7.3 hardstart / no start - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 10-23-2012, 09:23 AM Thread Starter
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7.3 hardstart / no start

on thursday im going to help troubleshoot a 2000 F550 rollback thats having hardstart / no start issues and a random misfire.

heres the email i got from the owner, what do you guys think?

"I purchased the truck 3-4 months ago, had been unused for quite a while. Have to plug it in to get it to start if it sets for more than 2 days or the temp is below 50. Has 378000 miles. injectors have been changed over the past couple of years over time, oil change is not due for another 2k miles.
I have been running it only for about 2 tanks of fuel. Using it off and on.


I brought it down to have the bed welded, and left it for a week, the shop could not get it to start. I went down and pluged it in and charged it up, after 3 hours of playing with it, it finally started but ran poorly. It did not smoke like it normanlly does when you try to start it when it is cold. So i assumed it had a fuel issue so I installed a new fuel filter and pump. seemed a bit better. once warmed up ran great. Also found battery terminals and one of the relays on the top of the motor was very hot, so i changed relay, and put on new battery terminals.


Drove it home and it ran great.


Still needs to be pluged in to preheat starts for ****, runs for **** when you first start it, clears up after 5 min to 1/2 hour.
Let it run for 2 hours running great then all the sudden, it starting running for **** again.


I did run a can of anti slim thru it to see if that would help, and change the fuel filter again.


I am not a diesel mechanic so I am lost, dont have the right test equipment to pull the codes. I assume you do?
"
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post #2 of 10 Old 10-23-2012, 10:35 AM
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i can think of a few things, that shouldn't be overlooked. make sure the HPOP is 1/2in-3/4in from the top..(allen plug on resivoir).

Next, i'd ohm out the glowplugs.

Then, i'd drop the tank, and do the hutch mod.

While at it, remove the EBP sensor and inspect the tube ,it attaches to...

Welcome to guzzle's In-tank Hutch Mod Web Page

Welcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page

The 9-pin plug is wired as follows:

G G I I C I I G G

G=Glow Plug +
I = Injector +
C= Injector Common

The injectors fire with a 115VDC signal from the IDM. Do Not pierce the wires to test.

Test between "I" and "C" to test the injectors, should be less than 5.0 Ohms.

To check glow plugs Test between "G" and battery ground. Should be between 0.6 and 2.0 Ohms
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99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #3 of 10 Old 10-23-2012, 11:24 AM Thread Starter
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wheres the location of the 9 pin?

Jamie's Garage med/heavy truck service, morrisville VT
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post #4 of 10 Old 10-23-2012, 06:57 PM
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passenger and driver sie valve cover gaskets. Look at pic, and in between the 2-middle injectors ,you'll see the black housing.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #5 of 10 Old 10-26-2012, 04:11 AM Thread Starter
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i went to look at it last night. everything was covered in oil and nasty.
it started but cranked forever then died
checked oil, barely on dipstick. filled oil, checked hpop res. check fuel filter and flow tested in to bowl. found old oring in bottom.
started again, stayed running now but really rough, definite miss
hooked up my laptop and couldnt get any communication, tried 2 other scanners, stil no comm.
ohmed the 9 pin on both banks (injector side)and everything was good.
restarted, running the same, i realized i left the rt bank 9 pin disconnected, reconnected and no change, pulled it back off and no change. only running on left bank.
i ohmed the harness to ground per ford manual and it was open, unhooked at idm and got a complete circuit when testing end to end.

my diagnosis is the IDM is bad and only firing the injectors on the left bank. do you guys agree?
and why is there no obd2 comm, i checked all the fuses?

Jamie's Garage med/heavy truck service, morrisville VT
08 Nissan Titan
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post #6 of 10 Old 10-29-2012, 11:04 AM Thread Starter
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the owner tried another IDM and ECM, no difference.
i didnt think i was getting any power from the IDM but maybe i didnt have good contact on the pins in the harness. is it possible for the IDM to only fire one bank if its good?
maybe i ohmed the head side of the connector wrong.
i think im leaning towards the UVCH now. the glowplugs did ohm correctly, that i m positive of.

Jamie's Garage med/heavy truck service, morrisville VT
08 Nissan Titan
91 F250 460ci
79 Camaro Z28
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post #7 of 10 Old 10-29-2012, 12:38 PM Thread Starter
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just got a call from the owner.
with the new idm and pcm he has no power at the harness to the right bank.

Jamie's Garage med/heavy truck service, morrisville VT
08 Nissan Titan
91 F250 460ci
79 Camaro Z28
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post #8 of 10 Old 10-30-2012, 07:19 AM Thread Starter
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anything guys?? im lost on this one.
why am i only firing on one bank with 2 different idms and pcms?

Jamie's Garage med/heavy truck service, morrisville VT
08 Nissan Titan
91 F250 460ci
79 Camaro Z28
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post #9 of 10 Old 10-30-2012, 07:30 AM
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Been having similar issues with my 350. From lots of research I've seen is that a bad injector solenoid can cause the idm to shut down the entire bank of injectors. With that, the first place to check would be where the large 42 pin connector on driver side of the engine crosses the valve cover. Apparently ford decided it was a good idea to have the injector power wires along the bottom of that connector and they can chaffe and short out. If nothing there, I've heard of people unplugging individual injectors on the side that is dead until the other 3 start firing.

Sorry for the book. But hope it helps out1

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post #10 of 10 Old 10-30-2012, 02:46 PM Thread Starter
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we got it.
it was the UVCH on the right bank.
i dont know why we were getting all these wrong readings but its running like a champ.

Jamie's Garage med/heavy truck service, morrisville VT
08 Nissan Titan
91 F250 460ci
79 Camaro Z28
68 Jeep M715
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