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Testing fuel injected quantity > < Test spray pattern, leak tightness and injected quantity

Fabia Mk1

Testing jet formation and tightness
Testing jet formation and tightness
   
–  Unplug the 2-pin plug for the coolant temperature sensor -G62--arrow-.
  S24-0349
–  Connect up digital potentiometer V.A.G -1630- to contacts 1 + 2 of the plug connection and set the connected side to 15 kΩ.
  S24-0342
–  Hold measuring vessel under the injection valve to be tested and disconnect the plug on the other injection valves.
–  Have a 2nd mechanic actuate the starter. The injection valve must emit a pulsed jet of fuel.
–  Repeat test at the other injectors. Make sure that only the valve to be tested is connected.
The jet must be the same for all valves.
–  Then check the injection valve for leaks. No more than 2 drops/min may trickle out.
If the fuel loss is greater than this:
–  Switch off ignition.
–  Replace the faulty injector → Chapter.
  S24-0340

Testing fuel injected quantity > < Test spray pattern, leak tightness and injected quantity