Misfire mystery

HoodratHoudini · 12-27-2020, 06:37 PM

So before u start this i just want to say that im 17 and have relatively any idea on how to fix this... i changed my spark plugs and now my car is throwing codes for a misfire on cylinder 1 and 6 i swapped the coils around and also changed the plugs again and its still throwing the codes could it be a wiring issue or am I actually just stupid and its something obvious?

519.E82 · 12-27-2020, 07:13 PM

Alright, lets start from the top. Why did you change your spark plugs to begin with?

When you say you switched coils around, do you mean you switched 1/2 and 5/6 or did you switch 1/6?

When you put the coils back in did you make sure the connectors fully seated and clipped in?

Did you torque the spark plugs? did you inspect the gap on them and make sure they were relatively good and didn't drop them?

I know im asking a lot just trying to skip having like 6 post.

HoodratHoudini · 12-27-2020, 08:24 PM

I changed the plugs because i just got it and dont know the service history of the car I swapped coils 1/2 and 6/5 i did gap them they were all gapped correctly and i didnt torque them and the coils are seated and plugged in correctly and i know the coils are working because i tested them with a multimeter

Lester · 12-27-2020, 08:44 PM

What model/year/engine and how many miles? Any non standard tune? Any codes? Does your engine trouble (yellow) light come on?

HoodratHoudini · 12-27-2020, 08:56 PM

I have a 2010 bmw 128i it has the n52 in it with the stock tune and the code are p0300 p0306 and p0301 and the only light that comes on is the service engine soon light and the engine has ab 160k miles on it

Lester · 12-27-2020, 09:37 PM

Was it misfiring before you proactively changed the plugs? Which brand of plugs did you put in?

You might try putting the original plugs back into cyl 1 and 6.

HoodratHoudini · 12-27-2020, 10:15 PM

No it wasn’t misfiring and i put ngk plugs in it and i can get the old plugs and try them

iminhell1 · 12-28-2020, 06:46 PM

It's possible to completely miss the plug with the boot of the coil. You'll hear it snapping, and if night you'll see a light show in the plug well.

It's also not unheard of to break the coil boot internally when removing them. One not so common but 5/6 being they are kinda a stretch to reach /awkward angle.

Though I don't think you'd miss 1 3 times, 6 maybe.

Also, a misfire isn't limited to spark. Could be you disrupted an injector ...

12-27-2020, 06:37 PM	#1
HoodratHoudini Registered 0 Rep 4 Posts Drives: Bmw 128i Join Date: Dec 2020 Location: Mississippi iTrader: (0)	Misfire mystery So before u start this i just want to say that im 17 and have relatively any idea on how to fix this... i changed my spark plugs and now my car is throwing codes for a misfire on cylinder 1 and 6 i swapped the coils around and also changed the plugs again and its still throwing the codes could it be a wiring issue or am I actually just stupid and its something obvious?
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12-27-2020, 07:13 PM	#2
519.E82 Lieutenant 245 Rep 439 Posts Drives: BMW 128i Sport (Non M) Join Date: Apr 2016 Location: Ontario, Canada iTrader: (0)	Alright, lets start from the top. Why did you change your spark plugs to begin with? When you say you switched coils around, do you mean you switched 1/2 and 5/6 or did you switch 1/6? When you put the coils back in did you make sure the connectors fully seated and clipped in? Did you torque the spark plugs? did you inspect the gap on them and make sure they were relatively good and didn't drop them? I know im asking a lot just trying to skip having like 6 post. __________________ 2008 SGM 128i - 3 Stage IM - 130i Tune - Dinan Camber Plates - BMW PE - Injen Intake - 1M Mirrors - LCI Blacklines - M4 Spoiler - Blacked 263's - Aero Bumper - Aero Side Skirts - OMGSplitter - AFE Intake Scoops
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12-27-2020, 08:24 PM	#3
HoodratHoudini Registered 0 Rep 4 Posts Drives: Bmw 128i Join Date: Dec 2020 Location: Mississippi iTrader: (0)	I changed the plugs because i just got it and dont know the service history of the car I swapped coils 1/2 and 6/5 i did gap them they were all gapped correctly and i didnt torque them and the coils are seated and plugged in correctly and i know the coils are working because i tested them with a multimeter
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12-27-2020, 08:44 PM	#4
Lester Brigadier General 295 Rep 3,350 Posts Drives: Join Date: Oct 2007 iTrader: (0)	What model/year/engine and how many miles? Any non standard tune? Any codes? Does your engine trouble (yellow) light come on?
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12-27-2020, 08:56 PM	#5
HoodratHoudini Registered 0 Rep 4 Posts Drives: Bmw 128i Join Date: Dec 2020 Location: Mississippi iTrader: (0)	I have a 2010 bmw 128i it has the n52 in it with the stock tune and the code are p0300 p0306 and p0301 and the only light that comes on is the service engine soon light and the engine has ab 160k miles on it Last edited by HoodratHoudini; 12-27-2020 at 08:57 PM.. Reason: Forgot to add something
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12-27-2020, 09:37 PM	#6
Lester Brigadier General 295 Rep 3,350 Posts Drives: Join Date: Oct 2007 iTrader: (0)	Was it misfiring before you proactively changed the plugs? Which brand of plugs did you put in? You might try putting the original plugs back into cyl 1 and 6.
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12-27-2020, 10:15 PM	#7
HoodratHoudini Registered 0 Rep 4 Posts Drives: Bmw 128i Join Date: Dec 2020 Location: Mississippi iTrader: (0)	No it wasn’t misfiring and i put ngk plugs in it and i can get the old plugs and try them
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12-28-2020, 06:46 PM	#8
iminhell1 C2H5OH 3915 Rep 2,144 Posts Drives: 2010 SG 135i auto Join Date: May 2015 Location: Darwin, MN iTrader: (1)	It's possible to completely miss the plug with the boot of the coil. You'll hear it snapping, and if night you'll see a light show in the plug well. It's also not unheard of to break the coil boot internally when removing them. One not so common but 5/6 being they are kinda a stretch to reach /awkward angle. Though I don't think you'd miss 1 3 times, 6 maybe. Also, a misfire isn't limited to spark. Could be you disrupted an injector ...
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