Something missing from carb, what is it?

Need technical Q/A then you're in the right place

Moderator: martauto

Junglistjed
E30 Zone Regular
E30 Zone Regular
Posts: 472
Joined: Sat Jul 13, 2013 11:00 pm

Post Tue Nov 26, 2013 9:49 pm

My local told me there was something missing on the m10 carb to do with acceleration idle control, he wasn't sure what is was called but it was causing the cutting out when the foot came off of the accelerator.. he described it as a plunger that cushions the difference between gas and no gas.

any ideas?
capnmchl
E30 Zone Camper
E30 Zone Camper
Posts: 1141
Joined: Mon Feb 20, 2012 11:00 pm
Location: Exeter, Devon

Post Wed Nov 27, 2013 12:21 am

Accelerator pump? But they're used the other way round. You also have progression holes to smooth out closed throttle to open.

Not sure if the pierburgs have accelerator pumps though.

Could be on about an idle air control valve. On fuel injected cars, the idle air control valve tends to open momentarily as the revs near idle from the throttle closing.
Junglistjed
E30 Zone Regular
E30 Zone Regular
Posts: 472
Joined: Sat Jul 13, 2013 11:00 pm

Post Wed Nov 27, 2013 12:56 am

He thinks that the difference from revs to no revs is too much and causes the car to cut out, and the part that drops the revs dropping so heavily is missing or something?