p0306

Asked by GuruZZG98 Oct 13, 2017 at 12:27 PM about the 2006 BMW 3 Series 325i Sedan RWD

Question type: Maintenance & Repair

Ok guys need help. I have 06 325i i got an P0306 code here what ive done
already: new coils, new spark plugs, swap injectors, clean vanos, camshaft
sensors, sent out DME to get repaired (they confirmed that there was errors
in pluse width), check for vacuum leaks.

Got DME back plugged it in. No difference still got the same code misfire
cylinder 6

While car is running i can disconnect each coil one by one and idles changes
for 1-5 except for cylinder 6 there no idle change no difference at all on that
cylinder.

I check the spark plug and its black powdery on that cylinder all other look
normal

Its not im not getting any spark at all

I dont know what else it could be? Any sugguestions????

2 Answers
30,130

mikeatpriestlake answered 6 years ago

get a cheap hei spark tester and confirm that there is no spark to that cylinder. you can also check if spark is at the coil on number 6 with that tester. if there is spark at the coil, the it is likely a bad wire. if you have spark everywhere, check the compression on that cylinder to make sure it has compression to meet specs for your engine.

Mark helpful

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