I have a 1990 560SEL that has an issue with stalling at idle. It only happens when the engine bay is up to operating temp and the car is restarted after a short stop. It starts and then within seconds dies. A little cranking gets her running again and no problems follow on the road.

Could this be the idle air valve sticking? The last time this happened, I pressed the pedal down 1/2 way to bypass the idle air valve and cranked, but still took a few seconds to start so I'm wondering if it is fuel related instead.

It has a somewhat rough idle with 250k on the clock (power balance test showed one or two cylinders a little low), but all maintenance has been done including timing chain/tensioners/guides/cam sprockets, except valve job. Runs about 80-90C.

Thanks,

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Dave

2002 Audi S6 Avant
1983 300D
1984 300D (sold)
1990 560SEL (sold)