hey guys great forum. very helpful topics.i too love my 7.3 but shes been down for a couple of weeks. heres the story.iwas heading home after work and pulling my 8x10' work trailer when the whole pitch of the motor changed, lost power and started spewing black sooty smoke. iwas lucky enough to get it to my buddies shop that was nearby.well,he hooked up his snap on computer and found out my pcm went bad. it in turn burned up my idm which also made "5"!!! injectors go out.yeah i know its rare but it happened. well ,replaced the pcm,idm,and all eight injectors being carefulnot to get a lot of oil in the cylinders. everythings buttoned back up,passed the buzz test,got good pressures all the way around.she turns over and sputters with a little shot of starting fluid but wont fire up and run on her own.anyone got any ideas as to whats going on? im desperate. there are no codes popping up either

 

Welcome to FTE first off DO NOT spray starting fluid in it. The experts will be by shortly with help.

 

Keep trying to start it, the high pressure oil rails that drive the injectors have drained out when you changed out the injectors.
It will take a good 60 seconds of cranking to refill the rails.
Allow the starter some time to cool off between cranks.
When I did my injectors I removed the glow plugs and cranked the engine for about 30 seconds.
Then I went away and did other things for ten minutes.
Return and crank some more for 30 seconds.
Re-install the glow plugs, valve covers, etc.
Attempt to start. Still took about 15 seconds of cranking and then it fired.

 

Basically what they said...

Welcome!

Dont spray starter fluid to help it!

Make sure your batteries are well charged and let her crank. The starter gets hot after about 30 seconds of cranking so give her a rest and go back to it.

When she fires she will "romp" like crazy and sound like she hates life. Take her to the freeway and run her through the gears so that you get all the air out of the lines. A good 15 to 20 min. of driving will clear her out good. You dont have to be driving her hard but you need to make her see some rpm.

Good luck and let us know.

 

Good advice!! I agree

 

no luck yet guys gonne get a guy with a bigger oem ford computer to take a look at it see if maybe theres something going on the snap on cant read

 

Ummm Just a shot in the dark...but being it is the infamous 7.3 PSD....How about the CPS? Has that been changed out yet?

 

Make sure that the batteries are fully charged. It takes 10.5 volts minimum for the IDM to fire the injectors. When you first go to start the GP's take a lot of juice and along with repeated starting they will draw down rather quickly.

 

illuminate me, what exactly is the cps?and yes sir the batts have been fully charged last for about ten mins fifteen mins. theyre the right batts for the truck according to advance replaced them about four months ago.im dumbfounded as of right now got good fuel pressure,oil pressure,hpop topped to within an inch,just cant figure it out.thanks for the suggestions .

 

thought bout it for a sec ,my camshaft positioning switch checks out good ill try a new one anyways thirty bucks is well worth the piece of mind

 

I find it doubtful that the list of parts failed in the order and as a consequence as you described, but that's in the past so let's get this thing running again.

First off, what year truck do you have? Next, when you turn the key to the on position (not start) does the wait to start light (WTS) come on for a couple of seconds, then go off like normal? Can you hear the fuel pump humming for 20 seconds then go off if you don't engage the starter? If you turn the key on (not start) and open the fuel drain valve, do you get a really strong stream of fuel squirting out of the tube, or does it look like it's just gravity draining?

Next, is the engine oil full? Oil in the HPOP within 1" of the top? Did you evacuate the oil and fuel from the cylinders before you started cranking it? Does the tach needle bounce while you crank the motor? Does the oil pressure gauge come up after 10 - 15 seconds of cranking? Is there any smoke out the tail pipe while cranking?

A 15 minute charge is probably not enough for this motor. Without sufficient voltage, the IDM will not command the injectors to fire. A long trickle charge is in order, or a boost or jump start is needed while working through this. If possible, monitor voltage, rpm, fuel pulsewidth, & ICP while cranking and share those numbers with us.

And just to be clear. Tell us about the new 8 injectors? Are they new or rebuilt? Where did they come from? I've seen one truck with a set of DIY rebuilt injectors that would not start. We went through everything we could think of with that one and stuck some used injectors in as a last ditch effort and it fired right up. The down side to replacing so many things at once is you don't know which part might be giving you a problem, or if it's something completely different.

 

ok its a 2000 7.3 powerstroke.the fuel pump is pushing the fuel out,not gravity,wts is a go i have trickled charged at 2 amps over night i was just saying the batteries only last 15 20mins before they get weaker.rebuilt injectors from pensacola diesel.umm the oil pressure jumps up after 6 7 secs well over 500 lbs actually if i remember correctly it went up past 1200 on the snap on computer.voltage pulsewidth rpm ill have to get to you tomorrow and whats icp?im not sure on that one.thanks for your time,knowledge

 

Try jumping the batteries from the get go. Even if they are at full charge when you start. I'm wondering if they are draining to quickly for the engine to fire. Every time you turn the key the glow plugs do come on that coupled with the repeated cranks of the starter can run them down quickly even before you start to notice that they are run down.