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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

E-One steering, Granning FE suspension
03/25/2026 in the HD/Fleet Forum
Hi HD, We have an E-One fire truck in here with a Reyco Granning front suspension. Came in because has a mind of its own. Customer installed new main and slave boxes. Same problem. If you are turning left and let go of the wheel it keeps turning. Same wit...
Need help with 6.7L Powerstroke
03/13/2026 in the HD/Fleet Forum
[Engine: 17 Ford F750 6.7L] Need help with a Ford 6.7L Powerstroke Vin E in a F750. I have a cracked head, customer said he didn't have time to get the coolant leak fixed…. Anyways, what is the difference between a Vin T and a Vin E engine? I can f...
Bobcat Joystick #7126558 Upgrade Kit
03/12/2026 in the HD/Fleet Forum
Hi. A customer has an A300 skid steer. Right joystick had an intermittent problem. He bought a new upgrade kit because old joysticks aren't available anymore. He brought skid steer and kit to me to install. Installed kit and now nothing works. Multiple co...
Scan tool Communication
03/10/2026 in the HD/Fleet Forum
[Driveability: 01 Isuzu NPR 4.8L] This NPR has a 16 pin OBD2 DLC, but some things I read said only the gassers were OBD2 compliant in 2001. I have tried two Heavy Duty OBD2 scanners that listed the Isuzu as compatible, but no communication. I read Diesel...
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 ...

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