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Air filter causing miss at idle???

sumfatchin

By sumfatchin,
in Engines & Forced Induction

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sumfatchin Enthusiast

sumfatchin

Posted
Posted

I recently Swapped my K&N Pod filter with a HKS air filter.

When i first installed it, everything seemed to be running fine, but a couple of days later the car started to sound really rough at idle. The rev's dont seem to vary much, but the car now shakes a bit at idle and a kind of farting noise comes from the exhaust. I can't really tell if it's RPM 'hunting' or if its some kind of miss.... any ideas???

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https://www.sau.com.au/forums/topic/25127-air-filter-causing-miss-at-idle/
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sumfatchin Enthusiast

sumfatchin

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cheers, just tried reseting the ecu (the only easy one to do), was stoked cause at first it idled fine, then revs dropped a bit and it started to go rough again. Maby i should take it out right now and thrash the tits of it... yeah ill go do that:)

Cubes Grand Master

Cubes

Posted
Posted

I've got the same problem. Always have, My afm plug is a little dodgy as once on the dyno when the afm was fitted the ecu went in to limp home mode. + lots of black smoke out the exhaust.

We then swapped afm's and all was fine.

Then pluged mine back in and it was ok.

I've come to accept it.. Bump the idle up to around 850rpm and it is ok.

Cubes Grand Master

Cubes

Posted
Posted

On the back of your plenum there is a ACC valve. The idle screw is in that. It is nearest your firewall. It also has a plug leaving it and a what looks like 1/2" hose going to it.

Bring the car up to operating temp then adjust it. You have to come at it from in front of your clutch master cyclinder there abouts.

Do a search on the ACC valve I posted a pic quite some time ago now.

Guest RedLineGTR

Guest RedLineGTR

Posted
Posted

but if it was working fine with the older filter u shouldnt need to adjust it. Clean the AFM reset the ecu and give it a drive for a little bit see over a couple of days and then try the idle setting adjustment. Why did u get a HKS filter for...they dont filter good at all the only thing they filter is rocks and birds :) But thats your choice so it will give u a feel in the difference when revving but at a cost. Anyways hopefully it works out fine.

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