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Cylinder 2 misfire


Pinson-89
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On my way home from work yesterday my car started flashing it's engine management light, the car was driving fine up until that point. I got home plugged my obd reader in and it said misfire on cylinder 2, the car sounded fine didn't sound like a misfire at all. The other day a friend was behind me I was in 4th at about 30-40mph put my foot down when the car got to about 3-4k rpm it felt like the revs stopped rising for a second or 2 and my friend said it pumped out black smoke. I'm going to start with replacing spark plugs and a new fuel filter (I only use super fuels). I've deleted the code and been on a few little runs without any incidents. Also I put £60ish in last week I have quarter of a tank left and have only covered 110 miles I would expect to get close to 200, I've not really driven it hard with this tank could it be related to my misfire fault? Cheers in advance

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So on my way home I decided to unplug the maf, the revs went up slightly and I got 4codes pop up (all to do with me unplugging) it seems to drive better and I have no misfire code, so think I may have found my culprit, but shouldn't not having the maf in make the car run poor?

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Also would there be any way to test the injectors without sending them away for bench testing? Is there a how to guid for removal or are they pretty much straight forward? What's the easiest way to test the spark without getting shocked?

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