High Idle

[MikeyK18]

My 172 has started idle quite high ever since i took the throttle body & idle control valve off for cleaning.

I sprayed some carb cleaner around the 2 and since the idle revs are revving to 2.5k when stopped and around the 3k mark when braking/changing gear.

ANy ideas what could be wrong? When into my local stealers and they said disconnect the battery for 5 mins :S

 

[Tigger]

Did you try disconnecting the battery for 5 mins, it do anything?

 

[MikeyK18]

No not yet.

Will try it tho.

Any other suggestions?

 

[stewart]

I didn't know a DCi revved up very high (just raking ya)

 

[Cro]

If it hadn't been so late and the wife nagging me mate, I could have plugged the laptop in see if anything came up

 

[mattjk]

you probably got an air leak on the inlet somewhere.

 

[MikeyK18]

If it hadn't been so late and the wife nagging me mate, I could have plugged the laptop in see if anything came up

Aye i know that dude, didnt want to keep youany later

 

[caister]

Did you replace the throtle body gasket? It may be letting a bit of air in.

 

[MikeyK18]

there wasnt a gasket on the throttle body

 

[Coby.]

I'd check for any Air Leaks but if there is it would usually Rev the nuts off the engine so maybe try the Battery Disconnect Route.

 

[caister]

there wasnt a gasket on the throttle body

There should be. I used some silicone gasket sealant to do mine .

 

[Tigger]

That could be your source then Mikey

 

[MikeyK18]

It didnt do it before tho, so i would have thought that had ruled that out.

 

[davo172]

there wasnt a gasket on the throttle body

There should be mate

 

[J-Key]

My 172 has started idle quite high ever since i took the throttle body & idle control valve off for cleaning.

I sprayed some carb cleaner around the 2 and since the idle revs are revving to 2.5k when stopped and around the 3k mark when braking/changing gear.

ANy ideas what could be wrong? When into my local stealers and they said disconnect the battery for 5 mins :S

By spraying carb cleaner into the throttle body you have removed the fine lubricant inside the body.

You need to buy some dry lubricant or silicone lubricant from say halfords and lubricate the inside of the throttle body where your butterfly moves across.. this will allow the butterfly to stop sticking and allow it to move freely, therefore eliminating the sticking butterfly which is causing the high idle.. i know how frustrating it can be lol

I would also recommend spraying lubricant onto the springs which make the butterfly spring backwards and forwards located on the side of the body

 

[Topgeartom]

Mine idled at about 3k when i tried to reuse a nackered throttle body gasket.

A new one sorted it instantly.

Renault part number is 77 00 866 483 Somewhere around the £1 mark. My local stealer had to order it in from france however so took a week or so.

 

[MikeyK18]

Did the revs stay at 3k when braking/changing gear?

 

[Topgeartom]

i didnt actually drive it as as soon as you turned the car on it idled silly high so i didnt drive it.

 

[caister]

If its not got a gasket then go get one from a dealer or make one using silicone gasket stuff. At least that rules it out.

Could also be a sticky throttle cable or return spring on the TB.

 

[MikeyK18]

Had a look at it last night, its the gasket.

Thanks for all the help guys.