rough idle when stationary

[nathany]

Hi there

It is going into shop tomorrow to get an idle fixed. However I thought I would throw this out there. I could not find a definitive answer and I know these issues can be a number of things. However I start the car in the morning and it idles fine on warm up. but after I drive it around when i come to a stop it starts to isle rough and jump up and down between 0-1000 revs. It has stalled once on me so when stationary I sometimes give her a few taps of the throttle to keep her running. No issues when driving.

I have cleaned the carbon out of the idle controller valve. Might be time for a new one. Just wondering if anyone else had this issue and what they did to fix it?

Cheers

[funkytown]

did you have the IDC set back in the correct position as measure by multimeter?

(unless you have a link ecu).

[nathany]

this car had a macbuilt v5 ra engine put in. i have no idea what they did hence why its going into my mechanic. I am a dunce when it comes to engines, therefore I leave it to the pros to sort for me

Here is hoping it is a quick fix. I dont want her to be sitting in a shop for a week

[Joker]

I had something similar : because it was running on 3

check coils plugs

[Marky]

Afm fault can cause similar symptoms

[Joker]

things warming up and creating airleak?

[greatdanz]

same thing happened to me last two weeks, I changed everything ICV, BOV, BOV spring, still nothing, turned out it was my alternator the whole time, when it was cold the car was fine idled okay (link, no afm,untuned at the moment) anyway when the car got hot ,or the normal op temp the fans would come on causing the car to idle hunt really bad till it stalled... turned out my alternator was putting out 13.5V on idle and when the fans came on, it dropped to 12.2V, rebuilt my alternator and we are good

just a another avenue for you try

cheers

[nathany]

Cheers everyone. Seems like it could be a whole raft of things lol ill update this post when i find the cause

Update

Mechanic thinks its the idle calve control motor. New suby one is 740 plus gst ??!!!!!!! However try and source a second hand one. If anyone knows of one for a v5 ra engine going cheap and in good working order please let me know

[nathany]

Going to check alternator also so thanks for the tip above !

[Guest]

Pull it off only 2 screws then wipe it with brakleen. Mine was gummed up as fuck.

[nathany]

cleaned all the carbon out of it. its either stuffed or its something else. checking the alternator tomorrow and otherwise trying to source an old idle valve from one of the many ex v5-6 rexs out there in the wrecking yards no doubt

[Marky]

same as b4 legacy as well - thatll help you find one pretty quick

you can test it easy - remove it, plug it in, turn the car to on (dont start it) and it should do itl little self test thing, youll see it whirr in and out

if it doesnt, theres your problem

[nathany]

Awesome. Cheers. You will have to bare with me, I do search the forums for answers but you may find I might ask some really ignorant questions on these forums. But I am learning lol I would like to know how to do more with my car myself vs paying the earth for a mechanic. However I know my limits...

[Marky]

better to ask a stupid question than just do something stupid all on your own haha

seen all too many people either fork out cash for things not needed OR make things worse with simple mistakes, you\'ll be fine

if it helps ive had 2 idle valve things break on two seperate cars, they do get gummed up and also just mysteriously die

[nathany]

Cheers Marky. The plan is to check the alternator. And then change the idle valve. If that does not fix the problem the next step is to buy a Volvo

[greatdanz]

least the volvo will be reliable

[nathany]

I vowed a long time ago never to buy a car where some old nana in a corolla gassed me off the lights. A nana in a v8... thats a different story

Plugged in the unit to check the voltage. Seems very constant so its not the alternator. Time to replace the idle valve