You will find a fuse for injectors, replace with a wire loop and use an amplified current probe to view the current ramp up of each injector on a digital oscilloscope.When the pintle lifts open you will see a ~ in the current graph [/] and can compare the real open time in milliseconds with the ecu commanded time.
See this graph:
http://www.picotech.com/auto/a...s.jpg
http://www.picotech.com/auto/a....html
Note that during the first 0.8>1.0 milliseconds of on time zero fuel flows until pintle opens.
At idle the open pulse is 1.2ms yet fuel flows only 0.4 at max yet at WOT high rpm 10ms less 0.8 is 9.2 ms of fuel...............23x difference [9.2/0.4]
The point is view all injector current ramps simultaneously and look for any unusal shapes.
http://www.t3auto.com/
