2003 6.0 will not start. - Ford Powerstroke Diesel Forum
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Old 01-29-2008, 03:59 PM
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2003 6.0 will not start.

I have a 2003 F350 6.0 4x4 daully. It has 200,000 miles and is always looked after. I tried to start it after a long drive, but it just cranked over. I checked the batteries, no problems. Checked the fuel pump, no problem. I called the Ford dealer and was told it had a bad oil pump, not enough pressure. I then changed the oil pump and both oil presure lines to the injectors. Still would not start I had a mechanic run a diagnostic test with the computer scope,there where a few codes that showed nothing to do with the starting problem. I then installed new O rings on all the injectors, still will not start. I have done everything but rebuil the motor. Can some one help.
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Old 01-29-2008, 04:01 PM
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what were the codes?? How cold is it where you are?? have you tested the glow plug system?? how long did you crank it after the injector replacement...it can take a few cranking cycles to get them to fire.....

are you positive you have good fuel pressure??
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Old 01-29-2008, 04:56 PM
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Hi Marc,
I am in Southern California, temp is 55 dgrees, we have tested the glow plugs ,they are OK. We hooked up 2 battery chargers and cranked every 30 mins for most of the day. Fuel pressure is very good. P0480 and P0649 are the codes.
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Old 01-29-2008, 05:06 PM
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do a compression test,if there isnt enough ,it wont start.
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Old 01-29-2008, 05:12 PM
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do you have any way to monitor the ICP??
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Old 01-30-2008, 09:09 AM
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P0480--fan control circuit P0649--cruise control lamp circuit

Are you getting any smoke as you crank? Does the oil gauge on the dash come up to pressure? Which oil pump did you replace--low pressure or high pressure?
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Old 01-30-2008, 09:32 AM
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I had this problem last week, I had to replace the IPR not enough oil pressure to start, I only had 250lbs, you need to monitor the Icp, when it starts it should jump up to about 2000, I do believe but could be wrong.
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Old 01-30-2008, 04:44 PM
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2003 F350 6.0

I replaced high pressure oil pump. The gauges reads high pressure. No smoke when cranking. I am now check the electrical system.
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Old 01-30-2008, 04:45 PM
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To start you need at least 350-400 psi icp to start. Sounds like maybe a injector is leaking. If the problem is icp. But if it was icp it should throw a code unless there is a wiring problem to the ipr. An open curcuit to the ipr wont throw a code. Double check fuel pressure first.
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Old 01-30-2008, 05:10 PM
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We have more than 500 PSI, removed all injectors and installed new O rings. Fuel pressure is good. Replaced high pressure oil lines to injectors.
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