[mgladwin]

Hi everyone,

I have an SJ70 which has a high idle issue, even when warm.
My dad thinks its something to do with the auto choke but I am not sure.

What are the things I should be looking for?

I adjusted the throttle stop screw and that made the car idle much better but apparently its revving up around 1500rpm again warm.

Any advice would be appreciated.

Cheers.

[Dec]

Hey mate, I realise this a different carby issue but check out the picture.

viewtopic.php?f=37&t=48124

Cheers Dec

[coily96]

You have two screws to adjust, we will start with the cold idle screw.

Location: rear of carby where trottle arm is.
When to adjust: cold engine only.

The cold idle screw can only be adjusted with the engine off, so firstly with a cold engine start it up and note rpm, if it needs adjusting turn engine off and make the adjustments, start engine and note rpm, adjust if needed as before.

Next is the hot idle screw

Location: engine side of carby. (Note its not the lower mixture screw with the tamper proof head)
When to adjust: hot engine after choke has come off.

With a hot running engine adjust screw to desired idle. Thats it.

I think you have the two screws mixed up or you didnt know about the hot idle screw.

So with a cold idle adjusted to rev a bit higher with the choke on, as the engine warms and the choke comes off the hot idle takes over.

These settings can be totally wrong if the accelerator cable is too tight on the carby end.

[mgladwin]

Thanks for your replies. I will do some checking and follow your posts and see what happens.
Your right, I was clueless that there were two screws to adjust so thanks for that.

How can I check that the auto choke is working as it should?

Is it a matter of looking into the carby at the choke butterfly and watching it warm up from cold to warm?

Cheers.

[coily96]

Yes remove the inlet pipe off the top and see if it opens from cold.

[Heideisadog]

Don't want to hijack here, but I too have high idle (2000rpm) and if I set it any lower, which I can but not much more. The car dies when I brake semi hard or come to a stop.
Checked all vacuume lines and they are all replaced and in the right places. So I'm pretty stuck, heard it could be the timing, but I haven't fiddled with it at all.

Thanks
Thomas

[yareckonillgetupthat]

My is the same I swapped Carby for one that was idling at 900 as soon it was on my engine it was idling back to 2000 still haven't figured it out???? My water pump is leaking dunno if that would affect it

[alien]

^ air bubble in the coolant which has stopped in the auto-choke - so its not getting warm coolant passing through and hence is stuck shut?

[cairns27]

If the idle is changing when you touch the brake, I'd be looking at the vacuum lines again.


bye

[yareckonillgetupthat]

i fixed mine finally this is what i did , i noticed when engine was hot the one of the water hoses that goes to the brass t fitting at the back of carby wasnt as hot as the radiator hoses so i pulled it off , put a hose clamp on my garden house and and turned it on slowly i then did this with the hoses i pretty much flushed every thing i could then i flushed radiator ect it took me 6 weeks to figure that out i even replaced my carby but i probaly blocked it the first time i kicked it over as i had that head gasket shit in my radiator to try seal my water pump any ways i hope this helps good luck.

[mgladwin]

Which nipple did you put the hose onto?

[yareckonillgetupthat]

The brass horizontal one