Riffraff Diesel Technical Knowledge Center
Diagnosing HPOP Issues on the 7.3L & 6.0L Powerstroke's
Aug 30th 2025
The High-Pressure Oil Pump (HPOP) is the heart of the HEUI (Hydraulically Actuated, Electronically Controlled Unit Injector) fuel injection system used on both the 7.3L and 6.0L Powerstroke. When the
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Common Hard Start Issues: 7.3 Powerstroke
Posted by Adam Blattenberg on Jul 23rd 2025
The 7.3L Powerstroke is one of the most reliable diesel engines ever built, but as these engines get older, many issues become more and more common. Hard starts being near the top of that list. But th
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Common Fluid Leaks, 7.3 Edition: Symptoms, Causes, Prevention and How To Fix Them
Posted by Adam Blattenberg on Jul 16th 2025
7.3L Powerstroke owners have always been ridiculed for marking their territory (i.e., leaking oil, leaving spots wherever they park). We’re going to plead the Fifth on the validity of that state
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7.3L Overboost Codes: How They Limit Power Output and How To Eliminate Them
Posted by Adam Blattenberg on Jul 3rd 2025
When upgrading a 7.3L Powerstroke (1994–2003) for more power, one of the first hurdles is the PCM’s built-in overboost limit, which is typically around 23–24 PSI. Exceed that, and th
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OBDII Diagnostic Trouble Codes: Common Codes And Their Potential Causes – 7.3L and 6.0L Powerstroke
Posted by Adam Blattenberg on Jun 26th 2025
In 1995 Ford began implementing the OBDII system in most of their vehicles. By 1996, due to a federal mandate, all vehicles were using the system. OBDII or On Board Diagnostics 2, gave us tons more da
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