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Old 10-19-2015, 05:51 PM   #1
Padraic
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Join Date: Feb 2015
Location: Sydney
Posts: 26
My Ride: i
Limp Mode Problem Solved

Hi Guys

there are plenty of questions on the forum and lots of good advise
I thought i would post an Answer to a difficult problem i had on a 4 cylinder 2003 E46 318i automatic

after 6 months of intermittent limp mode and various solutions tried, the problem is solved

i have learnt a lot about BMWs through these forums

Before i did not know about
  • coil pack short
  • MAF sensor
  • Idle control Valve
  • Vacuum Leaks
  • alternator output

the problem was in the eccentric valve sensor
oil had leaked into the sensor and when the car heated up it stopped sending its signal and put the car into limp mode.

the problem occured only after 20 kilometres of driving

after replacing this sensor I have now done over 1,000 kilomtres trouble free.

thanks for all the suggestions and help with the original problem
very much appreciated

Padraic
Sydney Australia
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Last edited by Padraic; 10-19-2015 at 08:13 PM.
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Old 10-19-2015, 07:32 PM   #2
fgin
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Join Date: Jan 2009
Location: Melbourne
Posts: 2,670
My Ride: e46 facelift
Thanks for the update, I had a similar issue with my N42B20 where the Crank sensor had a crack that caused it to fail intermittently. This resulted in the car going into 'limp mode' and at times the engine just cutting off while driving.

In this case, how hard was it to replace ? Did you need to remove the timing gear/chain etc ?
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Old 10-19-2015, 08:14 PM   #3
Padraic
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Join Date: Feb 2015
Location: Sydney
Posts: 26
My Ride: i
Fgin
there is no need to remove timing chain/gear just the three 10mm bolts as circuled in the picture
very easy job to do and it just lifts out

actually it was so easy i did it twice to make sure i didnt mess it up.
thanks
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Old 10-19-2015, 08:40 PM   #4
bumpgums
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Join Date: May 2014
Location: australia
Posts: 446
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You should replace the flange seal and put some driebond/sealer on it. The seal leaks then oil enters into eccentric shaft sensor giving incorrect reading. How much did a sensor cost?
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Old 10-19-2015, 09:00 PM   #5
Padraic
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Join Date: Feb 2015
Location: Sydney
Posts: 26
My Ride: i
i went to get the sensor and was quoted at BMW
$285 to scan to check then $400 plus for the part

picked it up on aliexpress AU $105 free postage
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