Question about 2008 BMW 328xi
Engine runs smooth at idle and when reved up w/o load. When driving under hard acceleration there is a misfire. Plugs, cap, are new.wires are not new .
I would check the coils...In have seen some fail at under 80k miles but mostly you can get well over 100k miles... I do not know if you have a great scanner or not, but what I do is use a scanner and run a power balance test and this graphs the cylinders performance and coil output.Also you can try cranking the car and let it get to operating temp,then go to each coil and disconnect it,you should have a rpm drop,if you do not get the rpm drop then that coil is bad.Last if you can test the resistance of the coil with a multimeter...Make sure you have the car scanned with a good scanner 1st to point you in the right direction.
Posted on Apr 15, 2014
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Posted on Jan 02, 2017
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