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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

Hunting for aVSS old school
05/23/2019 in the HD/Fleet Forum
Have a 1996 Pete 379 in for a clutch. Cruise also won't work and Jakes don't kick in. Has an active Cummins DTC of 241. A VSS circuit or sensor fault. Anybody know of a site that lists VSS's by size, style and Ohm reading? The VSS coil is bad. OL on the m...
Looking for Duramax 6.6L LML/LGH Engine Injector Waveform
05/23/2019 in the HD/Fleet Forum
Good morning, Has anyone captured a voltage and current waveform of the fuel injectors from the 6.6L LML/LGH engines? Not finding anything in the waveform database. Here is a list of applicable vehicles: LML Model MAKEMODELVEHICLE MODELYEAR OF SERVICE [.....
7.3L diesel HPOP testing
05/21/2019 in the HD/Fleet Forum
Hi Guys, Could someone please be so kind as to give me some tips on dead head testing a high pressure oil pump on a 2002 7.3L. I have one hose plugged, I have a 5000 psi gauge hooked to the other hose. Do I simply crank the engine over while observing the...
Cooling system operation
05/16/2019 in the HD/Fleet Forum
[Engine: 05 Freightliner M2 106 6.4L] Trying to get some information for a customer about this truck, it's used to pull a side dump trailer, the engine is a Mercedes. History is the water pump failed last December, pump and thermostats were replaced, tru...
KW Turn Sigs
05/16/2019 in the HD/Fleet Forum
Can anybody help with a lighting schematic for a 2010 KW T-800 [...] Got LS turns out, trying to id wires Thanks, H.

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