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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Misfiring on cold start.



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      10-27-2016, 10:29 AM   #1
Rude Boi Kvone
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Misfiring on cold start.

[IMG][/IMG]How's everyone doing, I'm new to the forums. I recently bought a 335i E92 2009. I currently live in NYC and on a cold morning I went to start my car and I notice the car it's idling rough and then the cel came on. Ran the codes and it shows that cylinder 1-4 and 6 is misfiring. I have to turn the car on and off maybe 2-3 times for it to warm up normal. I'm planning on switching to the NGK Iridium plugs but I'm not sure if that will fix it.

Only thing that has me confused is once the car has warm up and I get to driving, the car drives normal and after a while the CEL goes off. And this only happens on a cold start. Since it's getting colder in NYC

The previous owner kept up with all the service and maintained the car properly. The HPFP was already replaced and according to the records, the oil was changed on time.

Other than that. Ok really loving the car, I already got a lot of things planned but I really want to get this sorted out first then start on it.
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      10-27-2016, 11:32 AM   #2
Phil325i
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Welcome to the forum! You don't say how many miles on the car, but my guess would be you've got a faulty injector(s) that is leaking fuel overnight and causing poor idle until the wet fuel evaporates off.
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      10-27-2016, 12:22 PM   #3
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Could be a leaky injector but try to clean them first with the Techron Fuel injector cleaner. Give it a shot. Some people including myself tried it and it works good.
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      10-27-2016, 01:12 PM   #4
Rude Boi Kvone
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It's at a 117k right now and it's all highway miles and thank you
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      10-27-2016, 01:14 PM   #5
Rude Boi Kvone
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And I'll try the fuel injector later on today and see how it behaves
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      10-27-2016, 04:04 PM   #6
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When were your plugs changed last - how many miles between then and now? Is the car stock?
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      10-27-2016, 04:13 PM   #7
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The car is fully stock and I'm not sure when they were lasted changed.
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      10-27-2016, 05:55 PM   #8
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Swap your plugs - cheap, if they've never been done it's overdue, and has a realistic change of fixing your problem.
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      10-27-2016, 10:38 PM   #9
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As you replace your plugs look for any black and wet that smell like gas, that shows the injector is bad.

If you're purchasing locally, go ahead and grab a coil so you have one available if that is the issue.

Note, you may only have one misfiring cylinder that is causing the rest.
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