Hi all
I have a 99 wrx bone stock
Lask week it through a cel light so i checked for fault codes it popped up 23.so i ordered a new maf from ebay
I installed new maf and it was running like a pig flat spot when reving it up and nearly stalling.i done a ecu reset no change after that checked codes again and popped up maf and iacv this code wasnt there before new maf was installed so i cleaned the iacv with carby cleaner and still no change next thing i done is contacted the supplier and they sent me a new maf. i got the new maf and still was faulty HELP the car drives fine with old maf but now and again i get hunting idle and a cel need help here please iam really confused of were to go next

Have a look here

Dunno if Mao is still on here (cbf checking), but his stock was the genuine article which is supplied to Subaru, same part# and all. In any case, there is some good info on there. I feel your pain re the '99 AFM, they are too darn sensitive, and I've replace a few in my time.

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MY99 WRX sedan WRC blue Sold :(
MY99 WRX sedan Dark blue pearl :D
MY97 Liberty Outback Ltd Wagon
1990 Mk3 Supra turbo fully rebuilt 7M-GTE (Older son)
1991 Celica GT4 (Younger son)

Ebay MAF's are Chinese copies - Avoid like the plague.
The hunting idle is a dead giveaway for a cactus MAF on a 99-00 GC8

Do not drive on boost at all until you sort it or your next purchase will be a motor.

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Thanks for the replys looks like oem is the way to go and i only driven it a few times no boost.
Much appreciated rossco

Did you check with Mao? As mentioned his item is the genuine article supplied to Subaru. Wouldn't mind knowing myself for future reference.

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__________________
MY99 WRX sedan WRC blue Sold :(
MY99 WRX sedan Dark blue pearl :D
MY97 Liberty Outback Ltd Wagon
1990 Mk3 Supra turbo fully rebuilt 7M-GTE (Older son)
1991 Celica GT4 (Younger son)

Yeah checked with mao he still operates and stocks mafs taking my car there tomorrow

Thanks dude... hope it all goes well for you. 😊

Sent from my SM-G900I using Tapatalk

__________________
MY99 WRX sedan WRC blue Sold :(
MY99 WRX sedan Dark blue pearl :D
MY97 Liberty Outback Ltd Wagon
1990 Mk3 Supra turbo fully rebuilt 7M-GTE (Older son)
1991 Celica GT4 (Younger son)

Same deal here, bought the MAF from ebay, didn't work, got sent a replacement, also didn't work. Cleaned my old MAF, works better than the Ebay MAF! let me know how you go with Mao, might have to buy one too....

Is there a contact number for MAO? I tried to PM him but no reply. I would also like a new MAF for my GC8 as the one I got from eBay did not fix my hunting idle.......
Cheers

Evolution R , Google it for the number. He doesn't come on here much