akshay67

My MAF has gone up the creek and needs replacing. Given that these are quite flimsy, can you get some stronger after-market ones? Or is the OEM Subaru part the only version?

While you're at it, what's the part number?

JJay

Part number is 22794AA010 - Meter CP Air Flow

Can anyone offer any hints/Tips on fitting this. Does the ECU have to be reset after replacement?

akshay67

Mate, fitting is very easy, need a torex type key - remove the block of pipe the MAF connects to and unscrew - I'll take pics when I do it. Just be careful not to drop or touch the element as it is flimsy.

Yes, the ECU needs to be reset.

pedro72

Just had mine replaced last week. Much healthier and less trips to shell. How do u reset e.c.u.? have not done so yet

SlowBoy

iTrader: (1)

Pete,

I'm sure Angie will have carried out all the necessary procedures when he fitted it mate.

pedro72

i'm sure he will have. if it wasn't reset i guess i would know aboutit. wot do u think about group buy slowboy? numbers stacking up nicely!
cheers buddy

pete

akshay67

Group buy on ECU Resets? Hmmm....

But seriously, just disconnect the battery for an hour or so and reconnect.

I'd recommend a periodic ECU reset to anyone in light of my experience last night re ECU exchange...(see thread in General Technical)...

messiah

need a new maf myself. is that part code for a genuine subaru sensor or a different one available from partco or somewhere similar?

SlowBoy

iTrader: (1)

Pedro - lots of takers for the group buy (exhausts), well done. Looks like a popular upgrade!

Messiah - genuine part from the dealers or specialists. You need the part number so they don't try selling you the whole assembly which is a couple of hundred quid, instead of £70 odd.

akshay67

5low/Pete,

Does that guy in Park Royal sell the MAFs?

How much did he charge in total?

Cheers!

Isn't it ironic when I said on Sunday that I've had no problems with my MAF

greasemonkey

Famous last words!

richiewong

MAF's cost about £75 for MY99/00, part No as JJay mentioned.

ECU reset and codes

allymac

I was advised in the past to ditch the MAF from my MY99 Impreza Turbo and put in the item from the MY00 car due to the MY99 being crap.

I know Imprezas are terrible when it comes to mpg, but could a new MAF help improve them somewhat. My car is standard except for a Scoobysport middle pipe and back box.

What are the differences between the MY99 and MY00 MAF? Is iworth spending the 70 sheets?

Thanks,

Ally

nom

?
No difference between the MY99 & MY00 MAF AFAIK, but any new MAF for the last, ooo, 9 months or so is of an updated design, which is much tougher. If you have the older design, £70 to change to the newer one could save you an engine so yes, it probably is worth it!
To check whether you have a new or old MAF, there's a couple of things you can check - one is the newer one has a blob of paint on it (either that or a different colour of paint to the old one - can't check, don't use a MAF ), and also the newer one only has 4 connections rather than 5. At least I think it's 4 rather than 5; certainly it's one less...

Economy can frequently be 'fixed' by replacing the lambda probe. They are only good for 3 years/30,000 miles, and after this point will start to read in a way that makes the ECU run rich at cruise. The lambda probe governs fuel at cruise, the MAF under load, and the MAF fails to run leaner (rather than richer like the lambda), which is why it causes blown engines...

pedro72

Akshay67, got mine from Gary at Subaru(isleworth)[02085681414] then took it down to Angie. They said they had plenty in stock. Hope this helps, and by the way loved the noise in Hanger lane tunnell on Sun!

Pete

pedro72

Forgot to say. angie charged me £30 but that was after giving it a good once over beforehand with the old emmissions test. Car is running much better

pete

akshay67

Cheers guys...looks like I will have to get the MY00 one (I have a MY99, but want the newest one possible)...Pete, you don't have the MY00 MAF part number handy do you?

Yep, the sound in hanger lane tunnel was awesome - pity the car wasn't warmed up enough as a pop and bang would have really added to the factor!

pedro72

Pretty sure the part no is 22794AA010 - Meter CP - Air Flow, but not 100% sure that is for MY00. Has it got worse since Sun?

Pete

WREXY

That part number is universal for MY99 and MY00s. I believe the old stock has finished and the new ones are being served now.

Cheers,

George.

akshay67

Just did a bit of research and found out that Subaru did a recall on the older MAFs in the USA - nice of them to do it here too!

Pete, I noticed the problem on Monday night when I upgraded my ECU (this process caused a reset, which cleared the compensation that the ECU had learnt which masked the problem) I didn't really drive for too long with the way the revs were acting - not nice at all and the car almost ground to a halt when slowing down.

I wonder how many people have suffered from blown engines due to not knowing the MAF was failing? I think Subaru would have something to say about this.

Although I have no monitoring on board (delta dash on way ) - I definately noticed that my car was progressively getting faster and faster - a tell-tale sign of it running leaner (or maybe the colder weather?), which is what one would expect from a buggered MAF. It was only a matter of time before things would have gone pop methinks.

nom

IMHO the MAF is the main cause of blowing engines (other than 'cowboy' mappers who effectively cause the same problems albeit by a different method - fortunately there aren't very many of them around any more!). The ECU can cope with a wide range of circumstances beyond what the car comes with 'out of the packet', as long as it's fed the right information...

Glenn Coombs

I've just had my MAF replaced after it died and haven't noticed any change at all in my fuel economy (still 24 mpg). Most of my driving is on the motorway at between 3000-4000rpm. I was expecting to see a drop in economy after getting the new MAF. Is fuel economy at motorway cruising speeds more likely to be governed by the lambda probe than by the MAF ?

If so that would explain why my economy hasn't changed. It also means that a new lambda probe might even improve my economy a bit.

How much is a lambda probe and is it worth getting a new one for my MY99 in the hopes of improving the fuel economy ?

akshay67

'How much is a lambda probe' - £25 from Halfords.

Someone said they start naffing up after 3 years/30k miles...

Glenn Coombs

So they're not hideously expensive then. But is it the lambda probe that is responsible for controlling fuel economy at motorway cruising speeds ? Or the MAF ? No point replacing it if it isn't going to have any effect...

pedro72

Akshay67, have done approx. 280 miles to a tank of Opti so not too great a difference in the fuel economy but the car is much happier about life. Which ecu upgrade did u go for?

Pete

akshay67

Went fot TEK2 - will do some back to back tests with original ECU and post results tomorrow (subjective of course until I get on the rolling road!)

Did you notice a big difference between yours and Rich's car? (bet you can't wait to get your downpipe!) Have you considered heatwrapping it?

pedro72

Hdn't thought about heatrapping it. Benefits? Rich's car sounded fantastic compared to mineand pulls noticably stronger. All going well should have the d/pipe fitted by next week!
Good luck with the MAF

Pete

akshay67

heatwrap, keeps underbonnet temperatures down - it is effective as you can even touch it after a spirited run (try that without!). Of course this will raise the heat of the downpipe metal, which is no bad thing as you'll get more pops and bangs...

I can't say you'll notice a big difference in performance though!

Are you gonna do the back box and centre-pipe too? I'd be rude not too

pedro72

Just the d/pipe for now. Going to sort centre and back in '04 as i'm on a tighter budget than u! The wrap sounds good, is it easy to fit?

akshay67

I've fitted the new MAF. There is definately a visible difference between the old and new metal films, as well as other things.

Centre section is only about £50-£60

Mine came with heat wrap - but no required skill to fit (you could even ask the missus - get her into the scooby thing too ) - just wind the fabric around the pipe and put some metal cable ties on the end.