Riffraff Diesel Technical Knowledge Center
Riffraff Diesel Billet HPOP Reservoir Cover for 1999–2003 7.3 Powerstroke
Jul 3rd 2026
The 7.3 Powerstroke HPOP reservoir cover is one of those small parts that gets annoying fast when the fill plug is stripped, the cover is tired, or the reservoir needs to be topped off without making
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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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OBS 7.3 vs. Super Duty 7.3 Differences That Matter When Ordering Parts
Jun 27th 2026
The 7.3L Powerstroke ran long enough that people started treating all of them the same. That is how wrong parts get ordered.
A 1996 OBS 7.3 and a 2002 Super Duty 7.3 share the same basic engine family
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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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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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