HELP!! increase in revs while ideling

[taslucas]

How long does the idle stay high? Does it return to normal idle after a quick jab of the throttle? If it does then it might have something to do with the auto choke.
Is it only when you start up or does it rev high after driving for a while?

[steelo]

My rb30 does similar stuff, but when it warms up (time can vary) it runs normal. I've also removed the fuel warmer "net" from the carby (in the poly/plastic plate) but & also widened the spray chamber just at bottom of chamber as the last 2 cyl/plugs didn't seem to be getting the same amount of spray/fuel.

[pearcey]

Hi Shaunh.
There is a small spring between the choke fast idle cam and the carby body which if fitted incorrectly will catch the cam and cause irratic ideling.

[thebeatjackson]

you've probably sorted it by now,
is your hand throttle all the way in? my revs vary when I use that, not quite from 400 to 1800, more 500 to 1000, I'm doubtful that that's the cause, but worth a check. by hand throttle I mean this
http://www.nissanpatrol.com.au/forum...highlight=lock

[the ferret]

Sticky throttle cable, loose carby, sticking butterfly in carby, sticky choke mechanism, vacuum leak, faulty PCV .worn butterfly shaft.
Cheers, the ferret.

[johno90]

revs go up and down at idle = hunting = leak in manifold, easy way to check is get something like t/b cleaner and spray around all contact areas if revs change when spraying at a certain spot theres your leak

[saw13]

Might possibly be the carby needing an overhaul, i had this problem in my old 91 GQ nd it fixed the problem, then i converted it to EFI lol

[Robo]

Get yourself a manual and start checking for something wrong on carby by the specs given.
I'm leaning towards what pearcey said about the spring, possibly even broken.
there's something funny going on around this area.
but it really should be a pain to start if you don't touch the acc pedal to start especially cold starting.
that's how choke is engaged, you have to push a little to activate auto choke.
cheers

[HammerBuilder]

So how'd you go shaun with your rev problem is it sorted now or are you still playing? Also check your vacuum hoses for leaks even down to the hose from the rocker cover to the inlet manifold. anyway see how you go & let us know whats happening.

Cheers Tony