24 replies to this topic

[XXB4XX]

Hi Guys..

The new GT seems to have a little skip in it's idle, it's on and off.. but at the same time it's using a little more fuel than it should also..

I spoke to my mechanic and he reckons it has to be the AFM 100%, I thought it may be an injector, but he clarified that the injector would cause the problem sporadically even as I was driving (has a point there), and further thoughts went towards AFM cause he reckons once a soooooooooobi is picking up off readings from the AFM it will over-fuel to be safe.

What are your thoughts?

(Part number is the same as the B4- 22680AA310) I'm thinking the car being in the dusty / gravel / sandy / no tar roads of Bega and the fact that it was only serviced by the shods at a subaru dealership would have to have buckled it.

[RX25SE]

Im fairly sure yours is a hot wire sensor. Might be worth giving it a clean first.

You can by AFM cleaning spray (aerosol can) from Bursons/Repco etc.



As far as false readings causing a rich failsafe......Mmmmm. Never heard of that one.

[XXB4XX]

Thanks dude, my initial plan of attack is a can of contact cleaner

Try the 10 dorrar fix before I go any further

[bobbyjimmy]

I'd lean towards Air Fuel Ratio sensor (in the dump pipe just before the cat) or O2 sensor, pretty common on that model - do a search on Liberty.asn.au

[CRUISN]

Clean the afm out for good measure, but id say its more the o2 sensor located in the top of the dump just after the turbo. My Gen4 would sometimes idle rough/up and down a little when I came to a stop at lights, etc. Replaced the o2 sensor and all good. Common problem with the early Gen4's.

Cheaper than Subaru prices....

http://cgi.ebay.com....=item45ea6a8d15

As for the fuel usage, thats probably an issue related to your right foot.

[XXB4XX]

Can the o2 sensor be cleaned with correct cleaner?

I kinda had a suspicion about it too..

As for the right foot.. I absolutely grandpa this thing along, thrills not there anymore

[Alex]

Brendan.


Go with the o2 sensor.

Bursons is your friend here. Bosch unit FTW.

Need a hand with it?

[RX25SE]

Common problem with the early Gen4's.

Must run closed loop idle.

[CRUISN]

Can the o2 sensor be cleaned with correct cleaner?

No.

When I fitted mine and the ecu adjusted to it, my fuel economy did get better.

[XXB4XX]

Thanks heaps for your help, looks like SC actually does have some technical knowldge

But!

CRC MAF Cleaner - FTMFW!! drenched the mofo repeatedly and let it dry each time.. It now idles like a brand new Bentley. If it plays up again then atleast I know what the issue is and I'll replace the air flow meter.

Alex- thanks matey, love your generosity bruva, I spotted the o2 sensor, need asianese hands for it me thinks, I'll get good old IS Motoracing to get his hands dirty!, he diagnosed the problem as always with just a phone call

Found a place in the states that sells OEM parts and they have it for 175us delivered.

[Alex]

$175 is a rip.

You should pay no more than $100ish from a bursons, plug and all.

Is the o2 sensor a three wire one? four wire?

ive changed more o2 sensors than you've had sunday dinners.

not hard to do.

Marty & Moog have succinctly described it.

here

[XXB4XX]

Hey Arrex, the o2 sensor is not 175, its the MAF/AFM I'm referring to bro.. Subaru want 500+

[alexGT]

i'd be trying upper engine cleaner too. its only $14 and can fix a whole lot of niggly problems

[legacy rsk]

could be a few things brendon

i got 4 cans of that if you want to buy it brendon $40 pickup mate

[XXB4XX]

Hey Shane, 40 each ? Or 10 each? If it's 10, are you still in Brighton? I'll get one off ya

[XXB4XX]

Just an update peeps,

ACA - ox204

4 Wire o2 sensor for $126.00 repco / auto-one, have to solder the wires together, but meh.

Still waiting for my AFM to come in though, so either way it has to be one of them!

[Soop]

Ahh fork that, there's a mob on the net who sell them with the plug ready to go for about $60 a pop. I'll get it for you tomorow when I'm not drunk and on the other computer. The o2 sensors that is.

Pitty you cant go MAFless and just fork the AFM off totally mate. Be cheaper.

[B4TT]

Don't mean to hijack the thread blokettes but does anyone have a part number for the 02 sensor in the dump for a B4? Alex?

preferably not a subaru genuine one.. and do I have to solder any of the after-market ones ?

[Soop]

What brand is the Genuine Subaru shit?

Don't tell me Subaru or I'll slap you.

[buzzda]

Just had a look at the one that came out of mine. Brand is Denso, part no #22641 AA090, 99% sure it's OEM... just googled it and it came up as a Subaru part no#.

*Edit* Sorry, didn't read it proberly, that's the front one (in the man.), the rear one (in the dump) is part no#22690 AA510, it's Denso too.