
> throttle opens but not as it closes.
> 
>    Yes, series of clicks from injectors hear from right side only.

When you do this, one PAIR of injectors should click, either 1&4 or 
2&3, so you should get clicks from both sides. Which pair clicks 
depends on the position of the distributor. Try FEELING each injector 
while you do this, then turn the dist 180 and repeat. If you have a 
bad connection to one injector, this should show it up.

> Loosen the distributor clamp and pull the distributor up about 1 cm. 
> Remove the dist cap. Disconnect the green wire from the coil. Turn 
> the key ON. As you rotate the dist rotor, round and round CW, you 
> should hear injectors click about every half turn.
>     
>     Yes, heard and felt injectors clicking while cw dist rotor, both sides.

These should be happening pairwise, as above. 

> Note: As I disconnected green wire from coil to dist with key on, slight
> sparking and the fuel pressure regulator was whining that high pitch getting
> higher and higher until it stopped. You could feel the fuel pressure
> regulator vibrating.

The spark occurred because you pulled the green wire with the key ON. 
Hope you didn't get too much of a shock. It can feel significant.

I believe the whine is the caused by bubbles being pushed out thru 
the pressure regulator. It's pretty common and doesn't ever seem to 
be a problem. It's an indicator that fuel is flowing and that the 
pressure regulator is working, although there's no assurance that 
it's working at the right pressure. Pressure regulator failures are 
extremely rare.

Back to your problem, are you SURE the distributor is all the way 
down, fully engaged with the drive gear? It's possible for it to be 
sitting on top of the gear and not rotating in sync, or not even 
rotating at all. To make sure, see if you can twist the rotor CCW. 
There may be some play/backlash, but it should not slip.

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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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