The past few weeks, I've noticed the engine running a little rough...sounds like it's eight-stroking on acceleration and the idle is a bit lumpy. The acceleration is laggy too.
So today an engine warning lamp popped up on the dash.
I ran a diagnostic program and it came back with "Fuel Mixture Imbalance". Classic eight-stroking cause....
However, this is a lean mixture warning not a rich mixture warning...so it kind of shouldn't be eight-stroking
However, on inspection of at least one plug the plug is super sooty suggesting a rich mixture (at least on that cylinder...or it may not have been burning at all (poor spark?). The plugs have been replaced and this is the one (#4) that was oily previously
There's quite a clicking sound coming from #4 cylinder too. I'll try and put some video together and link it.
Has anyone else had this issue?
It could be I need to just clean the MAF sensor...or it could be one of the oxygen sensors...or maybe throttle body/butterfly a bit sticky (I had that in a VQ35 engine once before...a bit painful to clean 'cause the butterfly was further back than the length of my fingers...a gynaecologist I 'aint!) or a leaky vacuum hose (which I have no idea what to look for there)
Our local dealer can't see the car until the 22nd of Jan 2020!