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Thread: 2014 CX-5 Touring (2.5L) has hiccup and no longer smooth in slow traffic

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    2014 CX-5 Touring (2.5L) has hiccup and no longer smooth in slow traffic

    My 2014 CX-5 has 70K miles. I have only ever changed oil and air, cabin filters along with tires and wipers. No other work done (good job Mazda)!

    However, now the car doesn't feel smooth. It seems to jerk and lunge forward in stop-n-go traffic especially even after engine is warm. I press the gas pedal and many times it seems to think for a moment and then go or even when I am slowing down or braking, the engine doesn't seem to run smooth.

    I am in busy San Francisco Bay Area and was in Dallas Texas earlier. I am guessing it is time for new spark plugs but don't know for sure. What else could I/should I get done? I would like to use a local mechanic and not go to the dealer as my financial position is just OK these days. I should note that the gas mileage has come down by 1-3 mpg over the last 1-3 years now. I used to get more than 30 mpg but now get about 27-29 only. Also, there are no codes via an OBDII scantool that I plugged in.

    Thanks for your suggestions. Also, how much would it be to get fuel injection cleanup done and then new spark plugs installed? I don't think I can do this work myself, correct (I haven't ever worked on cars before but willing to learn if not super tough for a newbie).
    Last edited by agaurav; 07-13-2019 at 07:32 PM.
    Fuelly

  2. #2
    Registered Member CX-5um's Avatar

    13' CX-5 and 16' Mazda6 both Touring w/Tech/Bose

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    You did not mention the engine filter (not to be confused with cabin filter). Was that ever changed?

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    Coil or plug, or vacuum leak, or PCV system are where I'd start, in that order

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    Quote Originally Posted by CX-5um View Post
    You did not mention the engine filter (not to be confused with cabin filter). Was that ever changed?
    Thanks. Actually that is what I meant by "air filter" when I wrote "air, cabin filters", The air was the engine air filter. I did get a brand-new OEM from Mazda dealer and installed it myself.
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    Quote Originally Posted by Unobtanium View Post
    Coil or plug, or vacuum leak, or PCV system are where I'd start, in that order
    Thanks a bunch. Is that something that I can debug or do I go to a mechanic and ask them to check these? How do I know about vacuum leak etc.? Thanks.
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    Quote Originally Posted by agaurav View Post
    Thanks a bunch. Is that something that I can debug or do I go to a mechanic and ask them to check these? How do I know about vacuum leak etc.? Thanks.
    I think vac leak is pretty low on the list. Dealer should be able to run diagnostic on coil pack.

  7. #7
    Registered Member erhayes's Avatar
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    Spark plugs are due at ~ 75,000 miles so that is the first thing I'd do if you have no CELs. Ed

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    Quote Originally Posted by erhayes View Post
    Spark plugs are due at ~ 75,000 miles so that is the first thing I'd do if you have no CELs. Ed
    I did mine at 85K or so as I recall and it was the big waste.

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    Opposite experience from Unobtanium. Replacing my spark plugs at 6 1/2 years of age and 60k smoothed a slightly rough idle for me. Plug tips looked fine but I don*t know if their resistance/electrical properties had degraded.

    Do you use better gas (I.e top tier shell, bp, etc)? I wonder if the injectors are fouling up.

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    Quote Originally Posted by ruthrj View Post
    Opposite experience from Unobtanium. Replacing my spark plugs at 6 1/2 years of age and 60k smoothed a slightly rough idle for me. Plug tips looked fine but I don*t know if their resistance/electrical properties had degraded.

    Do you use better gas (I.e top tier shell, bp, etc)? I wonder if the injectors are fouling up.
    Injectors are at several thousand PSI. Not likely, no? Or is that a thing?

  11. #11
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    I do try to use top tier Shell most of the time but at least 20% of the times it will be some generic pump due to long distance travel or something which happened to be near when I needed gas.

    Is there a fuel injector cleaner service that I should ask the mechanic or just throttle body cleanup alongside MAF clean?

    Quote Originally Posted by ruthrj View Post
    Opposite experience from Unobtanium. Replacing my spark plugs at 6 1/2 years of age and 60k smoothed a slightly rough idle for me. Plug tips looked fine but I don*t know if their resistance/electrical properties had degraded.

    Do you use better gas (I.e top tier shell, bp, etc)? I wonder if the injectors are fouling up.
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  12. #12
    Registered Member erhayes's Avatar
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    I have used TECKRON COMPLETE SYSTEM CLEANER in my 2014 CX5 before each oil change. In addition a careful MAF cleaning would be in order. This together with a spark plug change. Ed

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    I would inspect the spark plugs. If the gap is out of spec or they are dirty, you can try regapping them or cleaning them. If that doesn't help, in my opinion take it to the dealer or good mechanic so you don't keep guessing at what parts to change. If you take it to a dealer don't have them do any extra work unrelated to your issue, those extra things are what you can do as a DIY person or bring the car back at a later date.

  14. #14
    Gen-1 Kodo Design 👌 ColoradoDriver's Avatar
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    You mentioned the car doesn't feel smooth. Tranny feel...off?
    2014 CX-5 Touring AWD 2.5L | Jet Black Mica - 84k miles
    01/2013 build | 4/20/2013 delivery

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    Thanks all. I am humbled with just a supportive and welcoming community. The tranny doesn't feel off. Feels more like engine - like a bit sticky gas pedal.

    I am handy around the house and have worked on minor electronics and computer repair but nothing big. Never worked on cars before other than changing engine air filter, cabin air filter, battery change and an occasional tire change. Would you folks advise me to try doing the throttle body and MAF sensor cleanup myself? Or just take to a mechanic and ask for these items?

    Thanks.
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