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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Plugs after about 20k miles TUNED



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      09-11-2012, 03:20 AM   #1
joec500
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Plugs after about 20k miles TUNED

They actually look pretty good, except for #6, which is a lot more black than the others. I was experiencing stutters at High RPM and Load, so I decided to replace the plugs. Went back out for a test drive and everything seems smoother, I was curious why my cylinder 6 plug is so much darker? Failing injector?

Cylinder 1 is the far left and cylinder 6 being the one on the far right.





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      09-11-2012, 03:30 AM   #2
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i had the same exact symptoms you were experiencing. when i had a friend of mine took out my plugs, we couldnt get the 6th plug out because my coil somehow cracked and split into 2 pieces. When we got all the coil pieces out, we checked the plug and it was darker than usual
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      09-11-2012, 04:17 AM   #3
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I had the same issue and a new injector fixed it.
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      09-11-2012, 04:18 AM   #4
joec500
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Also note: I am getting idle hiccups after changing the plugs. And yes I cleared all adaptations.
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      09-11-2012, 10:09 AM   #5
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I'm having cylinder 6 misfires just ordered all new plugs and plan on installing it tomorrow.
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      09-11-2012, 10:36 AM   #6
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Quote:
Originally Posted by joec500 View Post
Also note: I am getting idle hiccups after changing the plugs. And yes I cleared all adaptations.
Could be fuel related, specifically injectors.
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      09-11-2012, 10:39 AM   #7
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Quote:
Originally Posted by Jeff@topgearsolutions View Post
Could be fuel related, specifically injectors.
+1
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      09-11-2012, 10:53 AM   #8
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I've seen a questionable injector cause that sort of black carbon buildup on plugs. The tip of that injector was also sooty black, while the others had no such deposits. Possible that the injector doesn't have a good spray pattern and combustion suffers, especially when the fuel pressure drops to 50bar at low load and idle.
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