snapons measurement of the pulse widths said that if the pulse widths get over 1.7 it will cause premature pmd failure all electronic fuel injection wether its in the pump or unit injectors pulse width is measured as part of the diagnois

 

The fuel solenoid pulse width is a commanded duration from the ECM,having a longer duration than expected is out of the control of the item being powered.

Unless the diagnostic troubleshooting is a GM diagnostic spec,it is nearly worthless.
The aftermarket has little understanding of the operation of these engines,nor do very many technicians nation wide.

A very good no start diagnostic is however available here:
www.AccurateDiesel.com - PMD Installation Instructions - Accurate Technical Services, LLC

 

thank you a very good site.it helped me alot. my pmd failed the last test.

 

Glad you were able to get a result from the procedure.

Post back when you get a NEW PMD and have it relocated behind/under the frt bumper or behind the grill on a rad support with a resistor installed and an extension harness(homemade/buy).

Getting the PMD away from underhood heat after shutdown/heatsoak is the best thing you can do to lengthen it's life-they do not tolerate sudden temp swings in any direction.

Also it's good to know the problem is solved.

 

tell me what you know about the resister as to what size and where thanks

 

The resistor is in the PMD harness cavity,a little smaller than the plug otherwise it wouldn't fit.
Sizes come most often from #1 to #9 with 9 allowing the most fuel correction.

They are used to calibrate the IP's for equal fuel output in a given range-emission wise.

A small pair of snap ring pliers is good for removing them from old PMD's,the 2 holes below the pin holes are where to grasp with the pliers.