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94 marquis pinging with 87 octane

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    94 marquis pinging with 87 octane

    due to the crazy gas prices ive worked my way down from running 93octane down to 87 but im getting pinging on merging and passing acceleration. i have no codes showing. im guessing that the EGR flow is blocked by carbon buildup in the passages. how much is it gonna cost to have my mechanic clear out the passages?

    #2
    labor+shop fee+ cleaning stuff, around 90 bucks. Take it off and clean it yourself. You'll save money. BTW was it pinging before you started using 87?

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      #3
      didnt ping with 93 or 91 it pinged on 89 but only during 75% and up throttle

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