Volvo Owners Club Forum - View Single Post - Engine: 2.1 F/Inj B21E:

140 · Dec 18th, 2022, 13:16

I would also remove sometime the butterfly casing witch the idle screws into and give it a good internal clean as the channels in the casting will slowly carbon up. i would be very surprised if you have to adjust the butterfly stop if it hasn't been moved from new but you may need new gaskets. this will the idle speed.

Dec 18th, 2022, 13:16	#7
140 Junior Member Last Online: Apr 24th, 2024 18:13 Join Date: Feb 2015 Location: Norwich	I would also remove sometime the butterfly casing witch the idle screws into and give it a good internal clean as the channels in the casting will slowly carbon up. i would be very surprised if you have to adjust the butterfly stop if it hasn't been moved from new but you may need new gaskets. this will the idle speed.