Clio 182 Running Issues

[Woodentop]

Really hoping someone can help me, I have been in contact with Renault specialists local to me but they are booked up until October.

Little back story, I had a poor running car (hesitation and felt like it was cutting out) but I changed leads, plugs and coil pack and that seemed to help for about a month or two but now I have a new issue where it feels like a misfire. The symptoms are most noticeable around 2-3k rpm and the revs seem to drop briefly and return. Under full load it seems ok? Or it could just be less noticeable.

I have since changed the map sensor and checked all the leads again, just incase one was caught when I put the manifold back on.

The exhaust does seem to have a bit of a rattle, and maybe a small leak as the exhaust fumes are quite strong at idle.

Has anyone got any ideas on what this could be? It’s my daily car so I am a bit stuffed without it but it’s scary to drive at the moment.

 

[Mertin]

Injectors can cause a misfire, ones Iv had go the misfire is there all the time so was easier to diagnose by disconnecting one at a time and seeing if engine changed. If no change then that was the culprit.
Maybe a bit harder for you if it isnt there all the time.
Other way to check them is with a multimeter and measure resistance

 

[Woodentop]

Injectors can cause a misfire, ones Iv had go the misfire is there all the time so was easier to diagnose by disconnecting one at a time and seeing if engine changed. If no change then that was the culprit.
Maybe a bit harder for you if it isnt there all the time.
Other way to check them is with a multimeter and measure resistance

I did previously change one injector as it was leaking. Might be worth me changing the others. Is it safe to run the engine with the injector disconnected?

 

[ex-Chinese Dave]

Check inside the fuse box in the engine bay (right side as you look at the engine) There is a large white plug which you can check. I had a misfire and found that it was moisture inside this plug. I dried it out and put some dielectric grease on it and the misfire went. I'd give the fuse box a check over and make sure that nothing else is loose, wet or corroded.