Hi all, i’ve recently bought a 2005 Wrx sti Type UK with the 2.5 engine and when I bought it knew that the MAF has seen better days wth the mileage being 81k and it was slightly lumpy on cold starts but once cleaned it would be alright for a week or two.

I bought a new Bremi MAF sensor from GSFcarparts and also a Mishmoto induction kit for it, and fitted the new MAF with the airbox in place and took it for a 15-20 mile drive and it still seems to feel a little lumpy/ hesitant in general driving but thought maybe it will take a bit longer to get used to the fact it’s not knackered anymore.

i fitted my induction kit this evening and taken it for a drive and it’s fine until you give it some and once it boosts it feels like it holding back and stuttering, this doesn’t seem to improve the longer I drive so just wondered if there is anything else it could be, i would say the general feel of the car is worse even just changing to the new MAF sensor on the standard setup.

Sorry about the essay and thanks in advance! :)

Thanks for the replies! Yeah it’s a very late 2005 :). The guy I bought it off mentioned it when I looked at it and said if you clean it then it’s fine again for a week or two then start again.

i’m going to try the old MAF later and see if it runs any better, failing that I may buy a new Denso MAF then if it runs better! Just strange how the new sensor caused the car to run worse than the old one.

if not I shall have to get it scanned to see whether any codes come up and take it from there. I’ll probs end up taking the induction kit off again to trial it as well

Did you resolve your issue

Yeah bought a new Denso MAF and put the old airbox back in with a new Cosworth panel filter and she’s run fine ever since!