Riffraff Diesel Technical Knowledge Center
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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Top 10 7.3 Powerstroke Oil Leaks That Get Mistaken for a Rear Main Seal
Jun 2nd 2026
The 7.3L Powerstroke has a gift for making one leak look like another. Oil starts high, runs down the valley, follows the back of the block, coats the bellhousing, and suddenly everyone is yelling &ld
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OBS 7.3 Powerstroke TP38 Turbocharger Rebuild: Step By Step How To
May 29th 2026
Parts Required:
TP38 360 Bearing Rebuild Kit 94-97: Part# TP-360-OBS
Recommended Parts/Tools:
Riffraff Diesel Billet Compressor Wheel 94-03: Part# RDP170293
Garrett TP38 Compressor Housing
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