Hyosung GT650R EFI (Daewoo ECU) – Won’t hold idle / Stalling issue

[danielFromPoland]

Bike Model = : GT650R

Hi everyone,

My name is Daniel and I’m writing from Poland. I recently got my hands on a fuel-injected Hyosung GT650R with the Daewoo ECU, and I’m dealing with a really frustrating idle issue.

Basically, the bike won’t hold its idle. About 90% of the time, I have to give it some throttle just to get it started, and the moment I let off the throttle, the engine dies. The weirdest part is that once in a blue moon, it will start up and idle perfectly fine as if nothing is wrong.

Here is what I have already checked and ruled out:

• TPS: Adjusted and set correctly to 1.12V.

• Vacuum leaks: Checked thoroughly, it’s not sucking in any unmetered air.

• ISC Valve: The idle speed control stepper motor is working.

Has anyone experienced something similar with these Daewoo ECU models? I feel like I’ve checked the obvious things, but I’m completely stuck. Any advice on what I should look at next would be greatly appreciated!

[Author]

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