7.3 Slow to Start - Ford Powerstroke Diesel Forum

 
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post #1 of 10 Old 04-09-2010, 07:18 PM Thread Starter
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7.3 Slow to Start

It seems like I have to spin my motor longer before if fires than most others. Any ideas what may cause this??

99 1/2 CC 4x4 dually Lariat A/T 4.10s w/63k miles
Mods-Tymar intake, DP-Tuner , Autometer gauges, zoodad and 4" Bully Dog Exhaust.

Other toys- 88 Suzuki Samurai 4x4 lifted 6"
Polaris 500 HO RSE 4x4 and Yellow 700 4x4
05 Jeep Liberty Limited CRD 4x4

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post #2 of 10 Old 04-11-2010, 02:25 PM
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Low cranking speed, low high pressure oil rail pressure (from leaking injector o-rings), ICP getting weak, IPR getting weak and/or leaking, low fuel pressure - any of these could cause your problem.

Gig'em back at ya - Class of '87
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post #3 of 10 Old 04-14-2010, 06:47 PM Thread Starter
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Thanks Dray!

How many of these potential culprits could be detected by a diagnostics test??

99 1/2 CC 4x4 dually Lariat A/T 4.10s w/63k miles
Mods-Tymar intake, DP-Tuner , Autometer gauges, zoodad and 4" Bully Dog Exhaust.

Other toys- 88 Suzuki Samurai 4x4 lifted 6"
Polaris 500 HO RSE 4x4 and Yellow 700 4x4
05 Jeep Liberty Limited CRD 4x4

Gig'em! '86 Texas Aggie
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post #4 of 10 Old 04-14-2010, 06:58 PM
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If you have access to a good scanner, like AutoEnginuity, you can record all of the parameters except fuel pressure (its not monitored)

Otherwise, try to eliminate them one by one. Jump the vehicle from another strong batteried vehicle to test cranking speed. Then, unplug your ICP and try again - the PCM will use a default value.

Run through and check your glow plug system using this technique:

Hard/No Start? Check here first. - Diesel Forum - TheDieselStop.com
Make sure your HPOP reservoir isn't leaking down - check it in the morning before your first start attempt to make sure it still has oil - if its leaking down, the injector o-rings might be bad. Any smoke? Is it using oil?

If none of these work, you might need to rent a fuel pressure gauge - you tap into the fuel filter assembly using one of the two plugs on the back.
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post #5 of 10 Old 04-15-2010, 12:54 AM
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probably something simple. battery battey cABLE OR STARTER oops caps

2001 F350 CC SB XLT - 6637 w/ Petes filter cover, 08 white tailgate mod, 08 windshield, Gentex Temp/Compass Mirror, 03 Heated Signal Mirrors, Tail light guards, BFG A/Ts
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post #6 of 10 Old 04-23-2010, 05:44 AM
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Mine is doing the same thing.
I have auto ingenuity but need to get it loaded on my new laptop as the old one quit me.
Can you tell me what parameters I need to put in to see which is the problem?

2007 F350 6.0 CC LWB
6" Fabtech, 35" BFG M/T
B/W gooseneck,AMP steps
coolant filter,Amsoil bypass filter
SCT
ARP studs

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post #7 of 10 Old 04-23-2010, 06:14 AM
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Quote:
Originally Posted by genesis View Post
Mine is doing the same thing.
I have auto ingenuity but need to get it loaded on my new laptop as the old one quit me.
Can you tell me what parameters I need to put in to see which is the problem?
This is from a post by Mr. Hansen:

Set up AE to monitor ICP and IPR duty cycle and crank it over. When you first turn the key on, you should get 14% IPR, and when you crank it, ICP should come up to 500 psi plus and IPR should be probably no higher than 25% or so. If IPR goes above 35% then you may have Injector o-ring leakage. That would explain the long crank times. You may also want to check cranking RPM, which should be a minimum of 100.
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post #8 of 10 Old 04-23-2010, 07:31 AM
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Quote:
Originally Posted by dray8165 View Post
This is from a post by Mr. Hansen:

Set up AE to monitor ICP and IPR duty cycle and crank it over. When you first turn the key on, you should get 14% IPR, and when you crank it, ICP should come up to 500 psi plus and IPR should be probably no higher than 25% or so. If IPR goes above 35% then you may have Injector o-ring leakage. That would explain the long crank times. You may also want to check cranking RPM, which should be a minimum of 100.
Thanks for the quick reply!
I will check it out.

2007 F350 6.0 CC LWB
6" Fabtech, 35" BFG M/T
B/W gooseneck,AMP steps
coolant filter,Amsoil bypass filter
SCT
ARP studs

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post #9 of 10 Old 04-23-2010, 08:40 AM
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I have loaded my autoenginuity program onto my new laptop and it connects to the truck but will not do anything except check codes.
(the truck does not have any)
It will not let me select enhanced powertrain or pretty much anything else.
Anyone know if the software is protected or some thing?
I bought it several years ago and loaded it onto the laptop but it is history now.

2007 F350 6.0 CC LWB
6" Fabtech, 35" BFG M/T
B/W gooseneck,AMP steps
coolant filter,Amsoil bypass filter
SCT
ARP studs

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post #10 of 10 Old 04-23-2010, 11:04 AM
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Sure it's protected......

You've either got to find the numeric key or purchase a new license I'd think (call 'em maybe they can help)
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