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That's disappointing

^ this is how I do it. It’s probably your foot positioning which is making it so difficult.

Looks like a 197 piston to me

Sad times really. Makes ya wonder why they even bother ‘owning’ the site. I can’t see that sub fees would amount to much. There’s barely any of us left.

Looks like a standard 197 piston to me. What is it you’re trying to accomplish? Is it an uknown replacement engine?

I can’t tell you that. The piston could belong to any of the engine codes in the above table. The engine code on the block would give you more of an idea

It’s a standard piston, of size B

I’ve got a 197 box in pieces which you could switch all your internals into if you are struggling.

Could also be the alternator, AC pump, or tensioner. Removing the drive belt will confirm that it's either of the, but won't help you single out the issue.

Fair point Beany. Would make a wicked replacement for the Megane.

Put in the gearbox with no LSD and hope that it does actually work - I'd use this option as Plan B Put in the second gearbox if the Gripper can be easily moved and dropped in - It's not a difficult job, but doing it right means new diff bearings and shimming it correctly to get the preload...

Ok. Well good luck

Vacuum leaks are not common. You can try spraying brake cleaner around the pipes. If there’s a leak, the revs will change. I already advised you that it is likely to be your lambda sensor.

I you’re 15 years too late to be asking Renault to step in and sort it. To me, it seems like you have 2 viable options. 1, learn how to drive around it 2, get an aftermarket remap

You'll know. They do get progressively worse, to the point where they refuse to change gear quickly. All depends on use and how you drive really.

Some of them can be a right pain. You always run the risk of doing the same again. You can buy them separately. But are very expensive

You can check to see if the voltage is pulsing, but that doesn’t really tell you anything.

Mine was lambda sensor when it started running rough on idle. There were no codes.