IRock

Can someone tell me what these are and how much it costs?

S@m

If you do a search you'll get more info than know what to do with )

Briefly the Maf is situated just after the air filter box and detects air flow into the engine, costs about £70 for just the sensor or £250 if you get a dealer that wants to screw you )

Mark.

IRock

How do you know when the sensor is failing

richiewong

For fault codes and how to check them look here Clicky
MAF=fault code 23

P_caley

When my air sensor went it cost me £120 to get a new one, bargain as they wanted near on 250-300 for the complete until. Knew it had gone as when the car was idling the revs were up and down like anything between 0-1000, almost like it was having trouble breathing!

greasemonkey

IRock, the Check Engine Light unfortunately won't indicate a failed MAF sensor until it's totally knackered, and normally, by the time it gets that far, it's had plenty of opportunity to inflict indirect damage upon your pride and joy's reciprocating parts.

If you suspect it's failing, you'll have to detect it by indirect means, and unfortunately symptoms that could be a failing MAF sensor could also be other things.

The first sign of a MAF sensor failing is often inexplicable changes in the air-fuel ratio (normally they go lean). So if you have an AFR meter or KnockLink and these are giving you unusual signals, rule out the MAF sensor first.

The other readily noticeable symptom is often rough and uneven idle. As the ECU can "learn" its way round failing sensors, try a reset to get rid of any learnt behaviour, then if you suddenly find it won't hold idle comfortably, again, a new MAF sensor element would be a good first diagnostic step.

IRock

the car sometimes, only when pulling off in first judders initially. then its fine can you help

IRock

I've heard this is called clutch judder and not the maf sensor - any comments

nom

yep

IRock

does anyone elses do this?

NelsonUK

Yep I get the usual judder when I first pull off - especially from a stand still. Much better though when the car has warmed up properly.

greasemonkey

IRock, it's not hard to tell clutch judder from engine hesitation once you know what you're looking for.

Next few times you pull away from standstill, make sure to feed the clutch in nice and gently, and similarly gentle on the throttle.

If you feel judder through the pedal when pulling away like this, odds are it's the clutch. If it pulls away smoothly with no judder/****** as the drive takes up, the odds are what you're experiencing is caused by the engine itself.

Incidentally, if you do decide it's the clutch, you can normally sort it out with an enthusiastic standing start or two.

Gidney&Knowlesy

I haven't seen anywhere what year car this is for 99/00 you can buy the internals cica £80 though for all other years its the housing unit itself you buy and they go for anything between £250 -£350 (depending on UK/Jap spec and availability etc)

IRock

grease monkey, have you had this problem with yours.

Incidently it is the clutch. I've heard that by changing the spark plugs it helps.

I dont want to be buying a new clutch, is there any way to sort it out. (Yes it only happens when she's cold.)

Thanks for the info.

greasemonkey

If you've got a problem with the clutch, changing the plugs isn't going to make the slightest bit of difference!

Yeah, it gets a bit like that every now and again, invariably when the car's just been used for short trips around town for a few weeks. A standing start sorts it out completely, as per post on the other thread. Smooth as you like for weeks afterwards.