I work for a company who has a fleet of E350 vans with the v10s in them.. They are geting near 100k so we started replacing the spark plugs in them. A guy i work with just finished installing all the plugs and now it cranks but wont start. We have the ford IDS system at the shop so i tried a few fuel system checks.. i did the fuel leak down check and it said everything is good and has good fuel pressure. then i did a injector test and it said the injectors are not functioning. i went to the data logger and looked at all 10 cylinders for injector fault and it shows a falt on all cylinders..I was looking through our books to see if there was a trouble tree to follow for this problem but i didnt have much luck.. we checked all of the connections and everything looks good.. I am not geting any DTCs with the problem.. Any one have any ideas?? thanks

 

It is hard to beleive that all 10 spark plug gaps are out of spec or somehow all wiring harnesses are unseated . Well, may be the PCM is not getting "READY" signal to activate ignition . I am just guessing to give you some ideas .
There is something called " Camshaft Position Sensor " that sends ready signal to PCM , you may want to check that . Here is some info from my Haynes , perhaps it might help you ;
CAMSHAFT POSITION SENSOR
The camshaft sensor signals the PCM to begin sequential pulsation of the fuel injectors . The camshaft sensor on 6.8 L engine is a variable reluctance device which is triggered by the high point mark on the camshaft . The sensor is mounted on the front of the cyclinder head near the camshaft sprocket .
TESTING : 1- Check for battery voltage to the camshaft position sensor with the ignition key ON (engine not running ). 2- Remove the camshaft sensor from the engine and place it on a clean workbench. Check the AC voltage output . Connect the probes of a voltmeter set on the AC scale onto the camshaft sensor and observe that it produces a voltage pulse as a metal object is passed over the tip of the sensor . If no pulsing voltage signal is produced (if the camshaft sensor does not exhibit any reaction as the magnatic field is broken ) , then replace the camshaft sensor .

Good luck,

 

There is one fuse that controls power to all the injectors. Check that.

While you're at it, check for voltage between the RED wire on any injector connector, and ground, with the key on.

 

Well we figured out today that fuse 26 in the power distubuition is causing the problem. When the fuse is replaced it blows right away so we have a shot somewheres. The only problems is the books that we have show that fuse being for the trailer plug. We pulled that fuse on another van and it wont run so we know that's the problem.

 

The tech shorted the red wire in the injector harness to ground. I bet you'll find that somewhere there is a pinched wire.

 

yes thats exactly what we found today. When he put the coil pack back in and tighened the hold down bolt he pinched an injector wire and shorted it to ground.. It was on the right side of the engine so it was under the transmission dip stick tube and all the aux heater hoses which made it hard to spot.

 

[QUOTE=kink2227;10093027]I work for a company who has a fleet of E350 vans with the v10s in them.. They are geting near 100k so we started replacing the spark plugs in them. A guy i work with just finished installing all the plugs and now it cranks but wont start. We have the ford IDS system at the shop so i tried a few fuel system checks.. i did the fuel leak down check and it said everything is good and has good fuel pressure. then i did a injector test and it said the injectors are not functioning. i went to the data logger and looked at all 10 cylinders for injector fault and it shows a falt on all cylinders..I was looking through our books to see if there was a trouble tree to follow for this problem but i didnt have much luck.. we checked all of the connections and everything looks good.. I am not geting any DTCs with the problem.. Any one have any ideas?? thanks[/QUOTE


Did you ever find the problem? I have a 05 expedition 5.4 triton that is doin the same thing!