Not sure if I've asked this here before.... At low speeds my bus kind of chugs ( feels a little bouncy) until I plant the accelerator down, then it smooths out. It's not a massive issue, I was just wondering if this is normal or should I be looking at something?
Ok probably just timing a bit off as said above. If my fuel pump was not delivering enough pressure would this cause that symptom? Idles fine and pulls well enough when foot down. Imagine going around a roundabout or junction in second gear just feathering the accelerator, that's when it will chug, put foot down harder on accelerator....goes away.
Unlikely to be fuel pump then I'd think, as it would probably struggle more the more fuel you called for? I'm no expert though. Could be carb jetting or timing I guess. I'd start by servicing it. Definitely not normal though; there's no reason your bus should run any different to a "normal" car.
Timing not advancing in dissy? Chugging and bogging down isn't normal - the engine should pick up smoothly.
Taking in air where it shouldn't. I once had this and zed mentioned checking the exhaust for leaks after I had checked everything else for leaks. He was bang on. I changed the exhaust from a four into one empi to a standard and bingo it was gone.
in second gear, on the flat, feathering the throttle, your engine is under very little load and will still be operating on the idle circuit (s) unless it's FI...if you have a vac/mech dizzy, check to see if there are any cracks or splits in the hose.....similarly, if the carb has any other vac hoses, check to see these are either plugged or properly routed...it sounds ignition advance related (give that you say it idles fine and pull well enough under greater load... as usual, start by checking valve clearances before checking the timing....while you're at it, check the vac advance is actually working if fitted Lastly, it could be that your air/fuel mixture is out...this often happens when folk set it without the engine fully warmed up and/or the throttle plate is more open than it should be to account for mis timing, due to incorrect valve clearances.....(you get the drift) fuel starvation would be much more noticeable under hard accelleration or going round corners...what happens is, the engine's demand increases, but there's insufficient fuel mixed in with the charge so it goes lean, or the fuel in the bowl sloshes to one side exposing the jet to air, rather than fuel...either way, the engine dies untill it's had a chance to recover
