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      12-21-2017, 12:28 AM   #1
Pladi
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N55 Misfires Cold Start

Hi guys, after fighting with my car for a month writing here out of desperation.

Car misfires and rough idle only on cold starts. As car warms up misfires slowly disappear then eventually the car runs good. No misfires under load.

I have replaced, spark plugs, coils, and all injectors. All of this did not fix my isssues.

Codes :

Multiple Cylinder Misfire 1, 2, 3, 4 ,5, 6

Sometimes only 1 4 6.

Suspicions : My battery is original car is 2011 but no issues starting at all.
Fuel quality or fuel filter... ? My tank is near empty going to try to refill

I cleaned the MAF and reset DME by disconnecting battery no change.

No long cranks. No other codes only misfire/fuel cutoff due to misfire and damaging exhaust gas.

Any other ideas ? Does N55 have vanos selenoid should i go that route ?

Car ran all summer perfect. Once cold weather and sitting in garage then i started noticing this issue.
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      01-06-2018, 09:31 PM   #2
prime300
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Quote:
Originally Posted by Pladi View Post
Hi guys, after fighting with my car for a month writing here out of desperation.

Car misfires and rough idle only on cold starts. As car warms up misfires slowly disappear then eventually the car runs good. No misfires under load.

I have replaced, spark plugs, coils, and all injectors. All of this did not fix my isssues.

Codes :

Multiple Cylinder Misfire 1, 2, 3, 4 ,5, 6

Sometimes only 1 4 6.

Suspicions : My battery is original car is 2011 but no issues starting at all.
Fuel quality or fuel filter... ? My tank is near empty going to try to refill

I cleaned the MAF and reset DME by disconnecting battery no change.

No long cranks. No other codes only misfire/fuel cutoff due to misfire and damaging exhaust gas.

Any other ideas ? Does N55 have vanos selenoid should i go that route ?

Car ran all summer perfect. Once cold weather and sitting in garage then i started noticing this issue.
Same thing happened to me to (minus the misfire codes) my car start acting up after we went through almost 2 weeks of -25 celcius
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