idle bouncing between 1100 and 2000. what could be the problem?

[bearback]

my ka is idling horribly.sometimes it idles at 11 or 13, then other times it will go up to 19 or 20.any help is appreciated.

thanks a lot!

[xX RB Xx]

It maybe your TPS.. but mine idles around 900.. but when i first start my car up it idles at 1500 until it warms up.

[tony10]

It maybe your TPS.. but mine idles around 900.. but when i first start my car up it idles at 1500 until it warms up.

yup mines does the same. starts at just under 2k, when it wrams up it goes down to 1100 or 1200 and when i start driving its will stay between 700 and 1000.....or die

it could be your AAC valve. mounted on the back of your intake manifold.

[bonestock240sx]

hey you should check out my post. same thing is happening. check under extremely high idle. i have got lots of information on there. mine still is messed up and idles very high. tonight im going to fluke test all the wires to see if anything is messed up i will let you know what i find.

[RoninRacing90]

my KA24E is doing the same thing... It will idle up to 2,000rpm cold, warm up and still stay at 1,300-1500rpm. If it idles for a very long time it will drop down to 1,100rpm. But never lower than 1,100rpms. If I'm speeding around and I'll put it in neutral; it will rev up to 2,000rpms and slowly drop to about 1,500rpm. Sometimes after running it hard it will even idle up and down at a red light between 2,000-1,300rpm. It's frustrating! Has anyone found a solution? Is it a vaccum leak, thermostat, IAC or ignition? Anyone have an oscilliscope to veiw ignition spark?

[g35paul]

i got the same exact problem now... bout to go tear intake apart and check vacuum leaks... my remove egr to see if that helps out

[240dx]

I had this problem and i had the wrong 02 sensors. try replaceing your 02's if there filthy

[bonestock240sx]

ok so i just had a huge 50 plus post on this. the problem with mine was the TPS its like 20-30 bucks to fix real simple. try it. i thought it was my iacv or my maf, but it wasn't so try the its really cheap to try if its not your not out any money and you ruled out something and you got a new healthy tps. but that was in my own situation which i sprayed injector/intake cleaner through and i hit my MAF which i thought is what messed up. but yeah anyway check out my post. EXTREMELY HIGH IDLE lots of usefull information.