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Automotive HD/Fleet Forum

Professional automotive forum for discussion of heavy-duty trucks, buses and other on- and off-road equipment, and maintenance of automotive fleet vehicles. Discussion topics include fuels and lubricants, hydraulics, performance, on-board diagnostics, powertrain, power distribution, anti-lock braking and stability control systems, and best practices as they relate to heavy duty and fleet maintenance. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the HVAC Forum.

Recent Automotive Discussions in the Automotive HD/Fleet Forum

7.3 HPOP ?
03/03/2026 in the HD/Fleet Forum
[Driveability: 99 Ford F-350 Super Duty Lariat 7.3L] Died while driving- towed in. P1280 High pressure oil issue- Scanner shows 0 high pressure- replace pressure sensor in head and IPR regulator- both Genuine ford parts. Still no pressure, 60 psi engine ...
Series 60 clutch conversion question
02/27/2026 in the HD/Fleet Forum
I have a friend that tried to switch from a 14in pot style clutch to a 15 in flat clutch on a 2000 freightliner with a series 60 engine Now he is saying it will not start he is saying that you can hear the starter but engine does not Rotate I'm guessing a...
8 Way Lights
02/26/2026 in the HD/Fleet Forum
[Electrical: 11 IC Corporation BE School Bus 6.4L] Any one have info. on the 8 way light system on this IH bus? The ambers come on but flash together instead of alternating. Reds operate correctly when door opens.
2023 Western Star 47X Mirror Antenna
02/12/2026 in the HD/Fleet Forum
How do I disassemble the damn mirror to replace the antenna wiring cable?
MD/HD scan tool
02/09/2026 in the HD/Fleet Forum
[Driveability: 20 Mitsubishi Fuso Canter FE160 FEC72S 6.0L] Does anyone know with any certainty what scan tool will communicate with a 2020 Mitsubishi Fuso FE 160 with a GM 6.6 gas engine and an Allison 1000 trans? Thanks for any help.

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