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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

Toyota 3.5L Cylinder Head Repair
11/20/2025 in the Technical Discussion Forum
[Engine: 20 Toyota Tacoma TRD Off-Road 3.5L] I've got a pickle. I've got this guy with a 2020 Toyota with a misfire on #1 cylinder. Runs fine going down the road, but steady misfire at idle. Leakdown test verified the #1 cylinder was loosing air by the e...
2015 Lincoln- low fuel pressure
11/18/2025 in the Technical Discussion Forum
[Driveability: 15 Lincoln MKS 3.7L] I have a 2015 Lincoln MKS Base, 3.7L 6Cyl GAS Naturally Aspirated. VIN:[...] It is running lean under all conditions. I discovered the fuel pressure at idle is 30 psi. It has DTCs P0171 & P0174. Fuel pressure specifica...
threads
11/16/2025 in the Technical Discussion Forum
trying to make a puller. which threads hold up better , meaning more force before strippng. fine or corse?
Ford 4.9 (300) spark plug woes
11/14/2025 in the Technical Discussion Forum
[Engine: 86 Ford F-250 XL 4.9L] WOW! Had this carbureted 86 F150 in for freshening up, Pretty solid truck with the 4.9 300 inline engine. I decided to do some spark plugs, looked like they had non foulers on the end, and plugs had been in for along time....
Oil
11/14/2025 in the Technical Discussion Forum
Has anybody heard of or is using "Starfire" oil, is it legit or junk? Salesman was in earlier and we can get the full synthetic significantly cheaper than the Napa bay boxes we currently use.

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