The 7.3 Powerstroke is commonly known as the Legendary 7.3 as it is the largest diesel engine put in high-production and consumer-grade trucks. Additionally, it is also widely considered the 2nd most reliable diesel produced, coming in behind the 5.9L Cummins produced from 1989 to 2007.

The famous 7.3 Powerstroke Diesel engine can provide several years of trouble-free service, primarily when adequately maintained. However, several problems arise with 7.3 Powerstroke in terms of 7.3 Powerstroke performance on the road. While the cost of a new 7.3 Powerstroke engine can bring about more expenses on one's wallet, 7.3 Powerstroke specs such as its HEUI (hydraulic electric unit injector) injection system promises improved performance on the road with lower emissions and better fuel economy, which is rooted in increased fuel atomization.

While this diesel engine earns relatively high marks for its reliability, there can still be some common problems in the performance parts for the 7.3 Powerstroke diesel engine. They are significant engines, but there are times that issues can still happen and emerge. Fortunately, most of these issues on the 7.3 Powerstroke engine are relatively cheap and straightforward fixes. Listed below are some of the common problems of the 7.3 Powerstroke Diesel engine. It also includes its symptoms and how they can be fixed for better performance on the road.


Injection Pressure Regulator Valve (IPR)

The Injection Regulator (IPR) Valve on the 7.3 Powerstroke engine is located in the High-Pressure Oil Pump (HPOP) valley, which can become sticky when seals fail, sensors fail, or wires become damaged. When dealing with such issues, it is advisable to identify and inspect the IPR Valve for any loose or damaged wires and check that the tin nut on the back of the IPR sensor is not open. Additionally, when reinstalling the IPR unit torque, avoid using the sealer on the IPR threads and take note of the orifice in the threaded area that the sealer could plug.

Injector Driver Module (IDM) problems

On the driver's side fender, the engine's Injector Driver Module (IDM) is situated. The Injector Driver Module, or IDM, can fail or become damaged by water, resulting in a no-start or harsh running condition, as well as cut-outs in revving/rpm. As a result, it is critical to inspect the IDM for broken wiring, dampness, or water penetration to ensure that it is in good working order and ready to go on the road.

Cam Position Sensor (CPS) Failure

With a faulty or damaged 7.3L Powerstroke CPS, the diesel engine may cut out and eventually die. The machine may refuse to start until it has sat or the batteries have been reset. Fortunately, there are a few ways to ensure that the CPS in your engine is in good working order. Check the Old Body Style (OBD) by watching how your tachometer moves while cranking. If it moves, it indicates that your CPS is in good shape. If it is not, however, this may be a hint that you should replace it. The cam position sensor is the most frequently encountered issue on the 7.3L Powerstroke.

Under Valve Cover Harness (UVCH) Connectors

Another typical issue on the 7.3 Powerstroke is a loose or shorted Under Valve Cover Harness (UVCH). It can create difficult operating circumstances, causing the truck to lope severely on the road and frequently die and splutter. Due to the fact that these connectors are located behind the valve cover, it is a good idea to replace the valve cover gaskets when this issue develops. One technique to resolve this issue is to visually inspect the four connectors for severed wires and loose or burned connectors that need to be replaced.

Fuel Filter Clogging

When the 7.3 Powerstroke diesel engine's fuel filter becomes blocked or clogged, it frequently results in prolonged cranking or a loss of power, especially if the injectors cannot receive the gasoline they require to function. As a result, it is optimal to replace the gasoline filter when this occurs.

Exhaust Back-Pressure Valve (EBPV) Failure

The Exhaust Back-Pressure Valve (EBPV) on the engine is a butterfly valve positioned on the turbocharger outlet. The valve is controlled by a turbocharger actuator, which reduces the time required for the engine to reach its normal operating temperature.

When the engine is cold, the actuator can instruct the valve to close, providing the same amount of back pressure as if the machine were loaded. As a result, it might result in the accumulation of hot exhaust air inside the engine, thereby warming it up faster. Additionally, the system frequently leaks oil, necessitating a rebuild of the machine's whole EBPV system.

Fuel Heater Problems

The absence of the "wait indicates a blown a fuse to start" light when the key is switched to the run position. Additionally, the engine's fuel heater can short out, blowing maxi fuse #22 and so deactivating the PCM. When this occurs, it is recommended that you first disconnect the fuel heater and then replace the fuse before restarting the engine. The fuse is simply replaceable, as it only costs approximately $3. Additionally, it is a good idea to keep spare fuses and maxi fuses in the glove box to avoid leaving your 7.3 Powerstroke stranded on the road.


Overheating is thought to be a common concern with the 7.3 Powerstroke engine. Numerous causes can contribute to overheating, including problems with the radiator, thermostat, water pump, cooling fan, or insufficient coolant. The unmistakable indicators of overheating might be quite obvious. As a result, it is critical to stop driving the vehicle until the 7.3 Powerstroke's overheating concerns are remedied. When determining the reason for overheating, begin with the obvious, such as any apparent coolant leaks from the engine.

Lift Pump Problems

Failure of the lift pump can result in the engine failing to start. One approach to check for this issue is to check the bowl for gasoline both before and while cranking, and then turn the key on and observe the bowl filling. However, if the key is kept on for an extended period of time, it will leak into the engine compartment, so having a friend nearby to switch the key off is beneficial. If the engine is not starting due to a lack of energy in the bowl, it is best to fill the bowl with clean gasoline and replace the pump.

See here the compatible products for the 7.3 Powerstroke Diesel engine.