Chasing misfires on driver’s side (4,5,6)

[Quiker]

Turned out that the problem was.... a clogged catalytic converter on the driver's side.

 

[Granelli]

Out of curiosity, how was this determined? Did it throw a code or something else you were able to trace?
Thanks!

 

[Quiker]

I was only throwing misfires on the driver's side bank - 4,5,6 - swapped plugs, tested coils. Then looked at all the hoses and tubes that were hanging of that side of the intake. Once through all that - I was either dealing with a cam/cam phaser issue - or something common to those three cylinders - and downstream. led me to the cat.

If you pop out the O2 sensor between the turbo and cat - I was building pressure there - which led me to believe it was clogged.