dj_efk
Well-Known Member
Hi all,
When the throttle of my 2800CS is pressed even a little I get a cough before any acceleration. This happens whether I press the throttle a moderate amount or if I ram it into the carpet!
I have gone right through the engine with new consumables and NGK plugs and the timing is correct (with the Lumenition Optronic setup installed), the valve clearances are a little noisy but have been adjusted as best as possible given the wear in the valvetrain, I've tried spraying carb cleaner into both carbs for a minute each at 3000rpm or thereabouts. The advance / retard mechanism is working fine so I'm now discounting the ignition side of things.
The car is returning poor economy mileage too at under 20 miles per imperial gallon - I was thinking the carbs need a strip and rebuild but I'm wary of doing this as I've heard they're difficult - Is this right? (not sure but think they're Zeniths - It's an early 1969 car). I've also replaced the the standard air filter elements with K&N's inside the original housing so as not to alter the mixture, could this be the problem? I was thinking it couldn't be. I've also always run it with an in-line fuel filter but I suppose it's possible that something could have got past this or perhaps stale petrol could have "varnished" the internals of the carbs (the car was a resto project off the road for a few years until fairly recently).
Ideas and advice much appreciated!
When the throttle of my 2800CS is pressed even a little I get a cough before any acceleration. This happens whether I press the throttle a moderate amount or if I ram it into the carpet!
I have gone right through the engine with new consumables and NGK plugs and the timing is correct (with the Lumenition Optronic setup installed), the valve clearances are a little noisy but have been adjusted as best as possible given the wear in the valvetrain, I've tried spraying carb cleaner into both carbs for a minute each at 3000rpm or thereabouts. The advance / retard mechanism is working fine so I'm now discounting the ignition side of things.
The car is returning poor economy mileage too at under 20 miles per imperial gallon - I was thinking the carbs need a strip and rebuild but I'm wary of doing this as I've heard they're difficult - Is this right? (not sure but think they're Zeniths - It's an early 1969 car). I've also replaced the the standard air filter elements with K&N's inside the original housing so as not to alter the mixture, could this be the problem? I was thinking it couldn't be. I've also always run it with an in-line fuel filter but I suppose it's possible that something could have got past this or perhaps stale petrol could have "varnished" the internals of the carbs (the car was a resto project off the road for a few years until fairly recently).
Ideas and advice much appreciated!
