Carby Flat Spot

[Falken_KE30]

just got a little prob, not bad just annoying.

 

engine is

 

4k,

all new gasket, redone head, rebuilt carby (3k, no choke system)

points dizzy ect ect.

Light flywheel, HD clutch

 

Problem is it has a small flat spot as you re apply the throttle, doesn't matter what speed your doing. it seems to be just as put foot on pedal, probably no more then 5-6mm. and if you hold it at that point its very hesitant.

 

Checked the accelerator pump, its working, all stock jets, so I'm sure its fine. mixture seems good, havnt checked timing.

 

Its not a major problem, I'm used to it. but want thoughts on what it is, what i can check ect.

 

Cheers

Dan

[corollaart]

+ 1 accelerator pump or linkage to it.

[B.L.Z.BUB]

Ive got the same problem and have narrowed it down to accelerator pump. Might seem to be working but the seal prob isnt 100% so its not pumping at 100%. Thats what my manual says anyway.

[Falken_KE30]

Yeah thats what i thought,

 

Might see if i can get a new pump and stuff... might have to buy a kit though.

[B.L.Z.BUB]

yeah I need to do the same but I'm poor and lazy :wink:

[coln72]

Dialed this out by playing with the accelerator pump linkage and spring length/stiffness.

[Falken_KE30]

Any tips?

 

Not sure where to start really, if spring harder, whats that do?

length of it do what?

 

Dan

[SLO-030]

Sounds like the bore in which the pump slides is scored near the start of the stroke. Seal stuggles to seal and when it gets past the scored part it works fine.

[coln72]

Any tips?

 

Not sure where to start really, if spring harder, whats that do?

length of it do what?

 

Dan

 

Love to help you but that was close to 18 years ago.......... To many beverages consumed since then :)

 

Think the stiffer spring made the plunger move earlier. Same with making the spring longer, but wiser people will correct me if I am wrong.

[Nitephyre]

Check your timing, that might help... it helped me :)

[B.L.Z.BUB]

I ordered a new accelerator pump today ill let ya know if it fixes the problem, if not.... might be mechanic time.

[madKE35coupe]

have you replaced the spark plugs or points recently? or do you run electronic ignition? i know i used to have the same kinda problem if one was working better than the other.

[coln72]

or you could do a poor mans carby clean. Swap the two middle plug leads around, hold your foot flat and turn the engine over. If there is any crap in the carby the backfiring should move it :) By the way, take your aircleaner off as it may catch fire........

[Falken_KE30]

Doubt its carby dirty, i pulled it down and cleaned it about 5 months ago.

 

Plugs i did same time as points,

 

Will check timing, and mixture later, might also chuck a new thermostat in, car doesnt seem to get hot even on a long trip.