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Thread: Drop in revs when cold

  1. #1
    Traffic Light Racer
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    Oct 2016
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    Cooper S
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    Default Drop in revs when cold

    As the title suggests, my mini is prone to a serious drop in revs when moving off when cold. The revs drop to the point that it feels like itís going to stall but it rarely does, it also makes a horrible rattley noise when it does this. Itís mainly an issue on my way home from work as I have several junctions and roundabouts to negotiate before the engine warms up. Any ideas???

  2. #2
    Theory Test Pass
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    Oct 2018
    Location
    Perth
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    R50 cooper
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    19

    Default

    Quote Originally Posted by Julz View Post
    As the title suggests, my mini is prone to a serious drop in revs when moving off when cold. The revs drop to the point that it feels like it’s going to stall but it rarely does, it also makes a horrible rattley noise when it does this. It’s mainly an issue on my way home from work as I have several junctions and roundabouts to negotiate before the engine warms up. Any ideas???
    I take it that it is fine when warm? I wonder if it throws up any codes, your welcome to use my code reader if that would help?

  3. #3
    Traffic Light Racer
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    Oct 2016
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    Cooper S
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    Yes, fine once itís warmed up. Itís been on a code reader at the garage (thanks for the offer) a few months ago and all it was coming up with was the issues with the bypass valve doo-daa (now replaced).

  4. #4
    Site Owner MINI William's Avatar
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    Sep 2006
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    Midlothian
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    F56 JCW Challenge & R55 Clubvan
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    Default

    Have you had the car remapped? Could be a map issue
    MINI F56 John Cooper Works Challenge 20 - JCW Shift Light, JCW Pro Mats, JCW Carbon Fibre Gearknob, JCW Pro Diffuser, Chilli Red Engine Cover, Carbon Fuel Filler, Black Door Handles, DuellAG Splitter, DuellAG Carbon Fibre Spoiler, Airtec Intercooler, AWE Tuning S-FLO CAI, RSI Carbon Fibre Big Scoop, Mintex Challenge Track Pads - Still More To Come

    Ice Blue R55 Clubvan - JCW Shiftlight, JCW Carbon Fibe Handbrake, JCW Carbon Fibre Dash, JCW Steering Wheel, Recaro JCW Sportster CS, CoolerWorx ShortShifter, BC Racing Coilovers, JCW Brembo 4pots, HEL Braided Lines, JCW Front Bumper, MINI Challenge Splitter, Black Rota Blitz




  5. #5
    Traffic Light Racer
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    Oct 2016
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    Cooper S
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    Quote Originally Posted by MINI William View Post
    Have you had the car remapped? Could be a map issue
    I have but it was doing this before the remap!

  6. #6
    L Plates Harmchar's Avatar
    Join Date
    Mar 2018
    Location
    Peterculter, Aberdeen
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    Mini Cooper S r56 2008
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    39

    Default

    My Cooper s tends to do this as well unless in sports mode. Pulling away from a junction is sluggish if not in sport mode. I push sports button as soon as I start engine now.
    Since the throttle is driven by wire, wonder if there is a connection between your low revs and the pedal. When you first start the engine, does the engine rev responsively with blips of throttle? Are you using sports mode when the near stalling happens?

  7. #7
    Traffic Light Racer
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    Cooper S
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    Sounds similar in that the only the only way round it is to stick sports mode on although occasionally this hasnít helped. The only downside with this is the wheel spin at roundabouts!

  8. #8
    Want More BHP!
    Join Date
    Oct 2018
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    Edinburgh
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    Mini One Graphite
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    Not had this issue from Cold, but I have had one instance of the car when warm doing this, trying to stall or put itself into stop start mode, it's not repeated itself so just putting it down to the car having a off day!

    Davy
    2009 Mini One Graphite, Minibitz Stubby aeril, Minibitz Beltline Kit, Headlight and rear lights dechromed Minibitz Black Mini Badges, Front Tow Hook, Pipercross Air Filter, Scorpion Red Power Non Reasonated Exhaust, JCW R105 Alloys! Sunstrip, Tartan Interior Mirror Cover, Osram Nightbreakers..... What's next to do??

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