Ford Truck Enthusiasts Forums - 7.3L / 6.8L V8 Gasoline Engines https://www.ford-trucks.com/forums/ Discuss the new 7.3 and 6.8L Gasoline V8s en Fri, 22 May 2026 05:48:35 GMT vBulletin 60 https://www.ford-trucks.com/forums/images/light/misc/rss.jpg Ford Truck Enthusiasts Forums - 7.3L / 6.8L V8 Gasoline Engines https://www.ford-trucks.com/forums/ 7.3 Issues https://www.ford-trucks.com/forums/1804069-7-3-issues-new-post.html Tue, 05 May 2026 16:38:39 GMT Im at the end of my knowledge and diagnostics with my truck. 2022 F600 7.3 rollback. 109k on the clock, 60k on replacement motor from ford. Recently under load, the truck started with cel flashing,... Im at the end of my knowledge and diagnostics with my truck. 2022 F600 7.3 rollback. 109k on the clock, 60k on replacement motor from ford. Recently under load, the truck started with cel flashing, loss of power and code P0171, and cylinder 1 & 7 misfire. I replaced pcv and hose, all new coils, new updated wires, and new plugs.

Now, when I accelerate and get over 3k rpm, cel flashes. Loss of power, and still cylinder 1 & 7 misfire and random misfire. When I ease off throttle, light goes out and truck runs smooth. Did a compression test, all.good. using a top of the line snap on scanner, I checked injectors, fuel pressure, and other possible fuel issues.

What am I missing before I take it to the dealership? ]]> 7.3L / 6.8L V8 Gasoline Engines Enf0rc3r570 https://www.ford-trucks.com/forums/1804069-7-3-issues.html 2025 6.8 Failure https://www.ford-trucks.com/forums/1803820-2025-6-8-failure-new-post.html Wed, 29 Apr 2026 02:40:18 GMT We'll be tearing this one down soon. 2025 F250 6.8 with 46k. Came in for a check engine light concern, i guess they couldn't hear the rattle. Misfires on 1 and 5. This is borescope on cylinder 5. Unacceptable photo for prior approval as the VIN has to be included in the picture so the customer will be down for the duration of getting every little shred of evidence they(Ford) can think of. Maybe I'll pull the pan and take a peak at the crank's casting line to see if its forged or cast...
We'll be tearing this one down soon. 2025 F250 6.8 with 46k. Came in for a check engine light concern, i guess they couldn't hear the rattle. Misfires on 1 and 5. This is borescope on cylinder 5. Unacceptable photo for prior approval as the VIN has to be included in the picture so the customer will be down for the duration of getting every little shred of evidence they(Ford) can think of. Maybe I'll pull the pan and take a peak at the crank's casting line to see if its forged or cast...
]]> 7.3L / 6.8L V8 Gasoline Engines SMSTX https://www.ford-trucks.com/forums/1803820-2025-6-8-failure.html