misfire between 1800 to 2000 revs - any ideas?
03-01-2012, 10:58 AM
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Hi there,
I'm on my 2nd Bmw garage and still no closer to finding a cure to my mis-fire. The car is a March 2005 530d with 65k on the clock. The car has developed a misfire between 1800 to 2000 revs. It idles fine and revs to 1800 and seems to get a bit stuck till 2000 revs then carries on smoothly. The misfire issue is there 99% of the of the time but sometimes its not as bad, other times worse. Does not matter if car is warm or not.
There are no fault codes coming up now but the first bmw garage replaced the glow plugs, and the second had the injectors checked and overhauled. They are detecting that the missfire is with cylinder 6. They have swapped over injectors and even tried a new one on cylinder 6 but it made no difference after the car was run in. Initially they advised me it had disaperared, only to return after a test drive. Swirl flaps are all also fine and carbon buildup in inlet manifold was below average. The garage fully belived it was an injector issue, hence why they tried a new one.
Any ideas at all as both myself and the garage are trying to decide what to do. Next course of action would seem it be to open the engine, but we both think the answer us not there.
Any ideas or suggestions would be really appreciated!
I'm on my 2nd Bmw garage and still no closer to finding a cure to my mis-fire. The car is a March 2005 530d with 65k on the clock. The car has developed a misfire between 1800 to 2000 revs. It idles fine and revs to 1800 and seems to get a bit stuck till 2000 revs then carries on smoothly. The misfire issue is there 99% of the of the time but sometimes its not as bad, other times worse. Does not matter if car is warm or not.
There are no fault codes coming up now but the first bmw garage replaced the glow plugs, and the second had the injectors checked and overhauled. They are detecting that the missfire is with cylinder 6. They have swapped over injectors and even tried a new one on cylinder 6 but it made no difference after the car was run in. Initially they advised me it had disaperared, only to return after a test drive. Swirl flaps are all also fine and carbon buildup in inlet manifold was below average. The garage fully belived it was an injector issue, hence why they tried a new one.
Any ideas at all as both myself and the garage are trying to decide what to do. Next course of action would seem it be to open the engine, but we both think the answer us not there.
Any ideas or suggestions would be really appreciated!
03-01-2012, 11:59 AM
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I felt the same thing with my 545i V8. It would run rough or seem to misfire between 15 and 2k RPM. I claeaned the MAS with CRC MAS cleaner. The engine ceased running rough and overall runs much smoother.
Just a possibility.
Just a possibility.
03-01-2012, 01:42 PM
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Thanks Cricketts, I will check with the garage to see if this has been done or not. I guess as the problem seems to be only with cylinder 6, they might have discounted that. It's got to be a fueling issue i think. Just very difficult to diagnose with no error codes coming up for the garage to investigate,
03-02-2012, 12:19 AM
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Spoke to the garage and they are goind to fit blanking plates for the swirl flaps. The issue they said is the smooth running control, but all the injectors have been checked so hopefully, that might help it! Still at a loss what could cause just cylinder 6 to show a misfire.
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