Miss and backfire issue

[scotiamr2t]

After my last trackday I developed a missfire which also results in a backfire.

Being a track car I have general spares so the following parts have been changed as a process of elimination.

Coil pack, plugs, leads
Idle control valve
Lambda sensor
Injectors

The problem is still there! I have compression tested the engine an all figures are healthy. Any suggestions? Before I book it in to go on clip

 

[da rok]

have you tested to make sure all the injectors and coil packs are firing / getting signal? could be a loom problem

 

[scotiamr2t]

have you tested to make sure all the injectors and coil packs are firing / getting signal? could be a loom problem

I certainly have, called my local renault specialist this morning and after a discussion we believe it to be the crank sensor at fault. I have one of these ordered an to be collected today so hopefully should resolve the issue

 

[scotiamr2t]

well after further trial and error and replacing the crank sensor the issue remains so need to have it plugged into clip! unless anyone has any further suggestions?

 

[da rok]

yea crank sensor wont cause a miss, will either run or it wont, i recon you need to go through the loom and make sure all the earths are good and clean, bad earths can cause a host of problems...

 

[bloke]

yea crank sensor wont cause a miss, will either run or it wont, i recon you need to go through the loom and make sure all the earths are good and clean, bad earths can cause a host of problems...

Had plenty of crank sensors give misfire.

 

[da rok]

Had plenty of crank sensors give misfire.

never come across it personally, and it seems its not the problem in this case...