While working on my Ranger with fuel pressure problem, I got a tip for checking for leaking injectors.
Turn on the key, mash the gas pedal to wide open throttle and crank normally.
This is called Flood Mode and shuts off the injectors. You still have spark so any leakage will cause popping.
Gave me the direction without removing my injectors!
Not sure what other vehicles this works on so do your homework.
Bruce
