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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > N52 stumbling / engine dies



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      01-14-2017, 02:10 AM   #1
TurnersInOz
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N52 stumbling / engine dies

Hello everyone,
I've recently picked up a 2006 330i with north of 200,000 KM's on the clock. I am in the process of setting up what maintenance I want to do but would appreciate some input on one issue the car has.

When I first start the car, it stumbles for a second or two, and then smooths out. When driving at lower speeds (say 30 KM/Hr) and I try to accelerate, it can stumble quite badly. If I do not let up on the pedal it feels as if the engine will die.

Sitting at idle in park if I floor it, I can easily kill the engine.

Right now I do not have the ability to pull codes, but I will soon (using Torque).

To me this sounds like a vacuum leak, whcih I will look for within the next day or two. If this was an E46 I'd be going after the intake boots.... Does the E90 have the same issue, or would it be best for me to look elsewhere for the leak, or is there something else I should be looking at?

Thank you for your help,
Scott
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      01-14-2017, 04:16 PM   #2
ny325
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Check your engine coils, and spark plugs. Good luck OP.
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      01-14-2017, 06:26 PM   #3
TurnersInOz
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Thank you ny325. Plugs will be changed regardless. I wasn't sure if I wanted to replace the coils anyway, I'll pull a few and see how they look. Might be just as well.
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      01-14-2017, 11:58 PM   #4
TurnersInOz
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So I got stuck into the engine today, having a look at the state of things. My stumbling issue may be MAF related. I moved the car when I had the airbox removed. and there was no stumbling. After the airbox was back in, stumbles.
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      01-16-2017, 05:28 PM   #5
raleighBahn
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Your MAF sensor on the back of the airbox would be the place to look, if it indeed behaved as you described (ie went away when removed).
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      01-20-2017, 04:28 PM   #6
TurnersInOz
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Thank you raleighBahn. I've not received my OBD2 module yet, but I think I'm going to go ahead and get a new MAF anyway as it seems to be getting worse.
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      01-24-2017, 11:36 PM   #7
DesmondF10
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Purchase CRC MAF Sensor Spray if available in Oz.
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2009 328i, Crimson Red/Sport Suspension, Full Bavsound
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      01-26-2017, 04:07 AM   #8
TurnersInOz
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Hi Desmond, I've done all that, no difference. Waiting on an order from FCP at the moment whcih includes a new MAF.
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      02-28-2017, 03:23 AM   #9
TurnersInOz
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So I thought I might give an update on this.
New MAF, no change. The engine still starts rough, and today it took me four tries to get it to stay running. I've done some unrelated work to it (just taking care of the normal maintenance stuff) so I'll see if there are any codes since I need to reset the oil change interval anyway.
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      02-28-2017, 04:06 AM   #10
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check the eccentric shaft sensor and the intake boot.
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