high revs when idle
 

hi guys ive got a 2005 wrx, when i first start her up the revs are very high around the 2000 mark when idle, after she warms up they drop to between 500 n 1000.

ive been told by my local mechanic it could be the coolant temperature sensor is faulty, anyone agree with this or could it be something else???

also she is very jumpy in low revs when accelerating!! not sure if this is linked or not??

thanks sam

Don't think it'll be coolant sensor because revs drop, how long as it been like this?, try cleaning the icv with brake cleaner.

ive had the car 2 months now, been like it ever since i got her, im sorry mate this my first scooby!! wats the icv? lol

I had the same problem 2 weeks ago mine was a combination of the Air fuel ratio sensor and the Idle valve......wasnt a cheap fix :cry: But all sorted now!

Any EML?

ok mate thanx. nah no light has come on and ive checked the ecu and no error codes, how much it cost you to fix?? if you dont mind me asking?

Icv idle control valve. On a classic its to the right of the throttle body
Eml engine management light lol.

The icv can be sticky , common problem on classics

£834.93

They had it for a week aswell......£60 for a diagnostic even before they lift the bonnet and start labour charges

ok cheers stedee i will give it a clean, thanks for ur help!!

and woody i best start saving if cleaning the icv doesnt help lol, thanks for ur help too

well this is interesting, as me and my old man both have scoobys, mine being 05 his being 10 both ours idle at 2k until warm, its unusual for them to do it and be a fault with something

Dan

If its the idle air valve control sensor it will put the engine lift on and the code is p1507 I think. This can be an easy fix all is required is for you to clear the sensor once removed. All Subaru cars when started cold will rev high and settle down once warm that's normal. Not sure at what revs though.

You will be better to take it to a independant specialist. They will be much cheaper than the main dealers.

Also worth whole to use the search function in here as it will provide useful info.

2k is a bit high tbh, should be more like 1200 to 1500

Yeah actually mine ticks over at 1500 when cold so yeah 2 does sound high, As supa said go to a specialist garage rather than main dealer

ok thanks guys!! youve all been a great help

I had the same problem with my 2005 WRX and it proved to be a broken idle air control valve sensor - was giving a code reading of P0519 - idle air control system performance - when plugged into a cheapo EBAY OBD2 U480 code reader. Removed it and cleaned the moving parts but the electronics must have been goosed. I got a secondhand replacement from Impreza Breakers ltd for £35 delivered tel 01508 558880 . I bought a new gasket part no 22659AA120 from local Sub dealer for £7 and fitted it on the car in 5 minutes. Problem sorted - high initial idle now back to normal and no lumpy acceleration. Dead simple replacement - see NASIOC for some good pics of IACV -

http://forums.nasioc.com/forums/show...ighlight=P1507


I would suggest buying a code reader so you can be sure which sensor is playing up because high idle and lumpy acceleration could be due to other things too!!!

Sounds like the same symtoms I had. New ages are prone to idle control valve problems especially if not used regularly.

The last copy -I think it was the last one- of Total Impreza had a step by step pictorial on how to repair them.

Did mine without any problems and now it's perfect. (I didn't attach a drill just used my fingers)

Good luck......

Could still be coolant temp sensor. It acts like a choke to inject more fuel when cold. When it warms up its like putting the choke back in. If its playing up at low temps then it could cause the ECU to supply more fuel than usual. Would explain why it sorts itself out when it warms up.

Also try cleaning the ICV too as its not hard to do and as has been said it is quite A common fault.

yes it can be as my old scooby did this on my my98