Quote:
Originally Posted by 745 TurboGreasel
The only reason I can imagine MPG going down with new injectors is if they forgot the heat shield washers?
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Sometimes if somebody times the IP the hard way (moving the pump rather than the cam gear), and the pump ends up rotated too far in the "advanced" direction, the aneroid on the top gets in the way and the #5 and #6 injectors cannot be removed until the pump's turned back out of the way again. If that was the case, then it's a possibility that the shop that worked on it had to reposition the IP in order to replace the injectors, and might not have gotten it back in the right spot. That's one possibility for mileage change... also actual ignition timing changes if injector opening pressures are altered, so if your old set was severely worn, this might account for some of it. Overall, though, it sounds like either by mistake, ignorance, necessity, or some combination of these, whoever worked on it when the injectors got put in may have changed some other factors about the motor. Seems like that's the only way to explain the difference in the way it starts and runs. Incorrect timing seems like a big suspect. If the diesel shop disconnected the CS device, that might be further indication that they had to change the timing and were attempting to get it right again.
What was the original reason why you had the injectors changed?