Plane mad Harry

Hi, my 52 plate wrx bug has started over revving when changing gear, when I'm accelerating to about 3-4 k revs and change up/down and lift off the throttle the engine revs up an extra 300+ revs when i put the clutch in.
Any ideas.
Thanks in advance.

jason73

Mine does the same

Plane mad Harry

Hi Jason, hopefully someone on here will know what causes it and will come up with a solution. 👍

crazyspeedfreakz

iTrader: (92)

I would be interested to no what causes this also...

I haven't done much in terms of engine mod work on my spec c 03 but I was pulling in to the petrol station the other day I dropped the clutch as I was coming to a stop and it starting to over Rev for about 2/3 seconds then dropped back to normal.... Never done it before... Then a cupple of days later I was moving slow in second, revs at a reasonable level and it started juddering I'm sure the two issues are related...

I was sure it must be clutch related but would also like to no what causing the over Rev...

jonnyboy82

iTrader: (10)

I'm having this problem too it's been diagnosed as the ICV for me.

crazyspeedfreakz

iTrader: (92)

Have u change the icv and issue solved ?

fumbduck

iTrader: (1)

Snap , I thought it was me mistiming the change . Mine doesn't do it often , maybe because I don't drive it often although its definitely there .

crazyspeedfreakz

iTrader: (92)

I thought when the icv went it sort it just didn't idle right, mine idles fine :/

jonnyboy82

iTrader: (10)

Mine over revs when accelerating and on idle if I tap the accelerator it sticks and doesn't fall right back down again.

I have a used replacement ICV on order as a new one is around £200+ so I want to confirm that's deffo the problem before I buy a brand new one.

crazyspeedfreakz

iTrader: (92)

Well I've decided the first thing I'm gonna do is clean the Icv, the 2 screws are a pig to get off but found a little technique and they came straight off...

Icv now removed, just ordered a new gasket as the old one mis shapes as soon as you take the Icv off... And will give it a proper clean up with some carb cleaner... And then see what happens once I put it all back together....

Plane mad Harry

Hi, I've got a new gasket, its the rubber one and cost £6, do you have to bleed the water system after replacing the icv to get rid of any airlock's.

crazyspeedfreakz

iTrader: (92)

I havent seen anywhere that says it needs beading, tbh only a small amount comes out, just put some kitchen roll on top and bottom and un do the screw slowly once there free just do it saves the coolant going everywhere, just put it all back together with the new gasket in place,

I did read that it's best to take it for a drive off boost to allow the gasket to settle properly then check it for leaks, then take it for another drive with alittle boost and then again check for leaks again.

jonnyboy82

iTrader: (10)

No not necessary.

crazyspeedfreakz

iTrader: (92)

Thats what I should have said but gave the long answer lol

Raceface_13

Mine does the same. Would love to know what causes it. Keep us posted
Thanks in advance

ZANY

Could it not be a mapping issue? Just a thought

jonnyboy82

iTrader: (10)

Somebody else I have spoken to about these syptoms did say once they had their car mapped the issue went?

crazyspeedfreakz

iTrader: (92)

Had mine mapped approx 7/8 months ago has been running great since, this has come out of no where !!

jonnyboy82

iTrader: (10)

Ok, well once I have my replacement I will update.

jonnyboy82

iTrader: (10)

So just to update the replacement (used) ICV has made no difference I still have the same syptoms. Now im baffed? Cant really see what else it can be?

rogos

The only time mine overruns is if i mistime my pedals or if i short shift as the engine starts building its power.

madscoob

iTrader: (3)

try cleaning the throttle body out with carb cleaner, if its carboned up its possible its making the icv over compensate as the revs drop when the throttle butterfly valve doesn't shut properly because of the carbon

jonnyboy82

iTrader: (10)

Already done this fella.

just me

iTrader: (3)

A jdm bug I had used to do this, about 8 months later the clutch started slipping, new clutch and it stopped.

jonnyboy82

iTrader: (10)

Got a feeling this is the definitive answer although I hope not

mazbow

Mine has done it every now and then since I bought it and had a new clutch and flywheel fitted 2 months after and it still does it.... but I have found it stops or seems to stop once it gets nice and hot

jonnyboy82

iTrader: (10)

Just to update those who were asking I had it confirmed by my scooby guy and the clutch is slipping

So it looks like an exedy pink will be on order.