Riffraff Diesel Technical Knowledge Center
Bullet Proof Diesel EGR Coolers for 2003–2007 6.0L Powerstrokes
Jun 27th 2026
The factory 6.0L Powerstroke EGR cooler is a common failure point, especially when the oil cooler plugs and restricts coolant flow to the EGR cooler. When that happens, owners may see coolant loss, wh
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PHP Hydra Chip for 7.3 Powerstroke: What It Does, How to Install It, and When Custom Tunes Matter
Posted by Adam Blattenberg on Jun 26th 2026
The PHP Hydra Chip is one of the most popular tuning upgrades for the 1994.5–2003 Ford 7.3L Powerstroke because it fixes one of the biggest complaints these trucks have from the factory: lazy dr
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“My 7.3 Cranks But Won’t Start” — Symptoms, Codes, Things To Check, and a Diagnostic Tree
Jun 26th 2026
A 7.3L Powerstroke that cranks but won’t start does not automatically need a cam sensor, injectors, or an HPOP. It needs diagnosis. The 7.3 is simple compared to newer diesels, but it still need
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Top 10 4R100 Problems 7.3 Owners Should Fix Before Towing Season
Posted by Adam Blattenberg on Jun 17th 2026
The 7.3L Powerstroke will usually drag the trailer wherever you point it. The 4R100 however, needs a little more respect. It is not a bad transmission by any means, but heat, old fluid, weak cooler ca
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S&B OBS 7.3 Powerstroke Cold Air Intake Kit 94–97
Jun 17th 2026
The factory 1994–1997 OBS 7.3 Powerstroke intake gets the job done, but it is not exactly known for airflow. The S&B OBS 7.3 Powerstroke Cold Air Intake Kit gives the truck a cleaner, less r
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