JanakaDissanayake

Hi Rumesh88, I thought the same at first too. Replaced the vacuum switch (it had a problem of not cutting out vacuum once I turn off the AC, too) and replaced all the hoses with new ones. Still the problem is there. I think the diaphragm inside the unit is leaking, hence the arm is not pulled all the way inside to pull the throttle to the required position. If I keep on advancing the engine from the carburetor, at a certain point the pull is enough to compensate the AC compressor load and the problem disappears. (then again the engine is too advanced when the A/C turns off)

Hi Ruslan, Amayama doesn't have BF3P listed in their webpage. eBay doesn't have the exact part, but has Vacuum Advance Diaphragms that can be used generally. I could also find compatible parts in Sri Lanka, but then again I would have to mod the existing mechanism to fix them.

Hi, I recently bought a 1986 Mazda Familia 323 (BF3P) 2 Door Hatchback edition. I noticed that the engine is going retard as soon as I switched on the Air Conditioning. Later I found out that there's an Vacuum Advance Diaphragm connected to the Carburetor to mechanically pull the throttle when the Air Con is turned on and this device is not pulling the throttle enough to compensate for the AC compressor load. I wasted almost a week looking for a replacement part in Delkanda & Panchikawatte but failed to find the exact part. I would be delighted if someone can point me to a place where I can buy it. This is the culprit that makes me loose my cool! http://1drv.ms/1n1rWNe Thanking you in advance, Janaka.