This topic contains 5 replies and was last updated by sean-obryan 9 years 4 months ago
December 15th, 2011 11:28pm
Hello, we have a 97' International Blue Bird with a T444E 7.3 DIESEL, Came in as a no start. Checked oil pressure 2200 PSI, FUEL PRESSURE during cranking 45psi. Will start on ether, but continued use will cuase it to backfire. replaced fuel filters, no change. Removed HPOP lines and found clean oil inside HPOP, but rest of oil is black. Oil reservoir is full. Rechecked Oil pressure and found it does climb to 2200psi, but then falls off. Thank you in advance
December 16th, 2011 2:36am
I have run into this problem with the 7.3L in Fords, and it is caused by weak injectors. If when cranking the unit there is a ton of white smoke pouring out the exhaust it is the engine not getting enough fuel, and since fuel pressure is at 45 psi the only other cause is injectors, usually if it its low oil pressure an ipr unable to build pressure during crank code would be present. I hope his helps.
December 16th, 2011 12:06pm
On the 444, where the high pressure oil lines go into the cylinder head, is a fitting, that has a small screen in that fitting. I have seen them get clogged up, and cause the same problem. It is a fast check, and easy to clean. Hopefully that is your problem
December 17th, 2011 4:37am
That was a good question: what did you see for smoke?

If there was no smoke while cranking, you need to ask if the electronics are doing their job.

If there was no smoke, that should tell you that the injectors are not being energized by the computer. You may need the proper scan tool to perform the injector buzz test to confirm that the signals are there to fire the injectors. When all the injectors that seem to fail to fire, I would think it is an electronic or computer problem.

HUEI injection systems are not easy. While the IH and Ford HUEI systems are different, this site may help: http://powerstrokehelp.com/

By the way, using ether on these systems is definitely a bad idea.
January 3rd, 2012 2:14am
Hi there did you figure out? Let us know what was the problem. All the best.
January 27th, 2012 10:35pm
Hi Did you check for codes ? A bad CAM Sensor will cause a no start.