We are getting closer. Finger on Injector, feel the pulse (clicking signal?) The injector magnetic end gets energized and pull up allowing fuel to flow. Think of the hose end sprayer type with the finger trigger. Same concept.
The question here are: Is there a injector pulse signal, Did the injector respond electrically, and last did fuel flow?
With real shop level test equipment, all it takes is a exhaust gas meter and a method to "kill" cylinders one at a time for 15 secs at idle, then read the HC increase at the tailpipe (make sure air pump is off). The cyl which has NO changes is the one not getting fuel supply. Then the questions are Valves working? see compression tests and visual inspection of valve train. (No weird ticking or tapping sounds RIGHT?)
Most techs at this point just slap in an injector and see if the problem goes away. AFTER checking the fuel rail. pressure.
https://www.youtube.com/watch?v=FBBJhrJMyYM
https://www.youtube.com/watch?v=axxl98lToN8
Potential failed part: The offending injector (if pulsing) has a clogged inlet screen or blocked pintal. Usually the latter one shows up as a blackened plug and a "hard restart after 15 mins when hot as fuel just drips down on the intake valve.
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2005 X5 4.8IS
The
Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green