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Thread: Throttle Blipping on Idle - Why?

  1. #11
    Join Date
    Dec 2007
    Location
    London
    Posts
    432
    No, the condenser has a hole in it

    Since it's a Cabrio I'm unlikely to replace the condenser
    Paul
    Pure 2000 W, LHD 599cc - Engine Rebuilt Feb 08 - sold
    Passion 2000 W, LHD 599cc - Engine Rebuilt Mar 09 - sold
    Passion 1998 T, LHD 599cc - Engine Rebuilt Apr 10 - sold
    Cabrio 2001 Y, LHD 599cc - Engine Rebuilt Jul 10 Replaced Oct 16

  2. #12
    Join Date
    Dec 2007
    Location
    London
    Posts
    432
    The blipping all but disappeared until the week of my MOT

    Fortunately it did pass, but the blipping now has reached an alarming frequency

    Still no effect when actually driving, but any time the car is stationary it reappears

    I didn't try disconnecting the cruise module that intersects the throttle pedal wiring, nor have I tried spaying carb cleaner

    I will have to try that next but I'm not optimistic

    Randomly swapping out components would usually be my next strategy, but sadly I have no spare components!
    Paul
    Pure 2000 W, LHD 599cc - Engine Rebuilt Feb 08 - sold
    Passion 2000 W, LHD 599cc - Engine Rebuilt Mar 09 - sold
    Passion 1998 T, LHD 599cc - Engine Rebuilt Apr 10 - sold
    Cabrio 2001 Y, LHD 599cc - Engine Rebuilt Jul 10 Replaced Oct 16

  3. #13
    Join Date
    Jan 2015
    Location
    Devon
    Posts
    80
    Quote Originally Posted by UKKid35 View Post
    The blipping all but disappeared until the week of my MOT

    Fortunately it did pass, but the blipping now has reached an alarming frequency

    Still no effect when actually driving, but any time the car is stationary it reappears

    I didn't try disconnecting the cruise module that intersects the throttle pedal wiring, nor have I tried spaying carb cleaner

    I will have to try that next but I'm not optimistic

    Randomly swapping out components would usually be my next strategy, but sadly I have no spare components!
    A vacuum leak would be the first thing to check IMO. Split or disconnected hose, cracked or sticking solenoid valve, bad o-ring on throttle body to manifold, or manifold to head etc.

  4. #14
    Join Date
    Dec 2007
    Location
    London
    Posts
    432
    Thanks for that

    I do have a Mityvac, but I'm not entirely sure how I would use it to find a leak in the Smart

    The exhaust manifold is definitely cracked so that can't be helping

    Paul
    Pure 2000 W, LHD 599cc - Engine Rebuilt Feb 08 - sold
    Passion 2000 W, LHD 599cc - Engine Rebuilt Mar 09 - sold
    Passion 1998 T, LHD 599cc - Engine Rebuilt Apr 10 - sold
    Cabrio 2001 Y, LHD 599cc - Engine Rebuilt Jul 10 Replaced Oct 16

  5. #15
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,403
    That crack is easily bad enough to cause surging. Mine was not as bad as that and I stopped the surging with this:
    https://www.ebay.co.uk/itm/Blue-Magi...QAAOSwFR5d-Q7S

  6. #16
    Join Date
    Dec 2007
    Location
    London
    Posts
    432
    Does surging typically happen only on idle?

    Mine is always totally steady when driving with any throttle at all

    I do have some QuickSteel which I could try, but I'm more likely to replace the manifold
    Paul
    Pure 2000 W, LHD 599cc - Engine Rebuilt Feb 08 - sold
    Passion 2000 W, LHD 599cc - Engine Rebuilt Mar 09 - sold
    Passion 1998 T, LHD 599cc - Engine Rebuilt Apr 10 - sold
    Cabrio 2001 Y, LHD 599cc - Engine Rebuilt Jul 10 Replaced Oct 16

  7. #17
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,403
    It will just crack again.

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