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Cylinder 4 combustion misfire
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02-08-2022, 08:08 PM | #1 |
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Cylinder 4 combustion misfire
I have an 08 335xi stage 1 mhd 91 oct and i have been getting a cylinder 4misfire on cold start , i replaced the injectors and plugs and have tried swithtching around coils and using different ones injector is brand new from fcp euro with about 20 miles on it and it seems like its leaking but ive swapped about 4 different index 12 injectors thinking it was them, will pull plugs before i start the car and are dry and look fine, after about 30 seconds after starting car will misfire i pull plugs again and are soaked in gas and black , i am at a loss please help!!😭
hpfp, lpfp ,lpfp sensor cyl 1-3-4-5-6 index 12 injectors and plugs all new |
02-08-2022, 08:26 PM | #2 | |
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02-08-2022, 08:51 PM | #4 | |
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Cold start is just to warm the cats for emission purposes. Some people having cold start misfires have had this solved by enabling this option. My car idled terrible on V9. V7 or the new V10 Seem much better.
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02-08-2022, 09:35 PM | #5 | |
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02-08-2022, 10:02 PM | #6 | ||
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02-10-2022, 09:12 AM | #7 |
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I have updated to v10 and swapped around injectors coils and plugs, and still as if injector #4 was leaking , still getting cold start misfires will pull plugs and are fine and dry before car starts then are black and wet after about 45 seconds of running, the cold start noise reduction did help a little bit but still misfires
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02-10-2022, 09:31 AM | #8 | |
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It's wet due to the miss fire / limp mode. This tells you nothing so don't worry about it. If they are dry and fine from the car sitting then it's not a leaky injector.
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02-10-2022, 09:42 AM | #9 | |
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Hit 130,000 yesterday walnut blasted around 1k or less miles ago with new intake gaskets |
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02-10-2022, 09:42 AM | #10 | |
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02-10-2022, 09:43 AM | #11 |
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02-10-2022, 09:47 AM | #12 | ||
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02-10-2022, 10:09 AM | #15 |
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Did this misfire only start happening after the walnut blasting and intake gaskets ?
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02-10-2022, 10:12 AM | #16 |
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02-10-2022, 10:14 AM | #17 |
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Well I'm stumped also. I think next step is you need to do a data zap log with MHD when the car is idling Cold.
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02-10-2022, 10:19 AM | #18 |
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02-10-2022, 10:21 AM | #19 |
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If you have the monitoring module with MHD. I think you can just start and stop a log any time.
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02-10-2022, 10:23 AM | #20 |
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02-10-2022, 10:28 AM | #21 |
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Oh shoot I'm not sure either. You could ask in the MHD look at my log thread.
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