Tor
Well-Known Member
My father's South African 1973 V8 auto runs HIF6s and has a throttle hesitation issue that we've struggled to figure out. So far, it can only be compensated for by enrichening the mixture on the one side to the point where the car returns 10mpg urban.
With proper synchronisation and balancing the MPG and general response have improved a lot, but the minute you stop the engine and restart, as one does when shopping, it's a complete pig to drive. Putting foot helps, but it takes a good second or two to bite from standstill (and there's no power until it does). The LHS carburetter is the offender, and RPM wavers while accelerating until it reaches peak running temp. While warming up the engine needs a lot of choke.
It gets worse in right-handers, as power comes and goes in a steady, frustrating rhythm.
It's getting a replacement set of carbs fitted but this sort of issue makes one curious. Fuel line filters have been replaced and the car is generally well looked after by a P6 expert. Electric fuel pump. Carb spindles have lengthwise play (along the axle) but very little "up-and-down" play.
With proper synchronisation and balancing the MPG and general response have improved a lot, but the minute you stop the engine and restart, as one does when shopping, it's a complete pig to drive. Putting foot helps, but it takes a good second or two to bite from standstill (and there's no power until it does). The LHS carburetter is the offender, and RPM wavers while accelerating until it reaches peak running temp. While warming up the engine needs a lot of choke.
It gets worse in right-handers, as power comes and goes in a steady, frustrating rhythm.
It's getting a replacement set of carbs fitted but this sort of issue makes one curious. Fuel line filters have been replaced and the car is generally well looked after by a P6 expert. Electric fuel pump. Carb spindles have lengthwise play (along the axle) but very little "up-and-down" play.