Whats next in diagnosing cylinder 5 and 6 misfire
I have a 98 M3. I was driving at about 50 mph when my M sounded like a subi with exhaust. Attributed the noise and feel to a misfire and a scan that day found it to be cylinder 5 and 6.
The codes thrown were as follows:
Now ive replaced an o2 sensor on Bank 1 sensor 2, but that bad sensor just resulted in a jump in revs, not a misfire.
Could the o2 sensor be causing both cylinders to misfire?
Ive already replaced all 6 plugs and replaced the 5 and 6 coil packs because im broke. I tested the wiring harness into the packs and also the injector harness' for 5 and 6 and the test light kicks right on. Ive read but cant find, that the test light should blink when testing the injector connections, true?
I unplugged the MAF this morning and that didnt change anything.
Im just at a stand still and i drive for my job and my 325 is sitting around with timing issues so any help with the misfire diagnosis would be great.
O2 Sensor WILL NOT CAUSE a misfire. All the O2 sensor does is compare oxygen content in the atmosphere to the oxygen content in your exhaust so the PCM can change fuel trims and control emissions. Do you have a mechanics stethoscope? Listen to the individual injectors while the engine is running and make sure they are all firing (you'll hear click click click consistently across all the injectors if they're ok). A clogged or non firing injector WILL cause a misfire and cause an O2 sensor code. The test light for the injector harness are called "noid" lights, unplug the injector - plug in the light, it will flash whenever the injector should fire. DO NOT USE a normal low impedance test light, even using it just once can fry the drivers in the controller. Also how old is your fuel filter? Never bad to put new filters on, a lot of times solves all kinds of problems.
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