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Dealer Changed plugs and wires and now runs rough??

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This topic contains 3 replies, has 2 voices, and was last updated by Nightflyr * Richard Kirshy 4 months, 3 weeks ago.

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  • #987168
    Charles Craven
    Charles Craven
    Participant

    I have a 2012 Avalanche that the dealer just did the plugs and wires on as well as a fuel system cleaning. It is now running more rough compared to before. Even more so when cold and gets a little better when warmed up, but still more shake compared to previously being serviced. No codes are showing as i took it back and they did not see any issues. I drove it a few weeks and took it back again as it is quite a bit different in the smoothness. Any thoughts on what would cause it and not show up on codes or their computers? They have it again now and i am going to go and drive it with them to better explain.

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  • #987169
    Nightflyr *
    Richard Kirshy
    Participant

    Unless some other issue has arisen.
    Could be faulty gaped plugs
    Incorrect plugs
    Incorrect wires
    When you say fuel system cleaning do you mean injector cleaning or from the fuel tank forward?
    One other item to note:
    Is this a flex fuel vehicle? if so have them make sure the sensor is reading the correct amount of ethanol being used.

    #987171
    Charles Craven
    Charles Craven
    Participant

    this is not a Flex. They did the injector cleaning i believe. If a incorrect plug, wire or bad gap, would it not show? The computer shows it firing.

    #987173
    Nightflyr *
    Richard Kirshy
    Participant

    The on board diagnostics will show an issue providing the issue is out of the operational parameters.

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