Hi Guys, hope you can help!

 

I recently noticed that my vrs was misfiring on idle, only very slight but it was there. Checked the fault codes and noticed it was suggesting an intermittent misfire. 

 

Everything I checked, (plugs/coil pack swapped over  etc) seemed to suggest that it would be an injector at fault. This was changed but the misfire still remains. We also checked the compression and it seems to be all over the place, 2 cylinders (2 & 4) seem to be on the lower side. 

 

Any idea's on what I could check going forward? Or is it time to get the head off and see whats going on? 

 

The car is a 2013 CTHE engine code. I'm a little stumped!

Hello Dipesh, welcome to the forum.

Please can you post what the compression readings were - did you take both 'wet' and 'dry' readings? If there are significant differences between cylinders, this will most likely be the cause of misfiring - possibly from plug fouling - what did the plug electrodes look like when you removed them?

Thank you

 

Tests were done dry. 

 

1 - 180 psi

2 - 110 psi

3 - 200 psi

4 - 110 psi

 

Plugs looked fairly normal brown sort of colour when removed. Not burnt like what i've seen when searching. 

Check the coilpack wiring are you just getting a missfire on one cylinder ? Also did you pull the fuel pump fuse when compression testing 

Edited 14 June, 20232 yr by thomasaspin

When compression testing did you keep all spark plugs in and take one spark plug out at a time and compression test 

Did you stand on one leg with the gauge touching your nose and take the reading with crossed eyes?