coleyswrx

hi my car developed a misfire so i changed the plugs checked the gaps to 0.65 changed the coil packs and it is still misfiring so any other ideas the cel light is also now on

myblackwrx

iTrader: (1)

1st thing to do is read the CEL code (Scoobypedia | Trusted knowledge for everything Subaru | Scoobypedia browse tells you how) and see what that says.

coleyswrx

right done that its giving me 2 long 1.3 sec pulses and 3 short pulses anybody have an idea?

myblackwrx

iTrader: (1)

23 Mass Air Flow Sensor Circuit (it's on scoobypedia under 'subaru specific trouble code definitions')

coleyswrx

Is there a way to clean the maf?

myblackwrx

iTrader: (1)

Do a quick search on here as it's been covered quite a few times but i gather you spray brake cleaner on to the element iinside the MAF.

funkyspider

If the MAF is sending data causing a CEL then I'd be looking at changing it rather than just cleaning it. If it's a MY99 then change it anyway as they were a particularly bad year for MAFS.

coleyswrx

tried spraying it with brake cleaner but no luck, its a my93 wrx sti, the maf has a green label on it ive been told its the expensive type, just my luck, oh yeah the car wont even keep running with the maf plugged in and when its out its lumpy as hell so i guess i know for sure its the maf now

DrSmith

I had a similar prob on my STI RA. Turned out to be dry solder joints inside the MAF box. Four wires if I remember correctly. Resoldered, silicon sealed the box - working fine ever since!! Check this first - may save you some coin.

coleyswrx

ok thanks will try this shortly

coleyswrx

opened up the maf top all was well so bought a new 2nd hand one on flea bay just waiting for it to turn up also today cleaned the idle control valve with some carb cleaner was well grubby inside full of carbon deposits but i guess i wont get the benifits of that until new maf is installed. Would i need to reset the ecu before starting the engine with the new maf installed or will it be ok? Whats the best way to reset the ecu by draining it or by connecting the green and black connectors under the steering column and doing it that way? Cheers.

myblackwrx

iTrader: (1)

You can do it both ways tbh it's up to you (don't think one is better then the other).
Not too sure about a 2nd hand MAF tbh (but depends i suppose on how much a new one is for your car).

I hope you get it sorted

coleyswrx

a new one is 345 quid so will try this first lol, then have it diagnosed properly its just that i dont wanna drive the car running lean to the garage and hopefully this will be ok

myblackwrx

iTrader: (1)

£345
I can see why you bought a 2nd hand one.

Spyd

New MAF is £311 inc VAT. How do i know? Ordered one yesterday

I'm having the same problem and after a month or so decided it was the only option.

wrxsti280

iTrader: (6)

rubbish, roger clark motorsport 258 quid all in delivered, i bought one about 3 months ago

coleyswrx

cheers for that will give them a bell if this 2nd hand 1s no good as it only cost 35 quid thought it was worth a shot, if only to get me safe to garage. cheers