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[megaomega123]

Firstly, sorry it's not an omega. I switched allegiance 4 years ago!
Had misfire on all cylinders about 4 months ago  (z32se)
Suspected cam cover gaskets and was correct. Fixed that and all was good. Still have an oil leak from don't know where.
All of a sudden the car started running rough, eml on and codes said random misfire p0300 and misfire on all 6 cylinders. Also had p0156, lambda sensor. I do have a blow in the exhaust at the front flexi, after all sensors.
Checked cam covers and plug wells, bone dry. I also changed the coil packs when i did gaskets.
I'm at a bit of a loss now, any ideas???

[Marks DTM Calib]

My money would be on the MAF, can you check live values?

The fact your getting a miss fire on all cylinders and the Lambda code is present also points towards the MAF.

[megaomega123]

Can't get live data. Would unplugging the maf make a difference? Reverting it to basic standards?

[megaomega123]

Idles slightly better with maf unplugged but still misfires everywhere!

[Marks DTM Calib]

It will as the learnt values will be a mile out, the fact its improved points you in the right direction, try resetting the codes then running with it unplugged.

Do you know anybody with a 3.2/2.6/2.2dti who you can borrow the maf from to prove?

[Marks DTM Calib]

I am assuming you have checked for air leaks?

[megaomega123]

 Don't know anyone to swap out with. Just in the process of resetting codes and try unplugged maf.
Just taken out air box for a check, all ok. Oil leak looks to be near crankshaft pulley!!!
Checked air leaks and electrical connections as far as possible.

[megaomega123]

No change after reset and with maf unplugged!!

[megaomega123]

Just had inlet manifold off again to check and double check everything. Nothing amiss and still really bad misfire on all 6 cylinders:/

[TheBoy]

Probably does need live data looked at, if you think its not MAF.  Where are you, maybe a local member would be willing to get live data for you

[megaomega123]

I'm near Auchterarder now, will be Ayr in a few weeks.

[megaomega123]

Could the misfire be down to inlet manifold gaskets? They look a little flat. It seems air leak is most probable to misfire all cylinders???

[megaomega123]

I've done the carb cleaner check, which showed nothing. Just done a smoke test and it seems tight as a drum.
I'm leaning back towards the maf now. It does seem to even out when the maf is unplugged.
Is it normal for traction control to switch off when maf unplugged?
Is there any real way to test a maf other than trying another one?

[megaomega123]

Reset ecu and did 5 miles with maf unplugged.
Eml flashed the whole time. Very down on power ( notice that cylinders are missing).
Following codes after run: p0100 maf. P0110 air intake temp. P0300 random misfire.  P0303 misfire cylinder 3
Maf unplugged explains p0100 and p0110.
Should it still misfire with maf unplugged?

[megaomega123]

So, I've just changed the maf, no difference. Then changed both coil packs, no difference!!!
I'm a bit lost as to where to focus now. Really need some help with this