second gear lag

[ThomChloe]

hi just wondered if anyone had any idea why my van has a lot of lag when i put foot down in second gear after a second or two its fine and ok in other gears.would appreciate any help thanks.

[CovKid]

Not in 1st??

[ThomChloe]

no only in second gear its ok if im easy on the pedal but when i give it some thats when it happens. i changed the vacuum unit as i read it could be that but no joy

[pionte]

when you say lag... can you explain more ? You dont mean that although the engine revs rise the speed doesnt increase ?? that would be clutch slip .

[ThomChloe]

There is not much power and then it flys like a turbo kicking in

[CovKid]

I just had this and it turned out to be nothing more complex than HT leads breaking up. Perhaps they functioned better when I gave it some more revs, but in any event the leads were the cause. Slightly lumpy idle too though. If your idle speed is fine then you need to look elsewhere, air leaks, accelerator pump, that kind of thing.

[pionte]

yes, I think that you need to check the basics, spark plugs, distributor cap, rotor arm, leads, then fuel filter ( in case of starvation ) remember the one in the carb too... then check for blocked jets, maybe the primary ( then when the accelerator jet kicks in its better ) air filter , then check for air leaks... vacuum pipes, brake servo hose,

just re read your original post, its defo only in second gear ?? not an auto box ? strange.

[ThomChloe]

No only in second I changed the vacuum pump as it was broken and had read on here that would be why it was doing it but still the same . It's fine in the other gears though and if I press the accelerator nice and steady in second it's ok it's only when you put you foot down a bit hard strange really . Thanks for all the replies back to the drawing board then.

[CovKid]

Well it won't be related to the gears specifically, more a problem that occurs at a particular speed and rev range. As said check the above. If its run fine up to now, DO NOT change carb or dizzy settings. It'll be an electrical item breaking down, air leak or fuel blockage. If plugs and leads are old, change them.