Cylinder 6 Missfires under load

**Occ224** · 08-19-2018, 08:32 PM

2008 bmw 335i 90k miles
Combustion Misfires cylinder 6 not sure the exact code i dont remember but thats the only problem. In the morning it pulls very well but when it gets warmed up it will start misfireing under load. Around 9 psi. It wont misfire with stock tune but it with stage 1 tune. It did not use to misfire with stage 1 tune. No extra bolt ons no burble just a stage 1 tune.
Replaced plug
Replaced coil
Replaced fuel injector
Coded fuel injector
Tried to Cleaned the valves in cylinder 5 and 6 as best as I could not to good of a job but enough to have fixed the problem if thats what it was.
Checked my hardest for vacuum leaks
Im stumped..
Help Please

**Old525i** · 08-20-2018, 12:09 AM

Make sure plug gap is set to 0.044 inches.

**Occ224** · 08-21-2018, 09:40 AM

I did. I also swapped plugs with cylinder 1 and it still misfires cylinder 6

**328 Power 04** · 08-21-2018, 09:46 AM

Check the resistance on the dme mosfets that drive your ignition coils.
Is this msd80 or msd81?

I can replace those dme's plug and play.

**NoQuarterX** · 08-22-2018, 05:21 PM

Originally Posted by Old525i

Make sure plug gap is set to 0.044 inches.

That is a huge gap!

**Old525i** · 08-27-2018, 01:35 PM

That's what the doctor ordered.

**relative4** · 08-27-2018, 04:46 PM

Originally Posted by NoQuarterX

That is a huge gap!

That's what he said.

**Codes2** · 08-30-2018, 12:50 PM

Originally Posted by NoQuarterX

That is a huge gap!

Is OK on stock Bosch.
Not correct for NGK 5992 (stage 2), which is .022~.

**XnWarden** · 09-07-2018, 12:34 AM

You said it doesnt miss on a stock tune. So if you want to run stock gaps then stick with a stock tune. Otherwise you should probably step your gap down to a colder one.

Originally Posted by Codes2

Is OK on stock Bosch.
Not correct for NGK 5992 (stage 2), which is .022~.

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