I have a 7.3 that I have been having trouble with spent about 4000. on it at Ford Dealers and other shops.The oil pump has been changed two times and every sensor that they could sell me.The problem is it will start and run great say 15 times then the next time it wont start.It is if it runs out of fuel.You can spray starting fluid in air cleaner and it will start and run till next time.any help would be greatly appreciated.PS I have tryed all types of oil ? THANKS

 

STOP SPENDING YOUR MONEY! Are you using the correct 15w40 designated for PSD? Rotella 15w40 is my preference. If you research this site you will find most root causes of problems are incorrect maintenance practices, I.E. motor oil without anti-foam properties, coolant without anti-congelate, etc. Hang in there, the PSD top techs on this great site will help you out!
Thanks, Tony D.

 

First off stop using starting fluid to get her started because you will be replacing a engine soon or worse you can get hurt. Has your SES light been on? When your truck is running do you see any white smoke?

 

Before we can help you out we need to know:

Whatoil are you using? Is it a cold weather start problem? Is there smoke and what color is it? Does the check engine light come on? have batt. cable connections been checked - especially the ground connections? Sounds like a loose wire connection to pcm or idm modules. Give us more info. to work with. Also you can go to Dieselman.com and ask him for help, he is the powerstroke guru. HANG IN THERE!!!!

 

yes I am using Shell 15-40 and it is not a cold start problem it can be 90 in Houston,Tx.and it well not start.And it does't smoke when trying to start When it does this, it will start up but acts like it is running out of fuel,sometimes if you catch it in time and run it up to about 1000 rpm's it will smooth out and run great.Thanks

 

I went to Dieselman.com but did'nt see a help link ????

 

Do you have access to a scan tool that you can use to see what ICP is reading when you can not start the truck? Or next time you can't start the truck check to see what the oil level is in the HPOP reservoir?

 

I don't know if that has been checked but I will ask tomorrow.Thanks

 

What's an HPOP might be a dumb question though.

 

HPOP - High Pressure Oil Pump

 

The HPOP has been changed two times but the shop were it is,was closed for the week-end don't know if the oil level in the reservior was checked or if that is possible? Come On Guys OOPS and Gals I need HELP .

 

I found this somewhere: Test 3: Turn the key and the starter and engine turn over, but the engine won’t start. This is a most likely a computer or fuel injector problem.
Step one, open the drain on the fuel filter / separator and see if fuel and/or water comes out. Is it water, diesel or gasoline? If water or gasoline comes out, the injectors may be ruined. In that case, call for a tow and get out your wallet. If no fuel comes out, do you hear the fuel pump running when you turn the key on? If the fuel pump is running but not pumping fuel then you could be out of fuel, have a plugged fuel filter or a damaged fuel line restricting the flow of fuel.
Step two, check your fuel gauge. The fuel gauge may be stuck on "Full", so to be on the safe side, just pour in that spare 5 gallon can of diesel that you carry in the tool box. Do you have diesel fuel in the tank now? If no fuel, get a tow or a ride to a fuel stop, you know what to do when you get there.
Step three, if the engine won’t start when it cranks over and the tach stays at zero, the Camshaft Position Sensor (CPS) is dead (except on 2002's, where the tach is dead until the engine starts). The Powertrain Control Module (PCM) must see at least 100 RPM for the PCM to send injection signals to the Injector Driver Module (IDM). Slow cranking speed could be caused by low batteries or loose / dirty battery connections.
Step four, it could also be that the fuel injectors are not firing because the High Pressure (HP) oil system has less than 375 PSI or the pulses are not getting to the injectors. The injectors are hydraulicly operated and controlled by a signal pulse that turns them on. If the HP oil pressure is less than 375 PSI there is not enough pressure to inject the fuel.
Step five, if the HP oil system pressure doesn’t come up, the pump may be bad, out of oil, or the pressure regulator is bad. It could also be that you have 15W40 oil in a cold climate. use 10W30 in freezing temperatures to prevent this problem.
Step six, if the injectors do not get the signal to fire, the PCM or the IDM may be bad or have no power. Check the PCM power fuse 30, the diode, fuse 34 and the IDM fuse 27 may be open, too. Last, the PCM power relay may be bad.

 

Do you know why the shop has changed the HPOP twice? That does not sound right they don't just go bad that quickly.