B16A2 Idle problem (intermittent)

Thanks mate, I think you have already done most of the DIY's for the y4 so i dont know what i can add lol, definately owe you some rep points when i can give them out as your DIY's helped me sort out the EK before i got my e-stack of service/workshop manuals:)

Thanks to U too mate,it feels good to give back as I've always said :)

The black thermal wrapping looks so MAD!

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Originally Posted by TbM

Dorikin my TPS was at 0.51 volts at closed throttle and i adjusted it and noticed a difference so would recommend doing it, i had to hacksaw a line in mine and remove it with a flat head but it doesnt take long. I dont think the wot reading is as important as the closed.

If you didnt clean the IACV properly the first time then that could still be causing your idle issues, use subaru upper engine cleaner or if you cant get that bezza knows another cleaner that works well and remember to let it dry before reinstalling it, reset the ecu when your done. Ive never needed to use wd-40 or other lubrcants when i fully clean the IACV, if its sticking its still dirty.

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I'm definitely taking the IACV off this weekend and giving it a good clean. Beeza, what kind of cleaner would you recommend, some sort of carby cleaner?

Failing that, I'll re-adjust the TPS to exact specs..

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Originally Posted by TbM

if you did it while it was idle hunting then i would rule out vacuum leaks and throttle body not sealing, if you did it while it was idling normally it could just mean the TB plate was sealing nicely at the point in time but may still be intermittently leaking.

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I'm fairly sure I did it while it was idling normally... I don't think theres any problems with the TB plate, it opens and closes very freely and seems to have a good seal

I might grab a can of carby cleaner and check for vacuum leaks anyway, I've never done it before so might be worth checking


Thanks for all the help guys. Rep points for all.. hopefully see some results this weekend :D

Beeza has recommended a product that is like subaru upper engine cleaner, heres a quote from one of his DIY's

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Originally Posted by beeza

I only use Suburu Upper engine cleaner to clean with now OR another product which I reckon is subi upper engine cleaner in another bottle is 'Engine conditioner',it's a Japanese product,i.e Japanese writing on the bottle and it's brilliant.Carby cleaner is crap.

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Ive only used the subaru product as i live near a subaru service centre so its easy for me to get but i havent seen the japanese one around.

I still recommend setting your tps to the correct setting even if cleaning the IACV fixes the hunting issue.

Hopefuly you get this sorted out soon, Good luck :)

Thanks mate,yes it's 'super engine conditioner' :)

Cool Thanks guys. Beeza where would I be able to find this product? Im guessing it probably wouldnt be available at general auto stores like Repco?

I googled it and i think hes talking about "threebond super engine conditioner"
http://www.mcsonline.com.au/componen...t/tbd30-P0.gif
Its got japanese looking writing below the main label, call your local auto stores and ask if they stock it or if you have a subaru parts centre near by you can pick up some subaru upper engine cleaner for about $17 a can, they are a small can but very effective:thumbsup:

He is :)

Any good auto retailer should stock it mate.

Did some research and googling as well on the ThreeBond product and definitely some excellent reviews on it.

Gotta get my hands on it this weekend and give it a shot :D

Here's a list of ThreeBond distributors in Australia for anyone else wanting to buy the product: http://threebond.com.au/distributors.htm

And as a matter of fact Repco is listed at the top!

did the problem fix? i got the same problem on my b16a. it doesnt always happen but if it does its usually when im stopped at the lights. is it a problem if i leave it like that?

I went at it with the Engine Conditioner, taking apart the throttle body, adjusting the TPS and cleaned every thing including inside the intake manifold but it never ended up fixing the problem. It may have even made the idle problem more evident for a little while because I cleaned some of the seal between the throttle plate and throttle body bore.

But the Engine Conditioner did improve the throttle response and acceleration felt a lot smoother so I was happy with that.


The problem only ever seems to happen within the first 10 minutes of starting the car so it might be a sensor problem, possibly IACV?

Yeah my iacv has been changed and Erraticated the problem. But it still came back, hmm?