05-19-2020, 11:02 AM | #1 |
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N20 152D08 Super Knocking
My 428i idle's very very rough, almost like its about to stall. I'll give a little back story. I've been running Bootmod3 Stage 1 93oct for almost 10,000kms now all stock and around 5000kms with a VRSF catless downpipe and everything was working and driving like a charm. The car then was due for a major service at 65,000 kms with spark plugs oil change etc all required, everything was allgood till the car came up and eventually popped up with 'overdue 500kms' and i started the car one day and it was like it was about to stall. This happens everytime i come to a red light as well and go to a full stop, car is about to switch off, rpms are very rough. I took the car into BMW my service advisor told me that I did not need to remove the tune so I did not. They serviced the car but they didn't see anything wrong with the idle. Stupid if you ask me. As soon as I jumped back in the car started it, immediately I realised... Very stuttery rough start, and if you just tap the accelerator pedal a little and let go the car is almost about to turn off. What could be the issue? Even flashed it back to stock, still the same problem...
OK SO I DROVE THE CAR FOR A LITTLE AFTER TAKING IT TO BMW AND DROVE IT TO CITY BACK AND BACK, JUST BEFORE RAN DIAGNOSTICS TEST HAVE RECEIVED ERROR CODES: 152D08 Super Knocking: Injection Shutdown 152308 Super Knocking Cylinder 3: Injection Shutdown I've realised the car is blowing a little more smoke than usual with the dp, what could be wrong with my N20?? Please help!!
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05-19-2020, 11:39 AM | #2 |
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Did you do the 65k service? Have you tried going back to stock tune? If you did the 65k service (with plugs), pull the plugs to make sure they were actually changed and verify the gap is correct.
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05-19-2020, 11:40 AM | #3 | ||
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Could it just be a bad injector?
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05-19-2020, 11:47 AM | #4 |
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Could be a bad injectors, gas, or coilpacks. You can try moving your coilpacks around to see if the misfire moves too (that would indicate coilpacks). Injector debugging would be the same or if a shop is doing it they can pull all of them and run them through a machine to test their flow rate.
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05-19-2020, 11:51 AM | #5 | |
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11-15-2022, 02:25 PM | #6 |
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11-26-2022, 08:01 PM | #8 | |
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01-29-2024, 08:40 PM | #9 | |
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Same problem
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PLS GIVE ME A HELP Running on BM3 stage 1 93OCT (try use ron 98 alr still the same) Last edited by f30_kai; 01-29-2024 at 08:42 PM.. Reason: add more details |
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