Manufacturer Expertise
Ford Power Stroke diagnostics, repair & maintenance
STL Diesel works on diesel trucks in Crystal City, Missouri and serves owners and fleets throughout Festus, Herculaneum, Pevely, Hillsboro, De Soto, Jefferson County and the southern St. Louis region.
Our process starts with the customer concern, a vehicle inspection and scan data, followed by system-specific testing. We diagnose before recommending parts so the repair plan is based on test results rather than guessing.
Book an AppointmentEngines & generations we support
- 7.3L Power Stroke
- 6.0L Power Stroke
- 6.4L Power Stroke
- 6.7L Power Stroke
Call 636-465-0585 with your year, model, engine and symptoms.
Common Concerns
What we diagnose on Ford Power Stroke trucks
Fuel pressure & injector concerns
Hard starting, low rail pressure, injector contribution issues, contamination and fuel-delivery faults require testing before parts are replaced.
Turbo & boost problems
Low boost, overboost, actuator or vane concerns, charge-air leaks and exhaust restrictions can create similar symptoms and must be separated by testing.
Cooling & overheating
Coolant loss, overheating under load, fan concerns, thermostat and pressure problems are diagnosed by checking the entire cooling system.
DPF, DEF & SCR faults
Emissions warnings can involve soot loading, sensors, DEF delivery, NOx feedback, exhaust leaks or an engine problem that increases emissions.
Electrical diagnostics
Starting, charging, sensor, wiring, module communication and intermittent electrical problems are approached with scan data and circuit testing.
Engine & drivetrain repair
When testing points to mechanical engine, transmission, transfer-case or differential concerns, STL Diesel can develop the appropriate repair plan.
How STL Diesel Diagnoses
A test-first repair process
- Confirm the concern. We start with the symptoms, operating conditions, history and stored fault codes.
- Check data and basics. We compare commanded and actual values and inspect the mechanical, electrical, air, fuel and cooling systems involved.
- Perform pinpoint tests. Pressure, leak, electrical, contribution, temperature or other tests are used as appropriate.
- Explain the findings. You receive the test results and repair priorities before work moves forward.
- Verify the repair. The system is rechecked after repair to confirm the original problem is corrected.
Quick Answers
Ford Power Stroke repair FAQ
What Power Stroke engines does STL Diesel work on?
STL Diesel services 7.3L, 6.0L, 6.4L and 6.7L Power Stroke trucks. Exact service availability depends on the year, vehicle condition and repair needed.
What causes low boost on a 6.7 Power Stroke?
Charge-air leaks, turbo vane or actuator faults, exhaust leaks or restrictions, airflow sensor issues and engine-fueling problems can all contribute. Boost data and leak testing help identify the cause.
Should I replace parts just because a trouble code names a component?
No. A trouble code identifies a system or test failure, not always the failed part. The circuit, data and related mechanical systems should be tested before replacement.
Need help with your Ford Power Stroke?
Call STL Diesel at 636-465-0585 or schedule an appointment in Crystal City, Missouri.
Book Appointment