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Re 280 107 SL. How long should it take for the engine to return to idle from cold start. ? I run an 82% thermostat and water temp in cyl. head is up to 82% in 1 to 2 ks depending on the weather. But the idle is still to high till 5 or 6 ks. The auxilary air valve is buried under the manifold...

At last I've found a mercedes forum which addresses the questions asked ! Newly aquired '81 280 S L a good car. Air ,leather, etc. ,4 speed auto. Problem is the petrol tank won't accept the last 15 lts. unless I dribble it in. Tank was removed and opened, looks like new inside. The breather...