my 1999 bmw 528i check engine light keeps coming on. Was a cylinder 4 misfire. replaced wires coils and spark plugs. 2 days later

Asked by Jul 27, 2014 at 09:17 PM about the 1999 BMW 5 Series 528i

Question type: Maintenance & Repair

showed a misfire again. what should i do

4 Answers

101,535

Next would be to check for possible fuel injector issue. On that cylinder.

101,535

http://www.obd-codes.com/p0304 -- check this out for possible causes and solutions. Also make sure all wire harnesses (coil and injector) are plugged in properly and have no frayed wires.

1 out of 1 people think this is helpful.
3,015

Did you replace the plugs with the OEM NGK's? I did not not on mine and developed a "lean misfire" problem, having replaced my coils as well, that was remedied by going back to the NGK's

725

Get yourself a peake research scan/reset tool: http://www.peakeresearch.com/fcx3.htm You will likely need the one for under the hood connectivity. It will tell you what is wrong versus just throwing money at replacing parts which may or may not fix the issue(s). Good luck.

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