× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

Automotive Technical Theory Forum

Professional automotive forum for discussion of the theory of operation for any automotive system or component. Discussions include electrical and electronic theory, engine propulsion theory, fuel system theory, ignition systems theory, and much more. This forum is for experienced automotive repair professionals only, membership required.

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

Recent Automotive Discussions in the Automotive Technical Theory Forum

Wiring kelvin clips power supply enhanced ohm meter
03/09/2023 in the Technical Theory Forum
Hello, IATN members. This is for Dan H and any interested members. When the constant current is set to 1 amp across resistance to be measured, then your volt (milli-volt reading) is the actual resistance. When 10 amps constant current is used (preferred i...
Inj Pulse Width Cyl X (Us)
02/15/2023 in the Technical Theory Forum
[Driveability: 12 Chrysler Town & Country Touring 3.6L] This van was setting a #4 cylinder misfire with a slightly rough idle. I was looking at PIDs and noticed that the #4 injector pulse width was significantly less than the other cylinders. I was graph...
02/10/2023 in the Technical Theory Forum
[Driveability: 13 Hyundai Elantra GL 1.8L] exhaust cam correlation goes -135 [should be -112] backs down to -112 after 45 seconds of running poorly on cold start up. thought it was dowel pin problem but that does not make sense. chain slack and tensioner...
Fuel efficency
02/10/2023 in the Technical Theory Forum
I recently drove a customer's 1997 Lincoln Towncar executive with a 4.6L engine about 100 miles. It was mostly highway driving at 65 mph. The outside temp was about zero, and the car got 27 miles per gallon. The customer says they have gotten 30 miles per...
Injection issue that didn't make sense
01/21/2023 in the Technical Theory Forum
[Driveability: 18 Nissan NV2500 S 5.6L] Vehicle repaired so not a tech help but more of a "what can I do to prevent this from happening again" question. Had a NV van come in with an P0205 cylinder 5 injector DTC and a strong consistent miss. Tech replace...

Automotive Sponsored Discussion Forums