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Old 12-03-2008, 02:36 PM   #1
Bryanwrx
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Default Idle problem/maf sensor/wth?

Hi guys, and some gals,

So I drive a 99 impreza 2.2ts (ej22 NA, automatic woohoo). Recently I had changed the intake (after much research) to a weapon R secret weapon. I know the name is really dumb, but their price was right, as was their research, and it had a MAF adapter....finally. So i installed it about a month ago. Yesterday i was pushing it a alittle, at about 5500 rpm, and the car just died. Ignition stayed on, but the engine would not remain running for more than a few seconds.

So I ended up switching the MAF sensor for one from a EJ25 ( same part number). It now runs, but after many ECU resets and about 50km of driving, it still runs rich. Can someone please point out something that may have also gone wrong at the same time.

So at idle it runs rich (black smoke) and is a rough idle. while driving it goes cleanly through the power band no problems. thanks
bryan
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Old 12-03-2008, 02:44 PM   #2
FabFlatFour
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Sounds like your problem could be similar to what williaty researched, not sure though...check out his thread at the link for more details.

http://forums.nasioc.com/forums/show....php?t=1471819
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Old 12-03-2008, 03:33 PM   #3
Bryanwrx
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read that already (but thanks for going through the trouble of finding it). I popped back on the stock airbox and tried to line it up to the snorkus...not long enough. So basically i will be heading to my performance shop and getting a slight extension. if this works then i will do a little write up on it. As well i called my local subaru dealer asking if there was truly a recall on the maf sensors...they are going tog et back to me. thanks btw!
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Old 12-03-2008, 03:59 PM   #4
watchunglava
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nah dude it has nothing to do with that thread!! you just need to rescale your maf and youll be fine. let me know if you need help doing it
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Old 12-03-2008, 04:05 PM   #5
Bryanwrx
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well i reset my ecu (took the negative terminal off for like 2 hours) will that do it?
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Old 12-03-2008, 05:51 PM   #6
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Quote:
Originally Posted by watchunglava View Post
nah dude it has nothing to do with that thread!! you just need to rescale your maf and youll be fine. let me know if you need help doing it
I dont think he can rescale his MAF like we can with opensource. maybe with some other ECU piggyback/software/etc?
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Old 12-03-2008, 05:53 PM   #7
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Quote:
Originally Posted by Bryanwrx View Post
well i reset my ecu (took the negative terminal off for like 2 hours) will that do it?
I hear that holding down the brake pedal for a min or so will bleed off any residual voltage left in the system via the tail lights. id do that, too. That's with the battery disconnected, of course. But if its a MAFv scaling issue, then no, it wont help. if its something else, it might help.

Last edited by RaceFaceXC; 12-03-2008 at 06:21 PM.
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Old 12-03-2008, 06:17 PM   #8
watchunglava
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sorry dude didnt realize open source wasn't avalible for the 99. good luck
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Old 12-03-2008, 11:08 PM   #9
Bryanwrx
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well found the problem. igured id take a guess that the maf sensor i received was also a little buggy, which it was. A trip to my local subbie dealer indicated that after a 77$ bill i needed a new sensor. fixed and runs great! thanks for the help gents
cheers
bryan
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Old 12-03-2008, 11:27 PM   #10
williaty
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For future reference, if swapping MAF sensors doesn't cure the problem like it did for the OP, a failed front O2 sensor, or an exhaust leak before the O2 sensor can both cause this problem as well.
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