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Old 08-01-2011, 06:05 AM   #7578
Lion BR
I'd rather be riding
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Joined: Oct 2005
Location: Oregon
Oddometer: 4,261
Thank you, I appreciate the clarification. Can we say, then, that according to that poster the problem solution involves a software (ECU tune) and a hardware (stepper motor) correction? And what is the actuator?

Originally Posted by The Jerk View Post
Ok you've got some bad info in here so I just want to clarify a couple things so the issue does not become even more confused.

A stepper motor is simply an electric motor that is configured to make very fine movements.

You are confusing ignition timing and valve timing which are two wholly different concepts. No motors or moving parts are used to adjust ignition timing (these days). The ignition timing is part of the ECU tune and is adjusted electronically via the ECU according to the map.

Valve timing is static and is set by the engine designers when the camshafts are designed and manufactured. Triumphs do not have variable valve timing.

The stepper motor in Triumph's case is a small electric motor (or motors - I can't recall if there's just one or if there's one for each throttle body) whose job it is to make fine adjustments to throttle angle to maintain a stable idle at the target idle speed as programmed within the ECU map. The ECU map provides for a target idle speed which is based upon coolant temperature.

I'll be interested to see how this angle plays out.
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