E36 31/28 won't rev past 5700rpm

Thread in 'Technical Questions' started by pikeydrift, Apr 28, 2014.

  1. pikeydrift

    pikeydrift Member

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    Can anyone help me please I've got an s reg 318 with a 328 engine transplant. It's been working fine and bouncing off the limiter now suddenly it will not rev past 56-700 rpm!
    Thanks
     
  2. Shaarkey

    Shaarkey Member

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    Friend had a similar problem with an 18is conversion he said there's too much airflow through the exhaust, engine requires back pressure to function correctly. I think his hit the limiter at the same point. Good luck
     
  3. Stavros

    Stavros Active Member

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    That's total bollocks.
     
  4. 1N5_N15

    1N5_N15 Member

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    Quoted for truth
     
  5. 1N5_N15

    1N5_N15 Member

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    Try more like a blocked exhaust or intake. Or poor fuel flow
     
  6. pikeydrift

    pikeydrift Member

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    Cheers all but I think I've pinpointed it to vanos solenoid seals
     
  7. Shaarkey

    Shaarkey Member

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    haha worked for him.
     
  8. dan_gsxr

    dan_gsxr Member

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    had this problem recently where mine would only go to 5.5k

    turned out to be the rear speed sensor! it sends a signal to the abs and that sends a signal to the ecu. if the ecu doesnt get the correct reading it lowers the rev limit. normally kicks in a fault for vehicle speed in the ecu
     
  9. turbokick

    turbokick Member

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    +1

    It could be they have missed some sensor.
     
  10. pikeydrift

    pikeydrift Member

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    Do you mean the sensor in the diff casing?
     
  11. dan_gsxr

    dan_gsxr Member

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    no mate, the actual abs sensor in the hub.

    mine turned out to be the o/s/r playing up
     
  12. pecs

    pecs Member

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    Had the same problem with the old 320. It will be one of the rear ABS sensors mate.
    You could pull your ABS relays, see if that sorts it.
     
  13. pikeydrift

    pikeydrift Member

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    Right finally got to the bottom of it.
    After rebuilding the vanos with new seals it still didn't work, and turned out to be a lack of speed signal to the ecu I bridged pin 15 ecu to pin 2 blue plug back of dash after speaking to someone who had a similar problem and it now revs freely, just in time for wheels tomorrow!!!!
     
  14. olew3523

    olew3523 Member

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    this happens to almost every engine swap lol, and when you pull the fuse to abs, ive ran the same bypass wire on every conversion ive done, gay ecu's
     
  15. kossa

    kossa Member

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    I had same problem. replaced ecu and work for me .
     
  16. Brownie888

    Brownie888 New Member

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    Yeah had the same problem on all 3 compact 2.8 conversions iv done and just did the wire from back of clocks to ecu trick, also if you splice the wires for the rear offside abs sensor into the diff sensor wiring under the back seats works too
     

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