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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

Ghost misfires?
11/12/2025 in the Technical Discussion Forum
[Driveability: 02 Honda Accord EX 3.0L] This car came in for a Check Engine light with and egr and evap codes. It had a plugged up manifold causing the EGR code and a Bypass valve for the evap code. We also replaced the battery and cables. When the job w...
2002 silverado 4x4 pulls left in 4x4
11/12/2025 in the Technical Discussion Forum
2002 silverado 5.3, auto, auto 4 button 4x4, ext cab, std bed. In 2wd it drives as it should goes straight no pull on gas or off gas, does not pull braking. Push the 4 hi button and it begins pulling left quite hard on or off the gas. Tires are good- brak...
2003 Dodge 3500 5.9L Cummins
11/10/2025 in the Technical Discussion Forum
Hello, TDF! I have a common problem, a really nice, low-mileage Dodge 3500 RAM with a bad TIPM. The core problem is the right-hand trailer turn signal relay isn't working. The relay is soldered into the printed circuit But the primary problem is that I ca...
battery intake current using low amp probe
11/05/2025 in the Technical Discussion Forum
Hello, IATN members. Recently I have advised several IATN members on the importance of measuring battery intake current when replacing a battery, and or alternator. Several times the battery intake current, five minutes after start up, was too high. Such ...
How to find a Resistive short to ground
11/03/2025 in the Technical Discussion Forum
We have a 13 Ford Fusion with a resistive short to ground on a data line. It is not a module. It is somewhere in the harness. Does anyone make a short locator tool that doesn't require amperage? Resistance changes over time. Sometimes worse, sometimes non...

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