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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

99 7.3l international school buss low power stalls
08/17/2018 in the HD/Fleet Forum
[Driveability: 99 International 3000 7.3L] this buss ran out of fuel. now has 3/4 tank good flow to filter. new filter.has new cam sensor. new ecm relay. when starts it smokes white then clears up as gets up to temp. will drive good about a mile then loo...
Oil/Coolant mixing
08/16/2018 in the HD/Fleet Forum
[Driveability: 12 International 4300 6.4L] Techs, I have the above vehicle that has a severely contaminated cooling system,oil/coolant mix that looks like black pudding.The crankcase is also overfull and sludgy.We believe we have a failed oil cooler.The ...
1999 Mack ch613 vmac timing sensor wiring
08/15/2018 in the HD/Fleet Forum
This vehicle came in with low power complaint. Has SID 22 FMI 8 timing sensor ckt. (Don't know of its related or not, but started here. Might help starting anyway as it has a somewhat long crank time.) Found timing sensor unplugged. There are some wires c...
6.0 ipr screen debrie not sure what?
08/15/2018 in the HD/Fleet Forum
[Engine: 06 Ford F650 6.0L] Don't see a lot of 6.0 any more but there still around getting sold. This is a just bought truck was coming in for out of province inspection and never made it. Towed in. We had a no start with no hpop. Installed our test ipr ...
No Jake brake and now no start
08/14/2018 in the HD/Fleet Forum
[Driveability: 98 Mack CH CH600 11.9L] Pulling what little is left of my hair. E7 427 mechanical pump, brought in with a blown head gasket and bent push tubes. #5 intake rocker adjustment locknut had backed off and over pressurized, all fixed (mechanical...

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