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GS460 Won't idle when hot

Meggsie
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Meggsie Member

Meggsie

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2010 GS460 - been an excellent vehicle, now at 180,000km.  Following repair of leaking coolant valley, several similar problems have occurred (maybe a coincidence). End result is that the engine will not idle when hot.  Cold starts OK but once warm and revs drop to normal idle, the engine stalls.  Will restart and run with throttle but as soon as allowed to idle, engine again stalls.  Nothing gets recorded on the fault computer.  Been in the dealer's service centre for all of December 2023 but to date they are unable to rectify.  Anyone any ideas ?

(Very similar set of problems recorded by 'Christian' from Germany on the clublexus.com forum but I'm unable to determine if he ever got a solution.)

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