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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

Replacing the crank and lower shirt 60K miles
06/11/2024 in the HD/Fleet Forum
[Engine: 12 Isuzu NRR 5.2L] I have a 2012 Isuzu NRR 5.2 4HK1TC and the crank is pretty wiped out. This is a personal/side project. It looks like the #3 rod bearing went first and sent crap throughout the crank. I believe the root cause was the EGR cooler...
06/06/2024 in the HD/Fleet Forum
2000 F350 with 7.3L and 252,000 miles. Customer just purchased it recently. On a trip it developed a fuel leak and ignited a varmint nest in the valley. Had a bad engine fire. Repaired wiring, sensors, high pr. oil lines, pump, ipr and icp. Starts great-s...
turbo actuator install message holset
05/31/2024 in the HD/Fleet Forum
I keep getting this message while attempting to install an actuator on isb6.7. I am using ancel hd scanner. "TIS install required" when i select the install button it goes active then fails and gives me this message. What is "TIS install required" This is...
Mack Regen issue
05/29/2024 in the HD/Fleet Forum
I have a Mack with a blinking regen light. VIN [...] Does not respond to the regeneration switch on the dash. Performed parked regeneration with Tech Tool to complete but still has the flashing regen lamp on the dash and the switch. No fault codes. Thinki...
Parking Brake Does Not Engage in Park
05/29/2024 in the HD/Fleet Forum
[Brakes: 19 Freightliner M2 106 6.7L] I am working on a '19 Freightliner M2 with an Allison 1000/2000. When working properly, when you put the gear selector in "PB", the PP1 valve is supposed to get air supplied to the back and automatically engage parki...

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