Fluctuating idle

[Jay101]

Hi guys journey home today, stopped at lights and my revs increased to 1400-1600 fluctuating ...any possible thoughts?

Idle control valve?

 

[skymera]

Private video Jay

 

[Jay101]

Thanks Skymera, updated ..

 

[skymera]

Could be the idle valve, give it a check. But don't trap the little O ring!

 

[davyboy]

I had that, changed my throttle body - sorted.

 

[Jay101]

Problem solved. Idle control valve completely chokka with carbon..cleaned in the parts cleaner tank.. valve was sticking

 

[skymera]

Problem solved. Idle control valve completely chokka with carbon..cleaned in the parts cleaner tank.. valve was sticking

Mine's probably gummed up too, I've the same rev problem like you did.
I used carb cleaner and gave it a squirt, didn't help.

 

[Jay101]

Mine's probably gummed up too, I've the same rev problem like you did.
I used carb cleaner and gave it a squirt, didn't help.

Try twisting the green cylinder back and fourth inside it Skymera

 

[pollyp]

Try twisting the green cylinder back and fourth inside it Skymera

yea use the carb cleaner to loosen/flush the dirt out and rotate the valve back n forth to work loose the dirt and free up the stuck shaft bearing.

if you have a preface, remove the seized waxstat mechanism and recalibrating the IACV when possible also helps.

http://micra.org.uk/threads/pollymobiles-rebuild.35251/page-19#post-446256

 

[skymera]

Try twisting the green cylinder back and fourth inside it Skymera

Never knew you could

 

[Jay101]

Reviving the thread due to the problem returning. When changing gears on the road the revs didn't drop. So have taken the I/c/v back off to clean. Stayed at 2k..

Now it stands at 1k fluctuating when warmed up. Any ideas?

 

[MicrAde]

You removed the waxstat Jay? If not, I would if I was you.

Sent from my HTC One S using Tapatalk 4 Beta

 

[frank]

i doubt if a sticking i/c/v will fluctuate personally (they either stick in 1 position, leak past the O ring, or work ok imo) you need to plug in a usb cable and observe what is causing the problem really jay

 

[Jay101]

Yeh. I'm looking at a wiring diagram. Possible idle control relay. I believe our system have two idle control and it's bypassing the main one causing the secondary to surge.

 

[frank]

mine was fluctuating last year once, and my i/c/v has been removed !
you might find that its the ecu altering the spark timing back and forth jay

 

[Jay101]

Turns out when I put my idle control valve back in I split the o ring and stripped the valve and the top of the rod has wear.

 

[r-reg-sr]

rod ?

you could unplug and see if problem remain,,,,always listen to frankspeed

 

[pollyp]

has the IAV been configured properly via my guide?
if the idle bleed screw is open too far and the IAV is wayy off alignment it could open too far (especially when the usually seized waxstat keeps the throttle slightly open), fast idle too much, ecu dunno how to bring it down any further with the IAV cos it thinks its fully closed and starts hunting.

always install parts involving o-rings with wd40 and a delicate feel. it should just "slip" in by hand and then feel the metal surfaces butt up solid, only then do you screw it down.

if it feels spongy as you push & twist it down (compressing the trapped rubber seal) and it rebounds back up, then take it back out, check its still in the right place, smear of wd40 on the seal and carefully try again till it pops in

 

[Jay101]

Thanks for the replies, I havnt adjusted the waxstat, what I have done for the time being is adjust on the idle control valve. Can't remember which way I turned it but it's at a full angle. This is keeping my idle at about 1200rpm warm engine temperature.

I'll look into tour blog Paul, thanks