N55 Cold Start Missfire

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Manufactured from 2004 to 2013

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Evil135i
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N55 Cold Start Missfire

Post by Evil135i » Thu Dec 14, 2017 10:54 pm

Evening all.

Started the car Wednesday evening after being sat for 3 days due to the snow and couldn’t get it off my drive. Started as usual but then developed a random misfire it then went on to clear as it warmed up. Started the car this morning all was fine. Got in it to leave work and same again misfire literally soon as it started up and it cleared after 2 mins or so. It’s had plugs at 40k and is now on 62k.
Do the N55 engines suffer with leaky injectors or is r just the N54 engines?

Thanks all
Alex

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Toed64
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Re: N55 Cold Start Missfire

Post by Toed64 » Fri Dec 15, 2017 12:02 am

I had a slight random miss at idle and it was caused by two dying coil packs. The symptoms returned after another couple of weeks, so I changed them all and the problem was resolved.

Check the plugs too - it's not unknown for plugs to start tracking at 20,000 miles especially if the gaps have burned a bit wide...this can kill coil packs too.
2008 E81 130i
2010 E82 135i - now sold

Zutm710
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Re: N55 Cold Start Missfire

Post by Zutm710 » Fri Dec 15, 2017 9:12 pm

Hi Alex,

How did you diagnose the misfire? Did you get any codes?

My previous car (N55) had random misfire across all cylinders according to live data through MHD but no codes were stored. I changed two set of plugs, first Bosch then NGK and new coil packs none helped.

Regards,
Artur

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