172 Cup Revving when dipping clutch

[Schweppy]

Morning all

So my shed (nearly 135k miles now!!!) recently had a new injector and since then has been revving itself when dipping the clutch whilst coming to a stand still. This seems to be most pronounced when cold but it is rarely getting warm lately as the drive to work is roughly 4 minutes...

The few other threads I've found seem to point to an air leak...

Here's a vid, clutch pressed fully in at roughly 4k revs.



Any ideas?

 

[dann2707]

Check the O-rings on the fuel rail connector they usually break when removed as they get trapped and split.

 

[Schweppy]

Check the O-rings on the fuel rail connector they usually break when removed as they get trapped and split.

Thanks dude. Renault sell replacements?

 

[Chrisgti6]

I don't know the 172 lumps, but does the inlet have to come off to change the injectors? Maybe an air leak on the inlet if so?

 

[Schweppy]

No it doesn't. Just the fuel rail but cheers for the reply!

 

[homi576]

my 182 has started doing this out of the blue not sure what it is, stops when warm but when cold dip the clutch and rev go up and down between 2000 and 1200 :/

 

[Schweppy]

Reset the ECU with a battery disconnect yesterday. Left it for a few hours and then took it out for a nice hour long thrash. All seems well when warm but defo still doing it on cold start for a good 5-10mins.

 

[Budgie]

Possible vac/air leak would be my guess.

 

[Schweppy]

Possible vac/air leak would be my guess.

Yeh me too. Any ideas on what to look for?

 

[Budgie]

Make sure the inlet manifold is bolted down right.

Make sure the pipe work going into it are fixed..

Other than that, just have a general listen...

 

[Rob669]

Spray around various areas where an air leak could be with brake cleaner and listen for a change in revs = air leak found.

 

[Schweppy]

Had a good listen and can't hear anything but guessing it's something to do with the fuel rail so will have to try and find some brake cleaner out here in Berlin...