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2005 Mercury Mariner Question: Will not go faster than 35 mph, emission light on also



jb31fantlf, Oelwein, IA, November 17, 2011, 21:49

The emission light has been on for a while, then one day, was at highway speed, slowed to 35 mph an would not go faster.

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  • Answer #1

    November 18, 2011, 10:27

    have the cat converter check for back pressure failure and have the fuel pressure checked.

    this is why it is an issue with leaving on the check engine light for a long period of time. we always recommend repairing the car when the light comes on as more damage may result not attending to it at the time of failure.


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