I'm currently replacing the injectors on my 1990 7.3 L IDI engine. Had lots of struggle to get the injectors out, but after a few weeks of patience and lots of different techniques tried i finally managed to change 7 if 8 injectors.
The last one is #4, drivers side, second from the front of the car. There is a strange fitting between injection line and injector. I learned from research that this is a pressure sensor, that is not connected but needed for correct timing, because it ensures that the distance between pump an injector is the same on all lines.
What puzzled me is the fact that internet told me this sensor would sit on #1 on truck IDIs, but mine is sitting on #4. I now suspect the previous owner may have switched it to the wrong injector without knowing - causing one slightly longer (#4) and one slightly shorter line (#4).
Would one notice the difference by ear? Would that do any damage to the engine?
Can anyone confirm that it normally sits on#1?
Apart from that the flare nut of this line is seized to the line. Line turns whenever i try too loosen it. I fear breaking the line. Are there any tricks i should know of?
And are there cheaper options for sensor replacement than the more than 200$ parts i found at rockauto, in case i break it? I dont want a sensor, a "dead" piece to lenghten the line in question would suffice... I cant handle paying that much for a simple adapter.
Your collective wisdom is greatly appreciated