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1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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post #1 of 57 (permalink) Old 10-07-2018, 08:46 PM Thread Starter
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Won't start

2003 7.3 CCSB 4x4. Recently I was maneuvering in my driveway and it died. When I went to restart, it turned slowly and didn't start. So I put my charger on it. Didn't help. Checked batteries, one was at 500cca so I replaced it with a new 850 cca. Still slow turning. Checked starter, dying so I replaced it. Now I can turn it quickly but no joy. Tank down to just above empty so I added 5 gallons plus diesel cleaner. Nothing. Drained bowel, diesel came out. So now I've used the starter enough that it won't turn fast enough so I'm charging my jump box and then I'll see. FWIW, it was running just fine before all this happened. I've done a lot to it lately. The other battery in her is only a few months old. No codes coming up and no check engine lights. Any ideas and/or questions?? Please help!!!!!
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post #2 of 57 (permalink) Old 10-07-2018, 10:18 PM
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Is it registering on the tachometer while cranking?
Hear the fuel pump running?

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post #3 of 57 (permalink) Old 10-08-2018, 12:53 PM Thread Starter
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As it's an 03, the tach check doesn't work. It isn't producing smoke. The fuel pump is working. It is cranking over unevenly.
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post #4 of 57 (permalink) Old 10-08-2018, 02:47 PM Thread Starter
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What does the lack of smoke mean? Anything??
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post #5 of 57 (permalink) Old 10-08-2018, 03:11 PM
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Lack of smoke means no fuel, or it's not firing the injectors.
I would look into the cps. May even try unplugging the icp sensor.

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1994 F350 7.3 PSD 4X4 ZF5 DUALLY
PHP HYDRA, 6637, 3-4 DP TO STRAIGHT 4 BEHIND THE TIRE, 1.0 EXHAUST HOUSING, DIY D66 TURBO, FUGA E-FUEL, EBPV DELETE. Cooper discoverer AT/3'S.

2010 VW JETTA TDI DSG Kerma tune. Hankook ventus v2 concept 2.


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post #6 of 57 (permalink) Old 10-08-2018, 03:33 PM Thread Starter
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OK. Can't remember when I last replaced the cps. So I'll stop by ford for one.

How does unplugging the icp help??
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post #7 of 57 (permalink) Old 10-08-2018, 04:26 PM
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Unplugging the ICP sensor forces the PCM to use a default value. If the ICP sensor is reporting false data, the PCM would be setting the IPR valve in a position that could cause a no start or poor running condition. While you are up there unplugging the ICP sensor, make sure the IPR solenoid is in place and the tin nut hasn't backed off.

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I wonder if clouds ever look down on us and say, "Hey, look - that one is shaped like an idiot!"
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post #8 of 57 (permalink) Old 10-08-2018, 07:20 PM Thread Starter
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Changed CPS. Now I have smoke but still no fire.
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post #9 of 57 (permalink) Old 10-08-2018, 07:53 PM Thread Starter
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Unplugged ICP. No change
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post #10 of 57 (permalink) Old 10-09-2018, 09:33 AM
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If you have smoke, but no fire, you aren't generating enough heat to ignite the fuel. Slow cranking RPM, low compression, bad glow plugs, etc. Try plugging in the block heater for about 4 hours while running a battery charger to get the batteries topped off.

2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM

I wonder if clouds ever look down on us and say, "Hey, look - that one is shaped like an idiot!"
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post #11 of 57 (permalink) Old 10-09-2018, 11:51 AM
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If you have smoke, but no fire, you aren't generating enough heat to ignite the fuel. Slow cranking RPM, low compression, bad glow plugs, etc. Try plugging in the block heater for about 4 hours while running a battery charger to get the batteries topped off.

You should have someone with the scan tool run a pressure test on those injectors, don't want to go to all that work taking everything apart to put glow plugs in and then repeat it over again putting injectors in.
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post #12 of 57 (permalink) Old 10-09-2018, 12:01 PM
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OK - I'll bite. How do you do a pressure test on injectors using a scan tool?

2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM

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post #13 of 57 (permalink) Old 10-09-2018, 03:02 PM
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OK - I'll bite. How do you do a pressure test on injectors using a scan tool?
Auto Enginuity or Snap On scan tool performs a "buzz test" while displaying the pressure output of each injector. I had four dead injectors on one bank and it was firing like a V-4. I'm just saying you don't want to go through all that work replacing the glow plugs and put it all back together and it turns out to be the injectors. On mine before replacing the injectors, the ICP was good, glow plug relay replaced with the IPR also. Switched out the IDM to test and it ended up being the injectors, replaced with new Swamps 175cc street mild tow injectors with a tune.
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post #14 of 57 (permalink) Old 10-09-2018, 03:09 PM
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I've done a few hundred buzz tests with AE and never saw a pressure readout. What exactly do you imagine is recording the pressure? AE can only look at data that is sent to the PCM. Are you thinking fuel pressure, cylinder pressure, or what?

2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM

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post #15 of 57 (permalink) Old 10-09-2018, 03:21 PM
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I've done a few hundred buzz tests with AE and never saw a pressure readout. What exactly do you imagine is recording the pressure? AE can only look at data that is sent to the PCM. Are you thinking fuel pressure, cylinder pressure, or what?
Sorry I am a bit vague, the one that ran the injector test was using a snap on scan tool, he showed me the readings of the pressure output for each injector and basically the problem was the injectors weren't building enough pressure for the engine to start. I don't know anymore details, but I was impressed.
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