Odd high idle issue (SOLVED)

[smitche]

under normal conditions my car idles at about 800, pretty normal... however, if it sits at idle for a while (like in a drive thru) the idle bumps up to 1200-1500. now, the last couple days the drive up to my house (about a mile of roughish, hilly dirt road and very slow, low idle speeds) the car will idle at about 3k... I unplugged the ICV and nothing changes, so I'm guessing that's bad and I ordered a new one, but is there anything else I should look for?

***replacement ICV solved the issue***

[603Racing]

Sticking throttle cable/throttle position. Vacuum leaks. That would be the first two things I'd look at.

If it creeps up in idle when you're not using throttle at all, then it's probably not the cable. More likely vacuum leak.

[smitche]

let me explain a little better... the idle doesn't creep up at all. If i'm sitting at idle, it remains at 800ish... if i've been sitting awhile once I blip the gas, the idle only comes down to about 1200, if I WOT it to higher in the rev range the idle will come back to 800ish... if it's at low rev speed for an extended period of time (10 mins or so) the idle will not drop below 3k unless I WOT again, then back to 800ish.

[603Racing]

I'm leaning towards the throttle cable or related part sticking. Next time it's at a higher idle. Check the throttle body to see if it's at the idle position or if it's stuck at any position beyond idle. Could be a problem with the throttle cable or a gunked up throttle body.

[fronton]

I have a similar problem. Let us know if it turns out to be the ICV.

[smitche]

I'm leaning towards the throttle cable or related part sticking. Next time it's at a higher idle. Check the throttle body to see if it's at the idle position or if it's stuck at any position beyond idle. Could be a problem with the throttle cable or a gunked up throttle body.

was my initial thought as well, but it's not. there is even a tiny bit of slack in the cable between fully closed and starting to open. it's gotta be either vacuum or icv. bought an icv and intake boot and they should be here friday, i will keep you posted.

[603Racing]

Have you looked inside the TB to make sure it's closing all the way? You can also check the TPS to make sure the TB is getting to the closed position.

[Norbert]

What does ICW and TB stands for? I am yet new and trying to resolve my idle and cooling problem. Could an idle be caused by the bad connection between banana manifold which goes towards the silencer (the first box not sure if that's how it is called)?

[smitche]

What does ICW and TB stands for? I am yet new and trying to resolve my idle and cooling problem. Could an idle be caused by the bad connection between banana manifold which goes towards the silencer (the first box not sure if that's how it is called)?

ICV = idle control valve (T shaped valve connecting to the intake boot)
TB = Throttle body (in between intake boot and intake manifold)
Intake boot = Pretty sure that's the "banana manifold" you are referring to

if you're experiencing both cooling and idle issues, you may want to test your coolant temp sensor

***Problem solved with ICV***

[fronton]

Thanks for reporting back, I'm very pleased to hear it was the ICV. Did you also disconnect the ECU or battery for the ICV swap or just unplug, swap and plug back in?

[smitche]

I did not reset anything, just plugged it in and took it for a drive. After getting back up to the house, still idling @800.