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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

Ignition system
12/11/2018 in the Technical Theory Forum
I appreciate your help about documentation related to: 1) 2 spark plugs per cylinder like in some Hondas 4 cyl with 8 spak plugs and 8 coils. 2) Ignition systems with 2 or 3 firing events in each ignition cycle. Thank in advance.
NVH mg measurement
12/10/2018 in the Technical Theory Forum
In general terms how many mg when measuring amplitude would be a concern when measuring tire, engine or propshaft vibration with an accelerometer? 10, 20, 30 mg?
How Does The PCM Determine Misfie?
12/08/2018 in the Technical Theory Forum
I had an 03 Silverado in the shop with 3 bad injectors. The scan tool showed cylinders 5 & 6 misfiring but never showed cylinder 2. All three were completely dead fuel injectors. The truck is repaired and runs great with the 3 new injectors but I am ...
Burnt Out Distributor Electrode
12/06/2018 in the Technical Theory Forum
Had a 1992 Toyota pickup, 2.4 engine, 302,000 miles in the shop and found something I\'m trying to understand. Truck had a new engine put in maybe 10,000 miles ago and they put the main battery ground on the frame side of the motor mount rather than...
False Ford P0204?
12/03/2018 in the Technical Theory Forum
Greetings IATN, We have a 2010 Mercury Mariner in the shop that came in with a P0304 and an intermittent miss on cylinder 4. Assuming 60 miles of post-repair test driving is enough (and per the customer's experiencing of the symptom's intermittent nature,...

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