Question about 1998 Lexus ES 300

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Black smoke when car goes into high speed, also hesitation what causes this, and check engine light comes on

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  • yadayada
    yadayada May 19, 2011

    FYI
    The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
    When the Check Engine/Service Engine Soon light (Varies by make) is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.

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  • Lexus Master
  • 14,585 Answers

Black smoke is from to much fuel. You may have a bad 02 sensor. Have the codes checked first, even if the light doesn't stay on. 02 sensors are what help regulate the fuel mixture. if one or all is running lean, it is telling the computer to add more fuel. before you replace the sensor/s check for vacuum leaks. Let me know
Randy

Posted on May 20, 2011

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