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Ford’s 7.3 liter Power Stroke diesel engine is legendary. It was available on the 1999-2003 Super Duty F-250 and F-350 trucks and has been known to last over 500,000 without major issues. But as these engines accumulate kilometers, owners have common problems with them. Hey, nothing lasts forever. Some of these issues are to be expected once you get into the 200,000 or 300,000 mile club.
The good news is that many of these 7.3 Power Stroke problems can be fixed on your own. And so some components should be replaced regardless of whether they work if you happen to have a free Saturday. In general, your 7.3 should soldier on for another 100,000 miles or more if properly maintained.
7.3 Power gear cam position sensor
The cam position sensor or CMP is probably the most common problem with older 7.3L diesel engines. But the good news is that they are cheap and easy to replace, just don’t buy the gypo sensors. Get a genuine Ford replacement. If the CMP fails, the engine will not start.
To determine if your problem is with the CMP, see if the cylinder moves when you start the engine. If so, your CMP is working. Otherwise, replace it. And they’re cheap enough that you can buy a spare and keep one in your truck just in case.
Injector pressure regulator valve
A common problem is the injection pressure regulator valve or IPR. These solenoid valves control the oil pressure going to the fuel injectors in the HEUI system. They adjust the individual injectors according to the needs of the engine.
Gaskets can become damaged or worn, causing them to stick. Pressure sensors can also wear out, and exposed wires sometimes lead to damage. However, they are easy to replace as they are located in the valley of the high pressure oil pump. However, Diesel IQ cautions against using a thread sealer as there is a hole in the thread that must remain open.
Injector Driver Module
The Injector Driver Module, or IDM, is easily accessible, located on the driver’s side fender of the Super Duty. Power Stroke’s IDM turns the injectors on and off. It receives its commands from the Powertrain Control Module or PCM.
The main problem is that over the years, water can contaminate it, causing malfunctions. These cause rough running and sometimes a no-start situation. There are stores all over the country that can rebuild them and also upgrade them.
7.3 Power train under valve cover Harness connectors
UVCH connectors usually become loose or start to short out. This can make the engine feel like the timing has slipped and in some cases cause sputtering. After removing the valve cover, check the wires for loose or burnt connectors. If you remove the valve covers, replace the gasket. You usually get valve cover kits that include plugs.
The fuel filter gets clogged
Another common problem that is easy and cheap to fix. This usually manifests itself as a loss of power or a hard start. The filter must be changed regularly.
Injector control pressure sensor
The ICP sensor controls the pressure required to move fuel into the engine. Oil in the sensor can cause stalling, rough idling, or sputtering. An easy way to determine if the ICP sensor is faulty is to disconnect it. If the problems are gone, replace them. In any case, be sure to plug it back in after testing.
RELATED: Legendary Ford 7.3 Power Diesel: The Good and the Bad
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