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International Automotive Technicians Network

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 T5 2.0L Cylinder Identification Wrong?
02/03/2026 in the Technical Discussion Forum
[Engine: 16 Volvo XC70 T5 2.0L] Odd occurrence on this vehicle: Came in running poorly with a Misfire on Cylinder #2. Performed the typical diagnostics on it, swapped coil and plug to separate cylinders and miss stayed on 2. At that point, elected to run...
Coolant overflow hose fitting oring
02/02/2026 in the Technical Discussion Forum
[Engine: 12 Ford F-150 FX4 3.5L] The overflow/coolant recovery bottle has a larger hose that is considered a heater hose. It has a [...] plastic fitting that runs back to the heater. There is a clip and what I assume are some seals orings there. Ford doe...
Roller Bearing questions I never hear asked
01/24/2026 in the Technical Discussion Forum
First question: WHY were standard RWD front wheel bearings two different sizes? Seems like they would be the same size. Second question: WHY does the front pinion bearing have more taper? I suspect the steeper taper has an effect on load carrying, but I c...
F150 axles swapped from an F250
01/22/2026 in the Technical Discussion Forum
Has anyone ever replaced front spindles and rear axle from a Ford 3/4 ton truck into a Ford 1/2 ton? I'm with a historic railroad group that has a spent F250 configured for 'high railing' and a functional F150 that they want to have the high railing equip...
Diagnosing Engine Noises
01/19/2026 in the Technical Discussion Forum
Something I've not been super confident on when diagnosing engines is engine noises. This is due to 'lack of practice.' I suppose. I get a lot of sway bar noises. I get a lot of wheel bearing noises. I get a lot of practice on determining what is causing ...

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