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Stumbling when cold
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Thread: Stumbling when cold

  1. #1
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    Question Stumbling when cold

    Happy New Years fellow FIAT owners.
    My 2013 Abarth 500 with 60K has suddenly started having this stumbling / hesitating issue driving after sitting overnight.
    It only happens when the engine is completely cold, then I start it and it is warming up, in the first mile.
    Issue goes away after that and does not happen on cooled off or warm restarts.
    Plugs were replaced at 30K service interval.
    No modifications have been done to the engine.
    My code reader shows no error codes.
    The check engine light has not come on.
    Thanks for any suggestions.

  2. #2
    Moderator map's Avatar
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    If it were me and the plugs weren't replaced a second time, I'd try dropping in a set. The tear down might give a clue as to what's wrong; failed plug, oil in the plug holes, dirty air filter, PCV fail, etc. Otherwise, I'd put it on a scanner to help diagnose the problem. It could be something as simple bad fuel or a dirty throttle body.

    My '18 stumbled a bit when weather got below freezing. I refueled and it cleared up... but weather was above freezing again.

  3. #3
    Senior Member smark's Avatar
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    Dirty fuel injectors, run some fuel injector cleaner in the tank, at your next fill up.

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    Check basics, too. Clean oil and up to the proper level. Dirty oil, wrong viscosity, low oil level could cause misfires in a MultiAir engine. What oil change intervals do you follow and how is the car used?
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  5. #5
    Fiat Top Care Specialist FiatCares's Avatar
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    Quote Originally Posted by 2013Abarth View Post
    Happy New Years fellow FIAT owners.
    My 2013 Abarth 500 with 60K has suddenly started having this stumbling / hesitating issue driving after sitting overnight.
    It only happens when the engine is completely cold, then I start it and it is warming up, in the first mile.
    Issue goes away after that and does not happen on cooled off or warm restarts.
    Plugs were replaced at 30K service interval.
    No modifications have been done to the engine.
    My code reader shows no error codes.
    The check engine light has not come on.
    Thanks for any suggestions.
    Hello 2013Abarth,
    We certainly understand why this would be concerning! If you're not able to determine a solution based on suggestions from fellow forum members and you decide to address this with your dealer, please let us know via private message. We would be more than happy to provide you with an additional layer of assistance for that process.
    Laura
    FiatCares

  6. #6
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    The symptoms point to dirty fuel injectors or maybe a failing coil pack.
    The oil was changed 5,500 miles ago.
    The car gets street use, commuting to work (14 mile trip).
    Fuel injector cleaner will be the first thing to try out.
    I'll respond back when I figure it out.
    Thanks!
    Last edited by 2013Abarth; 01-02-2020 at 05:02 PM. Reason: additional information

  7. The Following 2 Users Say Thank You to 2013Abarth For This Useful Post:

    Fiat500USA (01-02-2020), smark (01-02-2020)

  8. #7
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    Low battery can cause erratic behavior after a heavy draw cold weather start, and clear up once the battery has recovered. Clean and secure your battery connections and check itís load capacity. A fouled connection will reduce charge rate and you may be ending your day with a somewhat depleted battery, which could be draining more overnight in the cold, and more once cranked to start.

    Plug gap can be worn out of range, and vary by cylinder. If there are signs of moisture or oil contamination in plug wells, clean that and use di-electric grease at install of new plugs on the coil pak boot to cover interfaces and the terminal end at plug, and wire connector at the coil. Look for any carbon tracking.
    Last edited by pasomoto; 01-02-2020 at 04:37 PM.

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    2013Abarth (01-02-2020), Fiat500USA (01-02-2020), smark (01-12-2020)

  10. #8
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    I'm in central Florida so cold weather isn't a factor.
    This occurs when the car has sat for more than 24 hours, not "cold" as in cold weather.
    75 degree weather and it still does it.
    The battery was replaced 18 months ago.
    I added Lucas Fuel Injector cleaner, then filled the tank tonight.
    Last edited by 2013Abarth; 01-03-2020 at 12:23 AM.

  11. #9
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    If the plugs were only changed once. Change the plugs.


    2015 Fiat 500 Abarth
    Power:V4.1 Intake, Forge BOV, EC FMIC, 4C coils, Tork Beta Tune, ATP downpipe, Boost Leak Fix, Turbosmart WGA
    Handling: H&R 5mm spacers, El Gato Front Braces, Tork Rigid Collars, Fat Cat Motorsports Revalved Bilsteins, CPR lower brace, Fat Cat Bump Stops
    DSP/D-class (local club classing)
    #notscare

  12. #10
    Lifetime Member Lifetime Member Saponetta's Avatar
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    Agreed. You need to throw in new plugs to even get a baseline. But I wouldnt be suprised if you found leaky plug well grommets when u changed them.....
    2013 abarth
    Spec 2+ clutch
    Working on new divided turbo setup
    Homebrew fmic w/ corsa forza hoses
    Stock Downpipe with cat and 2.25discharge
    Coils
    Homemade cowl intake
    ECB yellows/stop tech fluid
    Koni/vogtland
    Braces and strut mounts
    Corsa forza vento
    E30 blend

    2013 abarth tork tuned
    cowl intake, custom fmic and bypass valve, vogtlands, rear vette bilstiens, long 3 inch downpipe to stock rear section.

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