High revs/high idle in neutral

Hi all,

First of all, thank you for letting me become a part of the forum.

I have an issue with my C3 (2007 C3 Desire 1.1L Petrol) which I have searched the forum and many other sites in hope of finding a solution but as yet have been unsuccessful.

When started, the car idles at around 2500-3000rpm. I can make this drop back to a much more normal 1000rpm by selecting a gear and lifting the clutch to near bite point but this only works temporarily as the high revs return as soon as the throttle is pressed.

When I set off, as the car starts to move there is a judder, then as the gear starts to engage the revs return to normal. Depressing the clutch means the high revs return until I select another gear.

I have recently taken the car to a local garage and having spoken with the mechanic today, he informs me he "has tried everything he can think of" including testing with a replacement throttle body, however this has not fixed the issue.

I wonder if anyone on the forum has had a similar issue? or knows the right direction to point me/my mechanic in?

Extremely grateful in advance for all your help/advice!

Many thanks
Dan

DanielC3 wrote: ↑Tue May 15, 2018 4:08 pm I have recently taken the car to a local garage and having spoken with the mechanic today, he informs me he "has tried everything he can think of" including testing with a replacement throttle body, however this has not fixed the issue.

Unfortunately, it is a lot easier to diagnose a car when it is right in front of you. Your mechanic will have a much better chance to find the fault than anyone else.

Not knowing what he has checked could just make a list of duplicates and going over everything that has already been done.

The obvious are checking the air intake metering and any vacuum for unmetered air. But I would assume all this has already been done.

Next step would be to connect a diagnostics and read codes and then live data to see if anything shows up after all the engine bay inspections. Use a lexia tool (diagbox) for the full citroen experience, but an OBD2 scanner (here) would be just a good and easier to use for engine codes.

Thanks for the advice.

I do appreciate trying to diagnose a car over the internet with such little information is almost impossible, but just wanted to enquire in case it was a common issue that someone could shed light on.

I have picked the car up this morning and the mechanic explained he has done a diagnostics check but no codes are showing.

He advised me to take it to a Citroen dealership to be checked over which I am in the process of arranging.

Thank you for your reply though and will update the thread when I know more/the issue is resolved.