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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

Cummins EGR Operation theory
11/24/2021 in the HD/Fleet Forum
Read a trade magazine on my lunch break. The author stated "the Cummins 6.7L EGR system....in certain engine conditions, exhaust gases are cycled through the engine a second time to burn any remaining pollutants from the initial internal combustion." Was ...
Brake Pull-Hydraulic Brakes
11/22/2021 in the HD/Fleet Forum
[Brakes: 00 GMC C6500 Topkick C6H042 7.4L] Former Uhaul truck. Pulls left. New front calipers, pads, rotors and hoses. With my pressure gauges hooked up to the front calipers the left side is 900 PSI higher than the right. I followed the lines back to th...
Glow plug control module
11/19/2021 in the HD/Fleet Forum
[Electrical: 06 Isuzu NRR 5.2L] when starting cold the glow plugs kick on for less than a second, and when I turn them on with scanner I get the same thing. My question is does anyone know where the controller is? Mitchell shows it mounted on the engine ...
2010 Int Maxxforce
11/19/2021 in the HD/Fleet Forum
This is the first one i have had. Blowing oil, water out exhaust, this looks like has 2 egr coolers . Have not had a change to get in shop yet Just looking to see if any one has had fun and games with one of these. Vin# [...] . Thought might save my me so...
trw355 brake system info needed
11/19/2021 in the HD/Fleet Forum
I have this 2011/12 terrastar with trw355 brake system which came in with bad masters cylinder. The pump ran constantly with key on and brake pressure light on dash along with abs. I replaced the master cylinder, the pressure switch on the hydra side and ...

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