Ford’s 6.7 powerstroke is one of the most reliable engines you can buy. The 6.7 is designed to withstand the rigors of long-term use and still provide years of service.
Despite their reliability, there are some common problems that can arise with the 6.7. Some of these issues are expensive and can cost you a lot of money in repairs.
Injection Pump
The injection pump is responsible for the delivery of atomized fuel to each engine cylinder. This fuel is then injected into the injectors for the requisite amount of time.
Injection pumps can vary the timing of their injection delivery based on engine rpm and a centrifugal regulator. This varies the injection delivery with engine rpm, which results in increased power at higher rpm and improved economy at lower rpm.
Some pumps use a pressure control valve located at one rail extremity (pump-external PCV) and other pumps use a pump-integrated PCV that throttles the fuel flowing into the injectors as well as the fuel from the lubrication and cooling circuits of the injection pump. This combination of throttled and non-throttled fuel allows the injection system to control rail pressure with a minimally invasive approach. This can improve hydraulic efficiency and reduce generation of excessively high fuel temperatures. It may also help to avoid the need for a high pressure regulator.
EGT Sensors
Exhaust gas temperature sensors (EGTs) are essential to a diesel engine’s performance. They help keep the engine’s exhaust system from overheating and causing problems.
Several types of EGT sensors are available, including positive temperature coefficient (PTC) and negative temperature coefficient (NTC) elements. PTC elements increase in resistance as temperatures rise, while NTC elements decrease with temperature.
The type of sensor used in a vehicle’s exhaust system will depend on its function and location. They are designed to withstand heat and vibration and are hermetically sealed.
Premier Auto Trade distributes a number of different EGT sensors for various models of vehicles throughout Australia and NZ. They are manufactured and tested to meet vehicle manufacturer specifications and offer OE form, fit and function.
When your 6.7 powerstroke low fuel pressure/reduced engine power is triggered, it’s important to diagnose the problem as quickly as possible. The exact causes of the reduced engine power mode will vary by year and model, so it’s best to perform a proper diagnosis before trying to fix the issue.
Fuel Pump Regulator
If you’re having low fuel pressure or reduced engine power, it might be time to check your fuel pump regulator. It’s a critical part of the fuel delivery system that keeps the injectors at the correct pressure.
A faulty regulator may cause your vehicle to run rich, which can lead to poor fuel economy and emissions issues. In extreme cases, the faulty regulator can even lead to black smoke from the tailpipe.
Typically, fuel regulators are vacuum-operated mechanical diaphragms that allow the device to change fuel pressure according to driving conditions. However, electronic fuel pressure regulators are also available.
To install a bypass regulator on a carbureted system, connect the return line from the top of the gas tank to the bypass port of the fuel pressure regulator, as shown below. The regulator will also need a vacuum line to connect to the engine vacuum, which allows the system to vary fuel pressure as needed.
Fuel Injectors
Your fuel injectors spray a very fine mist of gasoline into your engine, mixing it with the air before it enters the combustion chamber. Over time, your fuel injectors can get clogged and dirty, causing poor performance and gas mileage.
Your vehicle’s fuel injection system is a complex and important part of the engine’s functionality, so it’s crucial to have it serviced regularly. Here are some signs to look for that indicate your fuel injectors need a checkup and cleaning.
Rough idling and sudden decrease in fuel supply during acceleration are often the first indications that your fuel injectors need service. This is because your fuel pump must build enough pressure to ignite your engine when you’re accelerating, but a faulty injector may not be able to do that.
A fuel injector consists of the following parts: an injector body, a plunger, and a solenoid coil. The solenoid coil opens the injector when it receives current pulses from the Engine Control Unit (ECU). Once the nozzle is open, fuel from the pressurized fuel chamber flows to the cylinder.