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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

Need verification of a Duramax LB7 injector drive waveform
03/15/2019 in the HD/Fleet Forum
Morning, Wondering if anyone has a injector current waveform from a Duramax LB7. I am questioning the trace that I have do to the peak being lower than the hold. This was taken at idle. Looks like a pilot injection followed by the main injection. This is ...
Circuit Tracer
03/13/2019 in the HD/Fleet Forum
What is the best circuit tracer? I have a 2016 Thomas rear engine Transit bus. ESN [...]. Has fault code 4156. The doser heater relay supply wires only have 8-10 volts to it. Cummins wire diagram shows the doser heater relay and the line heaters relay fee...
Kubota RTV900 fuel pressure
03/13/2019 in the HD/Fleet Forum
Any Kubota people out there? I have this RTV900 with a D902 3 cylinder diesel engine in it. Was brought in not running. Had not been serviced for a long time. We serviced all filters, etc. Fuel filter was clogged. Got running, delivered and customer calle...
F650 Cat C7 Fuel code defination
03/12/2019 in the HD/Fleet Forum
Working on a friends 07F650 with a c7 cat getting code 1348-5 engine fuel pump pressurizing assembly current below normal. I don't normally work on MD trucks and don't have any info on this code. We already changed all filters and it seems to run perfect....
cutting out under heavy load
03/12/2019 in the HD/Fleet Forum
[Driveability: 06 International 4300 7.6L] Intermittently this truck will cut out like its loosing fuel. I replaced the fuel filter and screen, fuel pressure is at 50 psi out of the filter housing. It will run fine for weeks or months then cut out going ...

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