NA Honda K20 not idling right

Honda, Audi, Duratec engined variants
IDG
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NA Honda K20 not idling right

Post by IDG » Sat Feb 28, 2015 12:15 pm

Hi,

Started the car for the first time in a little while and it began to warm up at revs 1000-1200rpm, but after about 5mins went to 2000rpm and a couple of minutes later started to bounce between 1000-2000rpm every couple of seconds quite rhythmically. It drives ok but as soon as you go back to idle it does it.

Any ideas?

Cheers, Ian :eh:
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Benja
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Re: NA Honda K20 not idling right

Post by Benja » Sat Feb 28, 2015 12:31 pm

I had similar once and it was a vacuum leak - perished hose check all those first.

AndyD
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Re: NA Honda K20 not idling right

Post by AndyD » Sat Feb 28, 2015 1:07 pm

Benja wrote:I had similar once and it was a vacuum leak - perished hose check all those first.
Yup, hose or manifold leak can also be the IACV is getting stuck - unfortunately it still exists even on the Honda - easier to access though as its part of the throttle body.

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Benja
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Re: NA Honda K20 not idling right

Post by Benja » Sat Feb 28, 2015 2:15 pm

Yeah I've had both a cracked manifold and a perished hose. When it did that hunting idle thing JDS fixed it I'll have to look through my old emails...

IDG
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Re: NA Honda K20 not idling right

Post by IDG » Sat Feb 28, 2015 2:30 pm

Cheers chaps.

Sounds like it needs a visit somewhere. :(

Any concerns driving it?
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Benja
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Re: NA Honda K20 not idling right

Post by Benja » Sat Feb 28, 2015 2:33 pm

Nah I drove mine back from Bedford and then to Dudley. I did feel like a twat driving through London as every time I stopped it was rev'ing between 1k-3k revs like a reet boy racer!

raw
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Re: NA Honda K20 not idling right

Post by raw » Sat Feb 28, 2015 7:23 pm

Used to have same issue with mine after sitting over winter

Would try cleaning IACV

Is simple enough

IDG
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Re: NA Honda K20 not idling right

Post by IDG » Sat Feb 28, 2015 7:28 pm

Ta

You give me hope

:)
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Muu
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Re: NA Honda K20 not idling right

Post by Muu » Sat Feb 28, 2015 8:17 pm

yeah take the TB off, and then clean the IACV mounted on the bottom out with carb cleaner or solvent etc (petrol if need be).

IDG
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Re: NA Honda K20 not idling right

Post by IDG » Sun Mar 01, 2015 9:17 am

Hi, been Googling the IACV cleaning and there's a suggestion that before I do this I can test if it's the problem by putting my finger over a hole in the throttle body. That sounds like a useful time saving test. But where's the hole (that's not Googling so well) and any tricks of what not to touch when the engine is running (eg. I and the butterfly will be moving with the surging)?

Cheers, Ian
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