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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 > 29CE, 2AAF Under Hard Acceleration



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      10-25-2018, 07:16 PM   #1
ensoniq
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29CE, 2AAF Under Hard Acceleration

Im new owner of the 2007 335xi, all stock. previous owner did few repairs and service on it like, including replacement of top (intake manifold?) gasket.
had "reduced engine power" under hard acceleration.
with codes:
30FF: turbocharger , boost pressure too low
2AAF: Fuel pump, plausibly
found out the intake pipe wasnt all the way in, that took care of 30FF code.


so now have these issues:

under hard acceleration over around 4-5k+ Service Engine Soon light comes up and engine runs rough,
after restart SES light goes away.

Current Error Codes Present:
29CE combustion misfires, cylinder 2 (goes away after restart )
2AAF Fuel pump, plausibly (goes away for some time after clearing codes)

about the 29CE, I found if thats the only code than to check spark plugs, coil packs, fuel injectors etc.
If I find a bad coil can i replace just one or have to replace all 6 ?


any help greatly appreciated
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      10-28-2018, 01:52 PM   #2
ensoniq
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Right before the service engine light comes on the car jerks. Can it be the turbos ?
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      08-08-2019, 05:04 PM   #3
Eddy18
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Hey I have the same problem did you have it fixed?
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      08-08-2019, 09:52 PM   #4
mweisdorfer
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What's the pressure reading of your LPFP at idol & WOT?
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      08-17-2019, 03:21 PM   #5
darwin08
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I'm having the same issue. When it starts to shake/shudder it's pretty violent. The engine then keeps missing badly and the Check engine soon light comes on. If I shut down it's gone when I start up. If I keep driving gently (due to the missing) It gradually goes away and the check engine soon light goes out.
I've taken it to the dealer several times but their only intrest seems to be to charge as much as possible and ignore my input. They also stated that several cylinders showed running lean. They first said I needed to replace the coils and plugs until I reminded them they just did that two years ago. Then they said the valve cover was cracked and leaking oil ( which it apparently was) and that the crack could be causing a vacuum leak. I knew that last part was utter bullshit but I needed to stop the oil leak. Needless to say it had no effect on the problem. I suggested that they replace the fuel injectors while the valve cover was off but aparently BMW doesn't like to do warranty work on older cars and they dismissed the suggestion out of hand.
So if you find a solution I'd be most grateful.
Also which code scanner should I get since it seems I'm on my own here.
Thanks

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      09-09-2019, 05:00 PM   #6
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I had 29CE.

One the lateral electrodes was touching the center electrode. I opened the gap, so far so good, no more knocking or 29CE.
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      09-10-2019, 06:27 PM   #7
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Quote:
Originally Posted by ensoniq View Post
Im new owner of the 2007 335xi, all stock. previous owner did few repairs and service on it like, including replacement of top (intake manifold?) gasket.
had "reduced engine power" under hard acceleration.
with codes:
30FF: turbocharger , boost pressure too low
2AAF: Fuel pump, plausibly
found out the intake pipe wasnt all the way in, that took care of 30FF code.


so now have these issues:

under hard acceleration over around 4-5k+ Service Engine Soon light comes up and engine runs rough,
after restart SES light goes away.

Current Error Codes Present:
29CE combustion misfires, cylinder 2 (goes away after restart )
2AAF Fuel pump, plausibly (goes away for some time after clearing codes)

about the 29CE, I found if thats the only code than to check spark plugs, coil packs, fuel injectors etc.
If I find a bad coil can i replace just one or have to replace all 6 ?


any help greatly appreciated
2AAF is probably irrelevant, you can google why, and 30FF is just telling you the DME shut off the boost because you're misfiring.

29CE is your problem. Most likely plug, coil or injector. Very easy to test the first two - just swap with a different cylinder (one at a time) and see if misfire follows.

Neither plugs nor coils need be replaced in sets although it's generally a good idea. Injectors don't need to be replaced in sets in some circumstances, depending on what index numbers they are i.e. if they are all index 11 or 12, you can just replace one. If they are below that, BMW recommends that they be replaced for the whole bank (i.e. 3 at a time). Don't forget that the DME needs to be coded to reflect the new parameters of each new injector.
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