I have a minor hesitation right at the very start of the accelerator - after that there is no hiccups.
Just wondering what causes this?
When I say hesitation; you open up the throttle and the engine does not pickup revs (as though it's cold), if you leave your foot where it is, quarter of a second later it picks up revs and takes off.
It only seems to be when you depress the accelerator (any amount) from a throttle that has been completely closed for a second or two that it does it.
Wondering if this is poor carby adjustment on my behalf or the signs of a needle beginning to stick and needing replacement? Or my timing still out?
Not so much of a problem as it is a curiosity.
Flatspots/Hesitation
Started by
_Loki_
, Jul 24 2006 07:17 PM
9 replies to this topic
#2
rodomo
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Posted 24 July 2006 - 07:27 PM
Check the float levels. Where is the timing set?
#3
tinkers
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Posted 24 July 2006 - 07:49 PM
Sounds like what mine was doing.
I had a new Accelerator pump conversion kit put through it.
accelerator pump cam was changed from yellow to white umm or the other way around. I think there is currently the white one.
I had a new Accelerator pump conversion kit put through it.
accelerator pump cam was changed from yellow to white umm or the other way around. I think there is currently the white one.
#4
_1QUICK LJ_
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Posted 24 July 2006 - 08:02 PM
it will be the accelerator pump circut.
#5
_1QUICK LJ_
_1QUICK LJ_
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Posted 24 July 2006 - 08:04 PM
just make sure the timings right first.
#6
Tiny
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Posted 24 July 2006 - 08:57 PM
1 quick and tinkers has hit it on the head...
if you want to cheat.. you can put a little more tension on the acelerator pump activating arm... that'll make it come ona bit earlier.. to cover the flat spot.
the best way is to change the cam and make sure that the pump gasket isnt leaking
Cheers
if you want to cheat.. you can put a little more tension on the acelerator pump activating arm... that'll make it come ona bit earlier.. to cover the flat spot.
the best way is to change the cam and make sure that the pump gasket isnt leaking
Cheers
#7
_Loki_
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Posted 24 July 2006 - 10:45 PM
Tiny: Where would I check that exactly? Is this the typical problem carbies have and you see them leaking a bit of fuel onto the manifold?
If so, I don't appear to have any fuel leaks that lead externally of the carby.
More importantly, is it something I should be concerned about that will only severely and damage the carby completely? At the moment it's only a really small split second thing..
Ah my other question is, I seem to have an oil leak at the base of the distributor, a seal to the block of some sort where the distributor base sits in, not entirely sure how bad it is (the dipstick still reads nearly a 1/4 over full and it's still a decent golden colour at the moment). Is this a really bad sign or is it simply a perishing seal?
From what I understand there would be cogs etc. turning directly under there related to the distributor that would require lubrication/oil.
Looks like it'll be an absolute prick to get to it either way :<
Cheers guys, the thing really is running very nicely aside from these minor things, extractors don't tap the swaybar sitting in drive at the lights or taking off anymore since the engine is running alot smoother, more powerful and economy seems to have gone up a bit.
If so, I don't appear to have any fuel leaks that lead externally of the carby.
More importantly, is it something I should be concerned about that will only severely and damage the carby completely? At the moment it's only a really small split second thing..
Ah my other question is, I seem to have an oil leak at the base of the distributor, a seal to the block of some sort where the distributor base sits in, not entirely sure how bad it is (the dipstick still reads nearly a 1/4 over full and it's still a decent golden colour at the moment). Is this a really bad sign or is it simply a perishing seal?
From what I understand there would be cogs etc. turning directly under there related to the distributor that would require lubrication/oil.
Looks like it'll be an absolute prick to get to it either way :<
Cheers guys, the thing really is running very nicely aside from these minor things, extractors don't tap the swaybar sitting in drive at the lights or taking off anymore since the engine is running alot smoother, more powerful and economy seems to have gone up a bit.
#8
rodomo
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Posted 24 July 2006 - 11:57 PM
If your dizzy is loose it would have retarded itself hence your hesitation and maybe your oil leak too.
#9
_JNR_ATE_
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Posted 25 July 2006 - 12:30 AM
Yeah rodomo is heading in the right direction aswell, definately check your timing.
Go to Super cheap Auto, buy the dizzy spanner, $9 roughly i think, set your timing again if its moved then make sure its tight. if you have to replace the paper gasket under the dizzy.
Yeah its a bitch to get sometimes
Cheers
JNR_ATE
Go to Super cheap Auto, buy the dizzy spanner, $9 roughly i think, set your timing again if its moved then make sure its tight. if you have to replace the paper gasket under the dizzy.
Yeah its a bitch to get sometimes
Cheers
JNR_ATE
#10
Tiny
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Posted 25 July 2006 - 09:33 AM
It's definitely worth checking your timing ( infact, before making too many adjustments to anything.. double check everything! Sometimes its the simplest problems causeing some serious symptoms!)
Once you know the dizzy is right ( and often people leave out a little gasket which causes oil leaks), then you could look at the carby.
If its running excessively rich you may have perforated your power valve via a backfire. this leads to a leak straight through that circuit into the manifold!
If its only a hesitation and very minor, try giving that pump activating arm 1/4 of a turn more tension to bring it on earlier and see how that affects it. If it clears it up you may be on the right path! (Be aware that holley accelrator pump cams have 2 position they can be installed in.. you MAY be able to change its position to gain the adjustment you need rather than changing cam!).
I hate these tiny little problems, but working through them from the most simple to the most complex is the way to go! Best of luck!
Once you know the dizzy is right ( and often people leave out a little gasket which causes oil leaks), then you could look at the carby.
If its running excessively rich you may have perforated your power valve via a backfire. this leads to a leak straight through that circuit into the manifold!
If its only a hesitation and very minor, try giving that pump activating arm 1/4 of a turn more tension to bring it on earlier and see how that affects it. If it clears it up you may be on the right path! (Be aware that holley accelrator pump cams have 2 position they can be installed in.. you MAY be able to change its position to gain the adjustment you need rather than changing cam!).
I hate these tiny little problems, but working through them from the most simple to the most complex is the way to go! Best of luck!
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