Please help erratic reving

  1. Regular Poster Joined: Jun 2009 Coventry Posts: 438 Citroen Saxo X 1.1i
    #1
    Hi all, looking for some help fairly urgently as i have now been of the road fr 3 weeks and riding a bike to work is going to kill me slowly and painfully.

    Basically three weeks ago, i was driving my car along and came to a stop at some lights the engine was running really lumpy, and when i pulled off the revs were going up and down between two RPM's (power and no power) so when driving in gear the car was jerking really badly, however if i floored the throttle it would rev and move off. The next day i drove to work in the morning fine, however when starting the engine it required some throttle to tick over but when warmed up it was idling fine. Coming home from work the revs were again going up and down fairly constantly whilst driving so there was a loss of power and then power no power etc etc. Also traffic lights became very tricky.

    Just wondering what you think may be the problem.

    Things i have done so far are,

    - changed the coil pack
    - changed the plugs
    - changed the green temperature sensor on the side of the engine

    today i removed the air inlet from the carburettor body when the engine was warm and set the throttle in a position that creates the alternating revs, and noticed that the fuel doesn't seem to be injected when the revs die??

    What may be causing this?

    Any help will be much appreciated.
    Thanks in advance,


    btw, the car is a 1997 'P' Reg saxo 1.1i x
    Thanks again

    Nobby
  2. Frequent Poster Joined: Jul 2009 Woodville ,Derbyshire Posts: 509 Peugeot 407 sw X-line Ford Focus St 225
    #2
    could it be the idle air control valve? Or stepper motor? (same thing) Just an idea....This would make it rev up and down erratically on its own.
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  3. Regular Poster Joined: Jun 2009 Coventry Posts: 438 Citroen Saxo X 1.1i
    #3
    hmm, i shall have a look at that then, i was going to buy a new carburettor body and injector tomorow from the scrappy, cause there was definatly no fuel getting injected when the revs dropped. would the ICV do this ?
  4. Frequent Poster Joined: Jul 2009 Woodville ,Derbyshire Posts: 509 Peugeot 407 sw X-line Ford Focus St 225
    #4
    Quote:
    Originally Posted by NobbyClarke View Post
    hmm, i shall have a look at that then, i was going to buy a new carburettor body and injector tomorow from the scrappy, cause there was definatly no fuel getting injected when the revs dropped. would the ICV do this ?
    The ICV was playing up on my mums car .She would be sat at the lights next to another car while her engine (Punto) was revving like she wanted to race lol ! She was so embarrassed .Thats what it was for her.Also we replaced the temperature sensor on the engine which told the ecu if the engine was hot or cold and to fuel properly.Hope this helps ...
  5. Regular Poster Joined: Jun 2009 Coventry Posts: 438 Citroen Saxo X 1.1i
    #5
    thanks, mine will idle okay when warm but when you apply revs is when the problem arises. i had the car on the drive today reving erratically whilst my uncle held the throttle we disconnected the temp sensor and this didn't change the revs but we put the new sensor on anyway and it still does it.
  6. Regular Poster Joined: Jun 2009 Coventry Posts: 438 Citroen Saxo X 1.1i
    #6
    bump please help need this fixing asap.

    thank you

  7. Regular Poster Joined: Jun 2009 Coventry Posts: 438 Citroen Saxo X 1.1i
    #7
    fixed twas the ICV