Recently started having this problem with my Bay 1600cc. It is very hesitant at low revs, and even if I put my foot down or pump the throttle a bit too get some fuel in there, it still takes a little while to pick up. Once the revs pick up it pulls strongly. It needed a service anyway so I have given it the works : spark plugs, leads, dissy cap, rotor arm, fuel filter, air filter, oil change, timing. I have not yet done the valve clearances or points and condenser, that will be on the weekend. Do you think this problem could be something to do with the carb? or something like a manifold air leak perhaps? Like I said, if i put my foot down to give it a squirt of fuel, it still does not pick straight up.
Recently started having this problem with my Bay 1600cc. It is very
hesitant at low revs, and even if I put my foot down or pump the throttle a
bit too get some fuel in there, it still takes a little while to pick up.
Once the revs pick up it pulls strongly. It needed a service anyway so I
have given it the works : spark plugs, leads, dissy cap, rotor arm, fuel
filter, air filter, oil change, timing. I have not yet done the valve
clearances or points and condenser, that will be on the weekend.
Do you think this problem could be something to do with the carb? or
something like a manifold air leak perhaps?
Like I said, if i put my foot down to give it a squirt of fuel, it still
does not pick straight up.
Two major items:
carb accelerator pump jet. Hard to check on a '72 since you can't look down the carb throat. Might have to remove the carb.
manifold heat. The smaller pipe under the manifold. After a 10 minute run, feel both ends of the small pipe. Both ends should be hot enough to burn your fingers. If only one end is hot, the heat is not working and will cause major stumbling problems.
Timing, spark and vac leaks are also possible causes but my money is on the first two.
"I have no use for a car which has more spark plugs than a cow has teats!" Henry Ford, when advised that Chevrolet was introducing a 6-cylinder engine.
Gareth Edwards 22 March 2007 01:51:10 [ permanent link ]
"Harry Smith" <ev1lbastard@yahoo.com> wrote in message news:1174453560.233032.63730@y80g2000hsf.googlegroups.com...
On Mar 20, 1:33 pm, "gareth edwards"
<gareth.edwards...@btinternet.com> wrote:
Recently started having this problem with my Bay 1600cc. It is very
hesitant at low revs, and even if I put my foot down or pump the throttle
a
bit too get some fuel in there, it still takes a little while to pick up.
Once the revs pick up it pulls strongly. It needed a service anyway so I
have given it the works : spark plugs, leads, dissy cap, rotor arm, fuel
filter, air filter, oil change, timing. I have not yet done the valve
clearances or points and condenser, that will be on the weekend.
Do you think this problem could be something to do with the carb? or
something like a manifold air leak perhaps?
Like I said, if i put my foot down to give it a squirt of fuel, it still
does not pick straight up.
You never mention what kind of distributor or carburator you have...if
it's a 009 and 34 Pict 3, that's you're problem right there. Forgive
me if I'm way off base here.
By the way, how's that 1600cc do in a bay window? I'm in the process
of swapping a type IV into my Beetle and its 1600 into my friend's bay
window.
Peace,
Harry
It is an 009, not sure of the carb, though I do believe it is the original. I have not long had it and I am used to Beetles with 1776 motors and Dellorto carbs But it never used to be hesitant, it used to drive really well. I was quite surprised how nicely it pulls the big old bus around.
"I have no use for a car which has more spark plugs than a cow has
teats!"
Henry Ford, when advised that Chevrolet was introducing a 6-cylinder
engine.
Cheers Speedy
Do you think it could be the pump jet? As if the engine is revving at say
over 3000rpm, and I floor the throttle it picks up straight away so it
*seems* like it is working, it is only at low revs there is the problem.
I did not think of the heat issue, it has certainly been cold here lately
in sunny South Wales! Will check this as soon as I can.
Timing is spot on, and pretty sure spark is good. Will let you know what
I find.
Thanks Jim
Have not had chance to give it a good run out and check the heat risers on the manifold yet, but I pulled the carb off and checked out the accelerator pump and this is working fine, a nice squirt of fuel coming out of it every time.
One other question, I adjusted the valve clearances today by setting the pulley to what I thought was the TDC mark, but now I am thinking that it may be the 5 degrees atdc mark. Will this make much difference to my valve clearances?
"I have no use for a car which has more spark plugs than a cow has
teats!"
Henry Ford, when advised that Chevrolet was introducing a 6-cylinder
engine.
Cheers Speedy
Do you think it could be the pump jet? As if the engine is revving at
say over 3000rpm, and I floor the throttle it picks up straight away so
it *seems* like it is working, it is only at low revs there is the
problem.
I did not think of the heat issue, it has certainly been cold here
lately in sunny South Wales! Will check this as soon as I can.
Timing is spot on, and pretty sure spark is good. Will let you know
what I find.
Thanks Jim
Have not had chance to give it a good run out and check the heat risers
on the manifold yet, but I pulled the carb off and checked out the
accelerator pump and this is working fine, a nice squirt of fuel coming
out of it every time.
One other question, I adjusted the valve clearances today by setting the
pulley to what I thought was the TDC mark, but now I am thinking that it
may be the 5 degrees atdc mark. Will this make much difference to my
valve clearances?
The cam lobe is quite broad at that point, so being off a few
degrees doesn't really matter.
Jim
Great, I didn't fancy doing them again. On cylinders 3 and 4 all the
valves were very loose, about 10 or 12 thou! This was not helping the way
the bus was driving either. I will hopefully get a chance to take it out
tomorrow, and then I can see how it goes and then also check the heat
risers.
Thanks again Jim
Checked the manifold heat today and the left hand side was very hot, the right hand side not so hot. Just warm really. So this is causing my manifold to ice up? After adjusting the valves the other day the bus is driving slightly better, but how much of a hesitation will the 009 dissy cause? Will replacing it with a vac advance dissy really make that much difference?
Could not see any obvious manifold leaks. I sprayed some wd40 on the rubber boots and could not spot anything bubbling away there.
"I have no use for a car which has more spark plugs than a cow has
teats!"
Henry Ford, when advised that Chevrolet was introducing a 6-cylinder
engine.
Cheers Speedy
Do you think it could be the pump jet? As if the engine is revving at
say over 3000rpm, and I floor the throttle it picks up straight away
so it *seems* like it is working, it is only at low revs there is the
problem.
I did not think of the heat issue, it has certainly been cold here
lately in sunny South Wales! Will check this as soon as I can.
Timing is spot on, and pretty sure spark is good. Will let you know
what I find.
Thanks Jim
Have not had chance to give it a good run out and check the heat risers
on the manifold yet, but I pulled the carb off and checked out the
accelerator pump and this is working fine, a nice squirt of fuel coming
out of it every time.
One other question, I adjusted the valve clearances today by setting
the pulley to what I thought was the TDC mark, but now I am thinking
that it may be the 5 degrees atdc mark. Will this make much difference
to my valve clearances?
The cam lobe is quite broad at that point, so being off a few
degrees doesn't really matter.
Jim
Great, I didn't fancy doing them again. On cylinders 3 and 4 all the
valves were very loose, about 10 or 12 thou! This was not helping the
way the bus was driving either. I will hopefully get a chance to take it
out tomorrow, and then I can see how it goes and then also check the heat
risers.
Thanks again Jim
Checked the manifold heat today and the left hand side was very hot, the
right hand side not so hot. Just warm really. So this is causing my
manifold to ice up?
After adjusting the valves the other day the bus is driving slightly
better, but how much of a hesitation will the 009 dissy cause?
Will replacing it with a vac advance dissy really make that much
difference?
Could not see any obvious manifold leaks. I sprayed some wd40 on the
rubber boots and could not spot anything bubbling away there.
If one side is warm, it's probably working a little bit.
The heat is not there to control carb icing; that's another issue.
With an 009, you have to accelerate "gradually". That's key.
Jim
I had noticed that. It does pick up quicker if I try to ease the throttle down gently rather than flooring it. What is the heat there for then? I always thought it was to stop the carb icing.
"I have no use for a car which has more spark plugs than a cow has
teats!"
Henry Ford, when advised that Chevrolet was introducing a 6-cylinder
engine.
Cheers Speedy
Do you think it could be the pump jet? As if the engine is revving at
say over 3000rpm, and I floor the throttle it picks up straight away
so it *seems* like it is working, it is only at low revs there is the
problem.
I did not think of the heat issue, it has certainly been cold here
lately in sunny South Wales! Will check this as soon as I can.
Timing is spot on, and pretty sure spark is good. Will let you know
what I find.
Thanks Jim
Have not had chance to give it a good run out and check the heat risers
on the manifold yet, but I pulled the carb off and checked out the
accelerator pump and this is working fine, a nice squirt of fuel coming
out of it every time.
One other question, I adjusted the valve clearances today by setting
the pulley to what I thought was the TDC mark, but now I am thinking
that it may be the 5 degrees atdc mark. Will this make much difference
to my valve clearances?
The cam lobe is quite broad at that point, so being off a few
degrees doesn't really matter.
Jim
Great, I didn't fancy doing them again. On cylinders 3 and 4 all the
valves were very loose, about 10 or 12 thou! This was not helping the
way the bus was driving either. I will hopefully get a chance to take it
out tomorrow, and then I can see how it goes and then also check the heat
risers.
Thanks again Jim
Checked the manifold heat today and the left hand side was very hot, the
right hand side not so hot. Just warm really. So this is causing my
manifold to ice up?
After adjusting the valves the other day the bus is driving slightly
better, but how much of a hesitation will the 009 dissy cause?
Will replacing it with a vac advance dissy really make that much
difference?
Could not see any obvious manifold leaks. I sprayed some wd40 on the
rubber boots and could not spot anything bubbling away there.
If one side is warm, it's probably working a little bit.
The heat is not there to control carb icing; that's another issue.
With an 009, you have to accelerate "gradually". That's key.
Jim
I had noticed that. It does pick up quicker if I try to ease the throttle
down gently rather than flooring it.
What is the heat there for then? I always thought it was to stop the carb
icing.
The heated *air* introduced into the air cleaner is there to control icing. The heated manifold is to produce a "hot spot" in the manifold to vaporize raw fuel dumped in by the accel jet.
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