Riffraff Diesel Technical Knowledge Center
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
… read more
7.3 Injector O-Rings vs. Injector Cups: How to Tell Which One Failed
Jul 24th 2026
A 7.3L Powerstroke can make a simple leak look like a much bigger problem. Fuel in the coolant? Oil in the fuel bowl? White smoke? Hard start? Miss? Coolant puking? Random rough running after injector
… read more
OBS 7.3 Powerstroke EOT Sensor Swap: Updating the Obsolete 1994–1997 Oil Temp Sensor
Posted by Adam Blattenberg on Jul 8th 2026
Some 1994.5–1997 OBS 7.3 Powerstroke trucks used an early-style EOT sensor that is now obsolete. If your truck still has that old Engine Oil Temperature sensor and it fails, the correct repair i
… read more
“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
… read more
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
… read more






