Low mileage

[AhmedLach]

Hi

I have a toyota corolla AE92 4AF, 1992 carb model. Used to get around 600-700 km on a tank. This dropped to around 300 km on a tank, after which i suspected the carb needed rebuilding. Had the carb rebuild but only getting around 400 km on a tank. What else could be the problem?

Also, the cam belt snapped a few months ago. Replaced it and set timing according to the note on the inside of the bonnet, which says the timing must be set to 10 degress BTDC, with the hoses DISCONNECTED. I have read elsewhere that the timing must be at 13 without disconnecting hoses, or 5 degress with hoses disconnected?? Is this true? Is the note in the engine a mistake?

Car starts first time, smooth idle. However, if i play with the accelerator at idle, some black smoke comes out sometimes. The car also will not go past 150kph, or past 4000RPM in 3rd, 4th, and 5th. Used to get down to 180 easily before.

Thanks
Newbie