Ver.4

My revs keeping fluctutating rapidly to about 600 - 900rpm when it is idling, does anyone else have this problem or have had it, any help is greatly appreciated.

STOOBOY

iTrader: (5)

Fooked MAF sensor most likely cause!

MrDBM

MAF could be likely, have you noticed any fluctuation in fuel economy lately, perhaps more miles to a tank?

AFAIK the MAF degrades over time, so it's difficult to assess whether it's actually failed or not. If possible, the best idea is to try a new (or newer) one for a quick drive, and see if that helps.

Failed MAF can cause serious damage is left unchecked for some time, if you can, get it swapped, particularly if your car is +3 years and on it's original sensor.

richiewong

Sounds like MAF.....................or Lambda

Ver.4

no fluctuation over miles to the gallon, it doesnt happen all the time, just perhaps once or twice a day. Ok, i will have to look into it, thaniks

Ver.4

What an idiot, i missed the most important bit! It only does this when i turn my lights on, so is it a link with battery power or something? thanks again !

maci

iTrader: (3)

I was just going to say that bad fuel and dirty injectors can cause this too, but if it is only when you turn the lights on then it cannot be maybe the battery is dying or your alternator is not working properly. Is it also doing it after you drive it and then turn the lights on ?

Ver.4

yes, when i first start the car it idles perfectly, as soon as i turn the lights on they drop and keep fluctuating. I drove around for a bit and then pulled over and turned m lights off and it idled normally.

STI Craig

i had a similar problem to u bud.

lucky for me my mate has the same spec scooby we tried switch ing the maf and we got no change then we changed the idle controll valve(solenoid that sits on top of the engine and is bolted to the inlet manifold(its a 2 part thing)) and the problem was cured!!!!!!!

good luck bud hope u find the problem !!!!!!!!!
maf sensor can be £100-200 depending on year of car
and idle controll valve £280

but i got one from grade a subaru for £45-------RESULT

chriswrx94

sounds electrical to me, sounds like ya need to have ya alternator/battery checked out especially if you like ya tunes in the car, depending on the age of car the wiring between to components can deteriorate over time, if not maff sensor or lamda probe possible......hope this helps

tershman

iTrader: (1)

The part is the gasket between the inter cooler and the pipe that feeds it PART no 21896 If you buy this part take lots of care doing it..

Try this mate seem if it works