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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

6.5 GM diesel 12 volt glow plug convertion
07/19/2018 in the HD/Fleet Forum
I want to put 12 volt glow plugs in this truck with a manual button to control the relay. The customer put a new set of delco 60G plugs in it, and they burst in about a week. I have converted many older diesels from quick start to manual systems, but all ...
International Engines- MAN?
07/18/2018 in the HD/Fleet Forum
This is interesting. Apparently things are still ugly at Navistar, and they are continuing to move away from their own production.
Onan 4KY and owner
07/17/2018 in the HD/Fleet Forum
A couple weeks ago I had a 5th wheel come in that the gen set wouldn't stay running. It would fire up, run a few seconds and shut down. I played with it a little and tried cleaning the problematic carburetor which is used on these. Thanks to the EPA you a...
No communication with ABS
07/17/2018 in the HD/Fleet Forum
[Brakes: 16 Freightliner M2 106 6.7L] Bus has 237,000 miles on it, hydraulic brakes. ABS light is on. Using Meritor Tool box through JPro, we have no communication. All software is updated. Ran through all of the pin tests as per Wabco and everything is ...
CAT C7 rough start
07/15/2018 in the HD/Fleet Forum
ESN [...] 2007 Thomas school bus. Complaint is rough noisy start on first start of day. Clears up after 3 to 5 minutes and is good rest of day. Hooked up w CAT ET. Have 2 logged codes 94-1 Low Fuel Pressure Warning and 94-11 Low Cranking Fuel Pressue. Log...

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