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Sticking throttle
https://www.ausmini.com/forums/viewtopic.php?f=2&t=1851		 Page 1 of 2
Author:  thommo09 [ Fri Sep 10, 2004 12:00 pm ]
Post subject:  Sticking throttle
hi all,

i was hoping someone might be able to help me out here....i was driving home the other day and the throttle stuck open...turns out the cable snapped. No biggie, i just got a new one and put it in. The problem is that last night on my way home the throttle started to stick open again.....only this time i cant figure out why.....i'm about to have another look, but when i had a quick look last night everything seemed to be where it was supposed to be.......has anyone had a similar problem or know what it might be? It's just a bit scary when ur cruising along and go to slow down and all of a sudden hear about 6000rpm....rather than 1000!! :shock:

cheers
-jimmy
Author:  J_A_M [ Fri Sep 10, 2004 12:24 pm ]
Post subject: 
What sort of carb are you running?

When it sticks, is your accelerator pedal stuck down, or does it return to normal position but the revs remain high?

Does the accelerator pedal feel right when you depress it?
Author:  thommo09 [ Fri Sep 10, 2004 12:53 pm ]
Post subject: 
sorry...im running an SU (1 1/2 i think....) and yeah the pedal is stuck down, not returning to the normal position....i'm prety sure the cable is just catching on something, but i cant figure out what yet
Author:  Gordie [ Fri Sep 10, 2004 1:05 pm ]
Post subject: 
is the return spring on the carb there?
and did u put a new one is or a s/h one, cos sometimes when the wire starts to split it can cause it to grab and stay on.
Author:  thommo09 [ Fri Sep 10, 2004 1:06 pm ]
Post subject: 
nah it was new cable and the return spring is on and looks like its working
Author:  J_A_M [ Fri Sep 10, 2004 1:09 pm ]
Post subject: 
yea the return spring on the carb is the obvious one to check.

Hmmmm.....when you open the throttle by hand AT THE CARB, does the carb stick?

Try disconnecting the cable from the carb and depress the accelerator pedal. Does it stick? Thats a pretty good process of elimination.
Author:  thommo09 [ Fri Sep 10, 2004 1:13 pm ]
Post subject: 
GOT IT! thanks for the help guys

the cable was a bit too long and was catching on something down in that void between the engine and firewall (god knows what :? )....just shortened it by about 2 inches and it seems to be all good now :D

thanks guys :)
-jimmy
Author:  tzi [ Fri Sep 10, 2004 4:52 pm ]
Post subject: 
I have the same problem.... but it onyl happens on really cold nights after I have been driving at 100 for 30min or so.... I figured it was the SU freezing up :shock:
Author:  min13k [ Fri Sep 10, 2004 7:36 pm ]
Post subject: 
yep that is carb iceing up not enuff heat funny that hey
i never had that hassle with the hif 44
makka
Author:  dr trim [ Fri Sep 10, 2004 7:50 pm ]
Post subject: 
i was going up a hill not long ago and foot flat (prolly the second time i've ever foot flatted it) and a laser pulled out in front of me and i clutched in a braked and it revved to like 6000 grand coz the pedal stayed where it was, then it just came back about a second later.


problem is a got a new cable, pedal, and throttle return spring fitted just after buying the car, all new except the pedal was s/h but in gc.
this is the only time it's happened and i dont mind never going flat foot again :wink:
Author:  min13k [ Fri Sep 10, 2004 8:03 pm ]
Post subject: 
might be the cable catching
makka
Author:  tzi [ Fri Sep 10, 2004 8:06 pm ]
Post subject: 
:shock: didnt you know... thats where all the power is :lol:
Author:  min13k [ Fri Sep 10, 2004 8:21 pm ]
Post subject: 
could be the reason just like we get pind to the seat on hard acelleration maybe to carbi stuck open due to the g's you were pulling at full throtal
makka
Author:  PhildoD [ Fri Sep 10, 2004 10:14 pm ]
Post subject: 
Carby icing is not uncommon, and the smaller the throat the more chance you will have of it happening. Icing can occur at any temperature between -10C and +30C. This is due to adiabatic cooling, which is the drop in pressure due to the increase in velocity past the venturi. (Boyle's Law) hehe, I actually remembered something from year 12 Physics........ :roll:
Author:  drmini in aust [ Fri Sep 10, 2004 10:37 pm ]
Post subject: 
PhildoD wrote:
Carby icing is not uncommon, and the smaller the throat the more chance you will have of it happening. Icing can occur at any temperature between -10C and +30C. This is due to adiabatic cooling, which is the drop in pressure due to the increase in velocity past the venturi. (Boyle's Law) hehe, I actually remembered something from year 12 Physics........ :roll:


Heh, get a Weber or Dellorto, bigger the better then!! :lol:
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