Lumpy idle. Petrol in air box

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Lumpy idle. Petrol in air box

140/164 Series General Forum for the Volvo 140 and 164 cars

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May 17th, 2021, 15:47	#1
TonyCy Junior Member Last Online: Nov 29th, 2021 10:02 Join Date: Feb 2021 Location: Limassol	Lumpy idle. Petrol in air box Gd eve. V164 twin stromberg. Lumpy idle and plugs give indication of running too rich. Valve clearances good, timing spot on. I’ve tried adjusting the trim screw and whilst I can see a slight improvement on my colour tune it is still rich. Dropped off air box cover and found fresh petrol in air box which I think is originating from the front carb. My first though is leaking needle valve or an issue with float height and the slight vacuum in the air box is drawing fuel from carb somehow. It would account for the rich running at least. Does this sound about right or anyone else an idea what to check that might result in raw fuel in air box ? I’m asking before I whip the carb off tomorrow. Cheers.

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