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hitting rev limit at 2.5K ?

Discussion in 'Motors' started by lordedmond, 16 Jan 2006.

  1. lordedmond

    Wise Guy

    Joined: 14 Jun 2004

    Posts: 1,573

    Location: Tilchestune

    any ideas guys
    the gar is going in tomorrow to get sorted but i would like some input

    ok its a diesel , when in for service just before xmas and there was three recalls
    1 new ecu
    2 boost sensor
    3 wiring harness

    ok now the problem under part throttle in 1,2 3, the engine revs to its normal max of 5 k, in 4 ,5 ,6 if you floor the throttle the engine revs to 2.5 k and seems to hit the rev limiter

    any ideas , so they don't fob me off
    btw mpg and power seem normal
  2. Enfield


    Joined: 8 Nov 2003

    Posts: 7,396

    Location: Hampshire

    Sounds like a boost/turbo related problem to me...
  3. Del Lardo

    Wise Guy

    Joined: 8 Aug 2003

    Posts: 2,368

    Location: Cambridge(ish)

    Sounds like the ECU is going into limp home mode. Chap at work sold his 307 diesel after it went into limp home mode for the 5th time is as many months making his trip home (200 miles) take somewhat longer than it should have done.
  4. Scottland


    Joined: 18 Oct 2002

    Posts: 15,211

    Location: North Wales

    What car is it? My car does this when its in limp home mode. i.e. It's detected a fault and restricts itself to 2k rpm so that it doesn't do any (more) damage.

    Last time I had it, it had been cause by something as simple as a blocked pipe.

    Edit: As per above, mine's also a 307 :p
  5. lordedmond

    Wise Guy

    Joined: 14 Jun 2004

    Posts: 1,573

    Location: Tilchestune

    thanks for the replys guys

    if thats its limp home mode 2.5k in sixth is 95 mph :eek:

    i think 2.5 is when the turbo starts to come in but i may be wrong before the service i could get wheel spin in 5 on a very wet road in 5th at about 2.8k

    anyway i hope to have it sorted tommrow

    dont laugh guy its a almera 2.2 cdi or dci sxe 136 bhp ( its the renault engine not the nissan one )
  6. clockworks


    Joined: 4 Jan 2005

    Posts: 407

    Surely limp home mode would affect all the gears - it revs OK in first, second and third.

    My guess is they didn't fit the new bits properly, something getting fouled on the gear linkage?

    Let's hope they fix yours quicker than my Vectra 1.9 CDTi SRi - went in over 2 weeks ago, stuck in limp home mode. Won't rev over 1500rpm, and thats where the turbo cuts in!
    Apparently the dealer is waiting for a new inlet manifold from Germany.
  7. Amps


    Joined: 23 Mar 2003

    Posts: 2,652

    Location: Scotland

    Yep had this on my 307 3 times in the last 6 months they really are crap.
  8. lordedmond

    Wise Guy

    Joined: 14 Jun 2004

    Posts: 1,573

    Location: Tilchestune

    looks like the muppets fitted the wrong ecu

    the correct one's part no. should end 81A
    the one they fitted in the recall ends in 87A

    the ecu is seeing the boost as over boost and limiting the revs to 2.5K ( limp home ) only on full load , part thottle will not give the level of boost to cause the incorrectly sensed over boost