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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > misfiring now engine knock ?



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      10-25-2013, 08:35 AM   #1
E90305
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misfiring now engine knock ?

was misfiring now its knocking , when i rev you hear it but also my waste gate chatters so cant tell to much but take a look at this any info would be appreciated


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      10-25-2013, 11:03 AM   #2
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Anyone?
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      10-25-2013, 11:14 AM   #3
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Do your spark plugs have over 20,000 miles on them? Did you change them?

Have you tried moving your coilpacks from a cylinder that is misfiring to a cylidner that isn't misfiring to see if it moves?

Have you any other codes related to fuel either injectors or fuel pumps?

How many miles are on the vehicle?

Has it ever had an intake valve cleaning?

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Nothing from your video really stands out with an obvious answer but you should solve your misfires first then move onto the next potential problem.
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      10-25-2013, 11:21 AM   #4
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Knock is pre-detonation and it's not continual unless there are a lot of issues. There's a good chance you're not hearing knock, but the injectors or valves.

You can generally tell if you're experiencing knock by checking the knock value when data logging or by checking to see if timing is being pulled when logging.
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      10-25-2013, 11:33 AM   #5
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Yes I move the coils I cannot reproduce the misses, The car goes into limp mode now the spark plugs I'm not sure how many miles they have I bought the car with 110,000 miles and the car has 116,000 miles now I am not sure if the valves were cleaned. I read the codes off the JB4 an boost leak was coming up 30FF
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      10-25-2013, 11:36 AM   #6
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Also the knocking only starts when the car is warm there is none when it's cold
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      10-25-2013, 08:20 PM   #7
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ok so the plugs where shot , cyl 4 was soaked in gas , so i need to replace that injector , would that cause engine knock?

Last edited by E90305; 10-25-2013 at 08:30 PM.
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      11-06-2013, 02:24 AM   #8
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2011 BMW 335i  [2.40]
It sounds like a hydraulic lifter to me.
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      11-06-2013, 07:50 AM   #9
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Quote:
Originally Posted by WhiteFury View Post
It sounds like a hydraulic lifter to me.
White fury ...:thread jacked...:now get over to modifying stock exhaust thread and spill your secrets haha
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      11-06-2013, 11:14 AM   #10
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Sounds like its coming from inside the engine.
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      11-06-2013, 12:15 PM   #11
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Lol.
Leaky injector to replace and plugs. If it knock a code is thrown.
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      11-07-2013, 08:47 AM   #12
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Took it over to eurowerks down here in sfl and can't tel me for sure but could be a wrist pin they say
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