You may have a problem with the high pressure oill system on your truck. This TSB should help.
Please accept my answer if you are satisfied.
This TSB article is being republished in its entirety to include vehicles through the 1998 model year.
On vehicles with a 7.3L direct injection (DI) turbo diesel engine, one or more of the following concerns may be present:
These concerns may be caused by the injector cushion O-rings deteriorating, resulting in a poor seal. This condition cannot be detected with conventional diagnostics (i.e., it will not produce diagnostic codes with either Super Star or New Generation Star Testers).
Remove the injectors, check for deterioration of the cushion O-ring. If necessary, replace the O-ring with a new O-ring which has a more robust design and should not deteriorate under severe conditions. Refer to the following Service Procedure for details.
The O-ring Kit includes the following:
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage, Emissions Warranty Coverage, And Powerstroke Diesel Engine Warranty Coverage
401000, 607000, 607400, 608000, 608400, 610000, 610500, 611000, 611500, 614000, 614500
Copyright © 1998 Ford Motor Company