Advice on my renault clio III rs 20th edition

[phill94]

Hello guys
I have a problem with my Renault clio 3 rs 20[SUP]th[/SUP] edition.I have fitted a free flow exhaust system and I have removed both catalysticconverters and I fitted a cat fooler. When I did this there were no troblecodes found on the bosch diagnostic machine, But when I took it for a drive Inoticed that when I accelerated from a still position at full throttle therewas a flat spot or a mifire and then after that it accelerated properly. Idrove a for a day and it still happened. So I removed the cat fooler and putthe lamda sensor back, but it still has the same problem. Could you maybe giveme advice on what could be the problem or if you have a solution for this.

Thank you.

 

[aucky]

Mk3s get a flat spot with a decat. A remap will help someway to smoothing it out.

 

[phill94]

Mk3s get a flat spot with a decat. A remap will help someway to smoothing it out.

My Renault Clio has already been remapped before I removed my cat. And the flat spot only happens when I pull away in full throttle.

 

[phill94]

Do you think I should use the cat footer or should I remove it?

 

[MG cup]

My Renault Clio has already been remapped before I removed my cat. And the flat spot only happens when I pull away in full throttle.

"Remapped before I removed my cat" is the clue in that statement.

 

[Dan@SJM]

It's needing another map to sort the flat spot

 

[phill94]

I jst did a remap today on my car and the slight missfire when acceleration from a still position at full throttle is still there. Maybe the back pressures are not right since the cat and exhaust resonator were removed.

 

[Dan@SJM]

Was it a generic map? Or custom?