Afternoon all just after some advice, every now and then when sat at a standstill the revs drop then pick back up then drop then back up and so on the car drives fine but this is really bugging me any ideas what this could be . I have unplugged the MAF while the car is on idle and it cuts out so it is not the MAF (right) not to good when it comes to car mechanics but can't think what else it could be just after some advice before I take my little baby to a garage or can I fix this myself. Help please guys and gals

 

Anyone!

 

Hi
I had the same sort of problem before, in the end the car started to cut out at standstill, changed the MAF and it was sorted.

 

is the revs hunting? up/down etc. this could be an air leak from somewhere to

 

No they drop then back to normal

 

Just to let you know, I have exactly the same problem, standstill the car is fine, but drive it a bit and then stop the revs drop then flick back up, MAF has been changed, idle control valve changed, cleaned TPS, changed lambda, checked for air leaks best I can but still no joy - reset the ECU loads of times after each change as well! - its a 1999 sti type R with a sensetive maf

Gonzo what year is yours ?

I am quite certain its to do with the air flow, and im gonna change ECU wit no MAF from JGM, unless there is something else i can check

 

UK Classic Turbo 2000 (W reg 2000) M8. As said not very good with the Mechanics but for the life of me can't think what it could be as the car still drives and boosts normal.

 

mine is the same, drives and boosts perfect, just when I come to a stop, it drops then flicks back up, i cant think of anything else, to do to solve it. The fact that urs is a 2000 makes me even more certain its MAF - air flow related, cos they are really crap with their feeble MAF's, but I changed mine but its still doing the same

 

Can't be the MAF can it because when I un-plug it while it is at standstill it still cuts out or am I wrong and it still could be the MAF.

 

I've got the exact same problem on my97 sti ver3. Drives perfect but when come to a standstill revs drop then pick up, does this for about half a minute then settles. Worked on the car all day today, Checked lambda fine, maf fine, Idle control valve of my m8's car still done it with that so mines is fine, checked for leaks could not find any, no ecu fault codes either. Really bugging me too, Maybe one of us will find the problem then cure us all lol.

 

Or one of the experts from Zen, Mocom,Scoobyclinic to name a few on here or one of the mappers can give us any advice as to what the problem might be or is that wishfull thinking hope not

 

We can only hope! Or bite the bullet and take it to a specialist near by?

 

No specialists near me mate in South Wales.

 

that was my next option cleaning the throttle control valve. mine does it sometimes but its not as bad as you guys

 

Any experts out there with any ideas

 

Anyone?

 

idle control valve??

 

If you've ruled out the MAF, then it's very likely it's the O2 (lambda) sensor.

 

Is there anyway to check if it is the idle control valve or lambada sensor if so where exactly are they located on the car and how much around are these parts to replace.

 

I had the same problem and it was the Lambda sensor.

What does it start like from cold ?

Mine struggled to start from cold and the idle was up/down all over the place.

Having a PowerFC I checked the voltage from the Lambda sensor and it was dead,fitted a Bosch LS02 universal sensor and it's perfect now. Cost me around £40

 

Depends if I let it warm up then settle on the normal revs she is fine until I give her some beans then the revs start dropping at standstill back to normal drop then back to normal etc. I can't really jump in a drive off straight away also if I'm in gear normally 3rd or 4th and floor it the revs jump but she doesn't pull for a split second then bang she's off.

 

It could well be the Lambda sensor mate.

 

does sound like that. with mine, when i drove the car steadily from cold, accelerating gently through the gears the car was horribly lumpy, but once warmed up, not too bad, but still hesitant. i decided to change the lambda sensor and had a genuine subaru jobby put in. expensive as from a dealer, but piece of mind. that helped a little, but after inspecting the i.c.v. it was smutten inside with all gunk. so had a second hand one fitted and clean it out every couple months with brake/clutch cleaner.

 

Thanks guys how much is a new Lambada sensor and where in the engine bay exactly is the idle control valve so I can clean it

 

£118.14 genuine subaru. got one last week befor re map, best to get that one as cheeper ones aint that good and dont last as i found out.could still be maf cos i unpluged mine to cheak it as it too was hunting up and down it too stopped engin but went to mappers and got it all hooked up to find high readings on the maf so it was a trip to subaru today 77.00 quid +vat and standard pannel filter (sick of buying them now) threw k&n in the bin back to mappers and its pulling now vf35 wizzing like a gud un

 

May i also jump on the bandwagon as im havin the same problems.however its going to re motorsport next week so they shud hopefully figure it out

 

Post the outcome for us m8 as I can't take mine to the garage until a week tuesday due to work commitments.

 

Same thing on mine but only when the air con is switched on. Has also stalled when using full lock...presumably it's somehow linked to power consumption?