Won't Run - Ford Powerstroke Diesel Forum
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post #1 of 25 Old 01-05-2008, 09:18 AM Thread Starter
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Won't Run

I just bought a 99 7.3 from a person that had a problem and got discusted. He replaced the Computer and the oil pressure pump Not sure about the fuel pressure regulator. It will start if you spray fuel oil into the air filter hose but it smells very lean when it starts and it spews out smoke out of the exhaust (light color) It then dies and won't start unless you let it sit until the next day. It runs awful You have to race it in order to start 1600 RPM. I have taken it to a shop and they say the pump is bad but it was just replaced ?? It only has 80,000 miles .. After reading I'm thinking CPS but I'm not sure .. Any ideas what to check ? Could they have messed up the pump instlation ?
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post #2 of 25 Old 01-05-2008, 09:29 AM
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Sounds like the fuel pump is bad since you replaced the high pressure oil pump. Scan for any codes and get a fuel pressure test done. If you look directly underneath the drivers side door on the frame rail is the pump. Cycle the key to the wait to start position and see if you can hear the pump running.

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ATS Compressor and 1.0 Exhaust housing high flow back plate
Turbo Back 4" Silverline Exhaust Mbrp Muffler Delete
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post #3 of 25 Old 01-05-2008, 09:29 AM Thread Starter
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Won't Run

I said CPS but meant CMP Camshaft positon sensor but you pro's knew that didn't you
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post #4 of 25 Old 01-05-2008, 09:30 AM
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Actually its the same thing

2002 F-250 4x4 EC, SRW, SB
Auto 93,000 miles
DP Tuner F5
ATS Compressor and 1.0 Exhaust housing high flow back plate
Turbo Back 4" Silverline Exhaust Mbrp Muffler Delete
Isspro Trans,Pyro,Boost Triple Pod
Fumoto Oil Drain Valve
AIH Delete With Boost Fitting


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post #5 of 25 Old 01-05-2008, 09:39 AM Thread Starter
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Yes we checked that It the pump is running and it fills the fuel filter up too. I have no scanning tool and the shop I took it to wants to start throwing parts at it I told them to hold on Lets get some information.
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post #6 of 25 Old 01-05-2008, 09:42 AM
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Fuel filter was replaced also? What were the codes your mechanic retrieved before he decided to throw parts at it?

2002 F-250 4x4 EC, SRW, SB
Auto 93,000 miles
DP Tuner F5
ATS Compressor and 1.0 Exhaust housing high flow back plate
Turbo Back 4" Silverline Exhaust Mbrp Muffler Delete
Isspro Trans,Pyro,Boost Triple Pod
Fumoto Oil Drain Valve
AIH Delete With Boost Fitting


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post #7 of 25 Old 01-05-2008, 09:48 AM Thread Starter
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Yes we replaced the filter I'm not sure what the codes were that he had but I think he said something about low fuel pressure . I told him the pump had just been replaced but I suppose it could be defective .
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post #8 of 25 Old 01-05-2008, 09:49 AM
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If you can get #5 o-ring boss hydraulic fitting, hydraulic hose, and a 0-5000 psi gauge (cost ~25.00-30.00) remove a oil gallery plug in the head, and connect gauge. Pressure should get over 500psi in a crank or two, if not, there could be a problem with the IPR injection pressure regulator sticking open, or other HPOP system fault.

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post #9 of 25 Old 01-05-2008, 09:52 AM
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Check the pressure regulator at the fuel filter return line for any debris or a split o-ring also.

2002 F-250 4x4 EC, SRW, SB
Auto 93,000 miles
DP Tuner F5
ATS Compressor and 1.0 Exhaust housing high flow back plate
Turbo Back 4" Silverline Exhaust Mbrp Muffler Delete
Isspro Trans,Pyro,Boost Triple Pod
Fumoto Oil Drain Valve
AIH Delete With Boost Fitting


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post #10 of 25 Old 01-05-2008, 09:58 AM Thread Starter
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I remember he told me he checked the pressure at cranking and it was 400 pounds but the batteries were low too I'm not sure if he checked for split O rings
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