diagnosis needed! - C3 suddenly lost power.

Hi all hoping someone can maybe shed some light on a problem that currently has stumped three mechanics! I have included as much info as I can but honestly my knowledge about cars in general is pretty basic.

A few days ago I was driving and the car suddenly lost power. Th cars turns over ok and runs in idle fine but when you hit the accelerator it starts shuddering and does not rev. Everyone seems to agree it is not running on all cylinders but the problem is everything seems ok. There is no engine management light and it as been hooked up to check for codes and there are no codes coming back re any engine fault. The electric diagnostic seems to work though because I have a brake light needing replaced and it does sense this.

So far we have tried changing ignition coil and spark plugs no change. Also it does not seems to be an issue with the fuel as I filled up two days prior and had been driving after this no problem. There has been no warning at all.

If anyone has any ideas to help I'll try anything

Thanks in advance

Hi gwc3,

I would suggest taking it to a different garage for diagnosis. Maybe one that understands the C3 better?

If there are genuinely no codes stored then you have a mechanical problem and a mechanic will be better placed to fault find because they will have the car right in front of them and can even drive it.

Hi
sounds like throttle position sensor/ body fuse and/or relay. Have you tried that?