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BMW 3-Series (E90 E92) Forum
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N53 misfire
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11-10-2020, 06:57 PM | #1 |
Registered
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Rep 2
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Hi all,
I have 2011 e93 330i that's misfiring on cylinder 6 only. On cold starts it's rough and if I let it idle rough long enough on start up the engine light come on but goes if I switch the car off and on. If I leave the engine light on and take off it judders/hesitates really bad even when I drive it at normal road speeds. So usually what I do is start the car up, let it warm up and at this point the EML light has come on, when the cars warmed up I switch the car off and on so the EML light goes off and I start my journey. The car then runs/ accelerates fine from what I can tell but when I stop at lights for example it idles a little rough but doesn't bring the EML light on if idling warm. I first changed coil pack on cylinder 6, Still misfiring. Then I changed all spark plugs, still misfiring. Then I changed injector on cylinder 6 ( index 11 and coded to correct values) still misfiring. Spark plug on cylinder 6 had more soot than the rest. What could it be? I really don't want to go to dealers but I'm about to throw in the towel. Codes that come up: Misfire on cylinder 6 (0029D2) Misfire at low tank level (0029D9) P.s. this problem persist throughout all fuel levels. Also forgot to mention that a mechanic done a compression test on all cylinders and was not concerned. |
11-11-2020, 01:23 AM | #2 |
e91Owner
425
Rep 1,129
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N53 misfire
Soot on the plugs due to incomplete combustion and those codes indicate an injector leak normally. If you take plug out of cylinder 6 from a cold engine after sitting overnight and it smells of gas, that's likely your culprit. I realize that you have already replaced it, but your symptoms are still pointing to the same issue.
Other than that swapping the ignition coils from 6 to another to see if the problem travels with the coil. |
Appreciate
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Rm950.00 |
11-13-2020, 10:51 AM | #3 |
Private First Class
31
Rep 131
Posts |
Check your valve cover gasket, it could be leaking oil into the spark plug wells. Other thing to try is a walnut blast, the n53 gets pretty bad, especially cylinder 6 in my case.
When you replaced the injector did you use new seals? |
Appreciate
1
Rm950.00 |
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