Riffraff Diesel Technical Knowledge Center
7.3L Powerstroke VSS Rear Axle Speed Sensor: Problems, Related Codes, Diag And Replacement
Aug 18th 2026
A bad rear axle speed sensor can cause a lot more than a dead speedometer on a 1994–2003 7.3L Powerstroke. The rear VSS signal is used for vehicle speed, ABS operation, and automatic-transmissio
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Riffraff Diesel Valve Spring Compressor Tool for 1994–2003 7.3 Powerstrokes
Aug 17th 2026
Valve spring work on a 7.3 Powerstroke is not hard because the job is complicated. It’s usually a job done with the heads off, and with a large specialized tool. But if the truck runs fine, taki
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Donaldson Blue vs. Motorcraft: Ford 7.3 Powerstroke Oil Filters
Aug 13th 2026
We sell both the Donaldson Blue DBL7405 and the OEM Motorcraft FL-1995-A for the 1994–2003 7.3 Powerstroke. Neither is a filter we’d hesitate to run. They’re just built with differen
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Riffraff/Eaton 7.3 Powerstroke HPOP JIC Lines - What's the real difference?
Aug 12th 2026
The factory 1999–2003 7.3 Powerstroke HPOP lines use quick-connect fittings at the cylinder heads and high-pressure oil pump. They worked, but after more than 20 years of heat, vibration, oil ex
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Exhaust Back Pressure Tube Issues for the 1999–2003 7.3 Powerstroke
Aug 9th 2026
The 7.3 Powerstroke exhaust back pressure tube connects the passenger-side exhaust manifold to the EBP sensor mounted near the front of the HPOP reservoir. That tube lets the sensor read exhaust press
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