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Automotive Technical Discussion Forum

Professional automotive forum for all types of vehicle repair discussion that does not fit into one of our more specific technical forums. Discussions include both OBD and OBD2, engine performance analysis, diagnostic best practices, service information, vehicle standards such as J1962, J1939, J2534, OBD2 modes (e.g. MODE$06), ignition and fuel system analysis, alternative propulsion (e.g. hybrid, electric, natural gas), and more. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the Technical Theory Forum.

Recent Automotive Discussions in the Automotive Technical Discussion Forum

2016 Volvo XC70 PCV valve
08/08/2026 in the Technical Discussion Forum
2016 volvo xc70 2.5 5 cyl turbo. I have huge vacuum in the engine if you remove the oil cap it feels like the vacuum you have at the throttle body. If I remove the hose that connects the oil separator to the valve cover the hose feels like a pcv valve hos...
2018 GMC Sierra Windshield Washer Fuse Blowing
08/06/2026 in the Technical Discussion Forum
[Electrical: 18 GMC Sierra 2500 HD SLT 6.6L] Customer brings in a 2018 GMC and the fuse blows immediately anytime he uses the windshield washers. He does a lot of camping in it and wants the washers to work. He told me he thought the washer pump was froz...
Testing DIG Fuel Injectors
08/03/2026 in the Technical Discussion Forum
Often concerns such as multi-cylinder misfires, some lean/rich conditions, fuel ration imbalance concerns after all other components are verified as good, the next step is to replace fuel injectors often in DIG systems but no real way to test them unless ...
John deere 6068 getting coolant out the crankca vent
08/03/2026 in the Technical Discussion Forum
I'm asking for a friend. I haven't seen this loader. He said it's losing coolant and he has been unable find where it is going. Has to add about a gallon of coolant approximately every 80 hours. He has an 12oz catch can under the crankcase vent pipe from ...
1998 Chevy Malibu a/c pressure switch help
08/02/2026 in the Technical Discussion Forum
Got a a/c system in my sons car . Freon is showing 80 psi on both gauges with a/c not operating .It uses a three wire pressure switch . One wire top left has 5.2 volts ,other wire top right is show 1896 ohms to ground and last bottom is showing 0 . What i...

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