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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

AC compressor ground location
06/20/2018 in the HD/Fleet Forum
[HVAC: 16 Ford F750 6.7L] Have 12v to AC Compressor. Add external ground and Compressor comes on. Notice the pressure switch is a 3 wire. Need to know if PCM supplies ground or external. Thanks A wiring diagram would be helpful , thanks in [...].
WSS-M2C171-F1 vs API CK-4
06/14/2018 in the HD/Fleet Forum
Let's separate the fact from fiction: The relatively new API CK-4 diesel oil approval has been controversial. Ford experienced excessive engine wear when SOME CK-4 products were used in fired engine wear tests. The increased wear was on rocker arm fulcrum...
Rough Idle, Surging
06/13/2018 in the HD/Fleet Forum
[Driveability: 05 GMC C4500 Topkick C4U042 8.1L] Radom missfires through cylinders, runs fine when revving up, starts surging when slightly warm and idling, new throttle body, MAF, spark plugs & wires and 1 coil any route take?
fuel pressure spec
06/12/2018 in the HD/Fleet Forum
[Driveability: 05 Ford F650 6.0L] 2005 ford f650 6.0 what is fuel pressure suppose to be at fuel filter housing.
07 GMC 3500 Duramax fuel pump location?
06/12/2018 in the HD/Fleet Forum
[Driveability: 08 GMC Sierra 3500 HD WT 6.6L] LMM 6.6L. Stalled on road. Towed in. No fuel pressure at Fuel Filter. The fuel pump never gets energized by the PCM. I have ground and battery power to the Fuel Pump Relay. If I bypass the relay, still no fue...

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