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[mituc]

So I have the same problem. I noticed it only happens if I accelerate (in any gear) at part throttle (like half) after the engine cooled down or within the first like 10-15 minutes after a cold start in the morning.

The problem started in the summer and I thought there's some table with boost limits versus coolant temp (as we know during hot summer more boost is necessary to achieve the same load/air flow at a given RPM), since the problem started after a remap.

I think now I have Denso VXUH22I, do you guys recommend something else? NGK 6645?

[CrazyG]

Totally the wrong plugs !

Check out the list in the 'table' in this post for a selection of
the correct plugs that you should fit in your Brabus.
http://www.forfour.co.uk/forum/index.php?topic=612.msg5240#msg5240

[gregk2]

I use NGK Platinum ILZFR6C-K

[mituc]

Totally the wrong plugs !

Check out the list in the 'table' in this post for a selection of
the correct plugs that you should fit in your Brabus.
http://www.forfour.co.uk/forum/index.php?topic=612.msg5240#msg5240

Ok, I had the Denso IKH20, the wrong part# was only on the order and invoice but the actual spark plugs in the car were these.

Any word on the gap? I think they come pre-gapped at 1.1mm, is this right for a turbocharged PI engine like this? I know for sure that gapping them at 0.8mm will make the car run like a wet mule, so that is too small.

Thank you!

[CrazyG]

Slap them in straight out of the box, the gap is preset and correct.

[mituc]

Replaced spark plugs, problem solved. The gap on the worn spark plugs was well around 1.5mm, other than that all looked perfectly.
Thanks guys!

[Problemchild]

Another thumbs up for the contribution of our members who make this site awesome

JJ