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Thread: How often do you clean/adjust spark plugs?

  1. #1
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    How often do you clean/adjust spark plugs?

    I was cleaning my spark plugs today and decided to check the gap and adjust as necessary. How often do yall do that with your Abarths? I found 2 plugs well beyond spec at .034", the other 2 were a little loose for my liking at .26", and I had previously set them at .022". That tells me to check way more often than every 10,000 miles. I put them all back at .020" this time and the car runs significantly better.
    Well, that's just fantastic.
    Madness 500 gen1 piggyback ECM
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    Senior Member Trunkout's Avatar
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    Honestly I’m afraid to check again....
    2013 Rosso Abarth 5spd Bianco 17s
    "It feels like you have no suspension! Why does it explode when you shift?
    IS YOUR CAR ILLEGAL??" ~ My Mom

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    Quote Originally Posted by Trunkout View Post
    Honestly I’m afraid to check again....
    Which pretty much means you need to I think.
    Well, that's just fantastic.
    Madness 500 gen1 piggyback ECM
    Madness 500 gopedal
    Madness 500 Maxfire ignition coils
    SIKR9A7 gapped at .5mm(0.1969inches)
    Cat delete downpipe
    Magnaflow Sport Series 15211 exhaust
    Cold air intake piped to behind driver's side headlight
    FMIC
    17x7" Sparco wheels
    Drilled and slotted big brake rotors front & back
    Steel braided brake lines front & back
    Front top brace and bottom anti-roll bar
    Back torsion bar
    Lowering springs by Neu-F

  4. #4
    The change interval is 30,000 miles, so I bet most people don't check and adjust the plugs. If you are heavily modified, I guess checking them occasionally wouldn't be a bad idea, based on your findings. Like anything else, the harder you push a car, the more maintenance it needs. I imagine that high energy coils may contribute to gap erosion, too. What plugs did you use?

    abarth500forum.com fiat124spiderforum.com fiat500lusaforum.com fiat500xforum.com

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    Senior Member Trunkout's Avatar
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    Quote Originally Posted by Fantastic View Post
    Which pretty much means you need to I think.
    Last time I checked I found oil soaked on piston 1’s plug.... and Fiat said it was normal....
    not sure I wanna go down that road again....
    2013 Rosso Abarth 5spd Bianco 17s
    "It feels like you have no suspension! Why does it explode when you shift?
    IS YOUR CAR ILLEGAL??" ~ My Mom

  6. #6
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    I replaced mine after less than 25k KMS, and found a substantial improvement in general performance/responsiveness. I was quite surprised with the results. This leads me to believe that the interval given for replacement needs to be taken with a grain of salt.


    Quote Originally Posted by Fiat500USA View Post
    The change interval is 30,000 miles, so I bet most people don't check and adjust the plugs. If you are heavily modified, I guess checking them occasionally wouldn't be a bad idea, based on your findings. Like anything else, the harder you push a car, the more maintenance it needs. I imagine that high energy coils may contribute to gap erosion, too. What plugs did you use?

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    Quote Originally Posted by Fiat500USA View Post
    What plugs did you use?
    SIKR9A7. They run better than any others I have tried.
    Well, that's just fantastic.
    Madness 500 gen1 piggyback ECM
    Madness 500 gopedal
    Madness 500 Maxfire ignition coils
    SIKR9A7 gapped at .5mm(0.1969inches)
    Cat delete downpipe
    Magnaflow Sport Series 15211 exhaust
    Cold air intake piped to behind driver's side headlight
    FMIC
    17x7" Sparco wheels
    Drilled and slotted big brake rotors front & back
    Steel braided brake lines front & back
    Front top brace and bottom anti-roll bar
    Back torsion bar
    Lowering springs by Neu-F

  8. #8
    Moderator Robert Nixon's Avatar
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    I replaced mine with stock plugs at around 33,000, no problems since, haven't checked, so at 60K I'm due for another change.
    2013 Rosso Abarth with 59K miles, Neu-f rear sway bar, EBC Yellowstuff brake pads, DOT4 brake fluid, K&N air filter, autocross 17 inch Ciao Milano wheels with Bridgestone Potenza RE71R, daily wheels stock 16 inch Dunlop DZ102. 2017 1st place HS Tidewater Sports Car Club: 2016+2015 1st Place TSCC GS class; 2014+2013: 2nd place in SCCA South Carolina Region G Stock.
    My Car blog: http://www.nms-racing.net/

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    Member 500's Avatar
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    On this; I think cold starts and driving style need to be taken into account, as well as how much oil the car tends to consume. My car is thirsty with the oil and I suspect it has a lot to do with alpine living and cold morning starts. I changed my plugs around 32k mi and they were destroyed. The electrodes were covered in deposits and the gap was out of spec. The new plugs made a massive difference in performance and fuel economy. like an easy 5mpg/ average difference per tank.

    It's $60 and 45 minutes to do, so I'm going to do them every 20k mi or maybe less if I see fuel economy fall off.

    - Julie
    2015 500 Turbo 5mt
    2013 500 Pop 5mt

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