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08-04-2017, 11:12 PM | #1 |
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Yet another bank misfire thread
Hey guys and gals,
I have a 2008 M3 (@ 119k miles) that recently has started going into limp mode and telling me I have increased emissions, primarily when at part throttle and maintaining consistent low RPMs (under ~2k), such as moving in slow traffic. When the engine is cold, it's also a bit laggy/lurchy below 2k RPM under heavy(-er) throttle, and I can usually induce limp mode by flooring it from a low RPM in a higher gear. In either case, turning the car off and back on clears the limp mode. Above 2k RPM, hot or cold, it's silky smooth like the S65 always is. I assumed it would be plug/injector/coil on an individual cylinder, until I pulled the codes with my BavTech cable and it's on a whole bank: 2B39 -- Misfire with shutdown cylinder 5 2B3A -- Misfire with shutdown cylinder 6 2B3B -- Misfire with shutdown cylinder 7 2B3C -- Misfire with shutdown cylinder 8 2B41 -- Misfire with shutdown of several cylinders 2B57 -- Motor emergency programm activated 2796 -- Motor emergency programm activated 27B0 -- Secondary air system throughput bank 1 (this may be unrelated?) I replaced the bank 1 throttle valve actuator two years ago after it was causing a limp mode, but it was throwing the right codes for that at the time (2B15, 2B21, 2B25, all specifically for the bank 1 TVA)....so I'd rather not sink so much money into another TVA if that may not be the issue. Next chance I get I'll swap the pre-cat O2 sensors from left to right and see if the problem moves to bank 1, but does anyone have any other tips/suggestions? Thanks! |
08-05-2017, 02:29 AM | #3 |
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Nope, stock exhaust other than resonator delete. How difficult is it to replace a midpipe gasket, for example? Surely I wouldn't need to pull the whole exhaust off the car?
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08-05-2017, 09:00 AM | #4 |
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I testdrove an 08 for sale at a car mart for fun not long ago. Engine check light was on, some tech connected a Bosch code reader and it had misfire on cylinder 2. They said they would have it fixed in days and would contact me. 2 weeks passed and no news.
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