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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N52 Help: Vibration at idle :(



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      06-15-2020, 05:38 PM   #1
snooked123
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N52 Help: Vibration at idle :(

Hi All,

I bought a 2008 328i N52 engine with 113,000 miles in the beginning of the year. It had vibration at idle to begin with but I thought it was just the motor mounts. So I replaced the motor mounts, then I replaced the valve cover with a new one but vibrations persisted. Cleaned the MAF, non exhaust vanos too plus I have replaced the front control arms .

Then I changed my gas to Shell and then to Chevron and that reduced the vibrations quite a bit so I then took out the injectors and had them ultrasonically cleaned. After injector cleaning my fuel economy has improved quite a bit but the vibrations are still there. Vibrations are much better than they were when I bought the car but they don't go away.

My tach needle is steady, the vibrations disappear completely when I turn on the AC. No check engine light.

Will appreciate any help .

**It seems that I have posted it in the wrong forum, how do I delete this thread or have it moved to the right forum? Thanks!

Last edited by snooked123; 06-15-2020 at 08:27 PM..
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      06-17-2020, 02:00 PM   #2
E92William
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Have you been able to scan it with a proper scanner that reads Bmw specific codes? This would give an insight into the issue also reading fuel trims would aswell with live data
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      06-17-2020, 05:26 PM   #3
snooked123
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I did use BMW scanner tool but no faults showed up. I looked at fuel trims too and it seems that LTFT for bank 1 were slightly +ve but nothing that would trigger a check engine light. The LTFTs remained slightly +ve even at 2000rpm.
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      06-17-2020, 05:35 PM   #4
E92William
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Quick thing you can try out is unplugging the maf sensor and seeing how it runs without it. Sometimes they can go bad and without giving a code. If it can be seen in video you should record it to see how bad it sounds if at all
This is a bit weird since your fuel trims are good
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      06-17-2020, 09:51 PM   #5
snooked123
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Let me try that and record it as well. I am kind of at a loss at the moment, I am thinking of doing a fuel pressure test and just for the heck of it a compression test too.
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      06-18-2020, 12:34 AM   #6
colorado.e9x
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PCV has a common problem with the diaphragm tearing. Makes a vacuum in the crank case, an idle surge, as well as oil loss. Mine needs replaced as I have all these problems
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      06-19-2020, 10:06 PM   #7
snooked123
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Connecting or disconnecting the MAF has no effect whatsoever on the car except for triggering the check engine light. What does that mean?

@coloradio.e9x: I replaced the valve cover so I am hoping that the PCV is not the culprit.

Last edited by snooked123; 06-19-2020 at 10:32 PM..
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      06-20-2020, 09:31 AM   #8
juld0zer
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Manual or auto?
When were the plugs changed last? What plugs are installed? What coils?

I find the N52 very tolerant of marginal ignition components, ie it takes a complety dead coil or broken plug to bring on the engine light but it will demonstrate quite obvious symptoms
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      06-20-2020, 09:44 AM   #9
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This may be covered under SULEV
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      06-20-2020, 05:38 PM   #10
snooked123
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It's an automatic. I changed the plugs about a 1000 miles ago with NGK iridium but the coils are very old.

It's not SULEV
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      06-20-2020, 11:12 PM   #11
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What engine mounts did you use when you replaced them?
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      06-21-2020, 12:49 AM   #12
snooked123
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I used lemforder
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