Minor misfire after spark plug change

[K_style]

After replacing spark plugs (NGK LKR8AP) on my E92 M3, there has been minor misfiring here there that bothers me crazy.

I applied minimum amount of anti seize and torqued to proper spec however I did not regap because it is dual prong plugs.

Does anyone have any possible cause of this?

[W Cole]

Originally Posted by K_style

After replacing spark plugs (NGK LKR8AP) on my E92 M3, there has been minor misfiring here there that bothers me crazy.

I applied minimum amount of anti seize and torqued to proper spec however I did not regap because it is dual prong plugs.

Does anyone have any possible cause of this?

Did you check the codes? If it's throwing one then it will tell you what cylinder(s). I never gap the plugs just eyeball them and make sure nothing look out of whack. Maybe one of the plugs has an issue? I would think any anti seize should burn off pretty easily.

[K_style]

Originally Posted by W Cole

Did you check the codes? If it's throwing one then it will tell you what cylinder(s). I never gap the plugs just eyeball them and make sure nothing look out of whack. Maybe one of the plugs has an issue? I would think any anti seize should burn off pretty easily.

No there has been no code except the very first time when I forgot to plug #3 cylinder coils but fixed that right after.

[AWTT335i]

I would try removing the anti-seize. It will skew your torque reading as well as potentially interfere with the plug ground.

Not saying that is definitely the root cause of your issue, but its certainly a variable i would eliminate.

[K_style]

Originally Posted by AWTT335i

I would try removing the anti-seize. It will skew your torque reading as well as potentially interfere with the plug ground.

Not saying that is definitely the root cause of your issue, but its certainly a variable i would eliminate.

So no anti seize at all?

[W Cole]

Originally Posted by K_style

So no anti seize at all?

I never use any. Maybe if this car had a 100k mile interval..

[K_style]

Originally Posted by W Cole

I never use any. Maybe if this car had a 100k mile interval..

I will try that... hope this fixes it.. Anyone else have other ideas?

[squartus]

Also says in manual not to use anti seize, never suppose to apply any or any lock tight on bolts that your torquing "unless called for" as it drastically changes the torque pressure. Think its around 30% increased torque when the bolt is lubed up like that.