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Funny idle


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So a few months ago my car (1999 STI Type R) developed this idle problem. It only happens every now and again. So not on every drive. But once it starts this idle it won’t stop until I have turned the car off and let it cool right down.

It throws the code “24 air control valve”. I have changed this with a second hand cleaned one but problem persists. I have also put in a brand new air flow sensor.

When it starts, I can be driving along normally then come to an intersection put the clutch in and the car will rev all the way up to almost 5k rpm, drop down to 1k rpm and pulse from 1-2k rpm.

Any ideas or seen this before? Try a new IACV? Possibly an O2 sensor?

 

 

 

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  • 4 weeks later...

I've had a very similar problem with my '98 STI. I believe it's called a 'Hunting Idle' and from the research I've done it seems as if it's an issue with the IACV. Have seen on some forums people recommending to pull the idle speed controller and give it a spray with some electrical contact cleaner and give it a wipe down. While it's out might as well have a look at the throttle body and surrounds. 

I haven't had the chance to give this a go myself yet, but if it works it seems like a pretty quick fix if that's what the issue is.

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15 hours ago, brucestubbs said:

I've had a very similar problem with my '98 STI. I believe it's called a 'Hunting Idle' and from the research I've done it seems as if it's an issue with the IACV. Have seen on some forums people recommending to pull the idle speed controller and give it a spray with some electrical contact cleaner and give it a wipe down. While it's out might as well have a look at the throttle body and surrounds. 

I haven't had the chance to give this a go myself yet, but if it works it seems like a pretty quick fix if that's what the issue is.

Cheers mate. I have cleaned th IACV and

replaced the throttle position sensor with a second hand one. 

Just recently I replaced the O2 sensor and boom, fixed the problem. Just a game of guess and check because it wasn’t throwing a code. 

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  • 5 weeks later...

Had similar issues where my idle shot up to 2500-3000 and then down to 1000 after I let my car sit for a bit. Cleaned out TB and IACV with brake cleaner. That sorted it out as it was gunked up but I still have a bit of an idle issue where it doesn't stay in one setting when warmed up. I.e constantly 'hunts' between 600-1000rpm. Did you have any write ups or videos you used to help you replace o2 sensor as I've never done that before. Cheers

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