Question about 2003 Chevrolet Suburban

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2003 Suburban 140K miles check engine light came on. When trying to accelerate no power, boggs down and misfires. I forgot code numbers from parts store but it indicated mass air flow sensor. Installed new one with no changes. Vehicle starts fine, idles fine but no power. Air cleaner is new, I can find no obvious vac leaks. Check engine light with remain steady then will start to blink.

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  • cache_creek Aug 03, 2010

    can i check for current by checking from each sensor terminal to ground, that is, multimeter common to ground and other lead to terminal.
    Also, do codes just get you to a general area of the problem. Fuel flow seems good because of starting and idling and nothing is indicating a bad fuel pump or filter. It does have a chassis mounted can filter.

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Check the Oxygen sensors in your car...It is located on driver's side exhaust pipe next to bell housing for transmission. Unclip the wiring harness ( small hands and a screwdriver help with this step as the clip is in a tight spot between body of car and transmission. Loosen sensor with wrench ( very similar to spark splug ) and remove. Install new sensor and tighten. Insert clip on wiring harness. Not too difficult.

Posted on Aug 03, 2010

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  • Chevrolet Master
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OK, if the mass air flow sensor was changed and it didn't result in eliminating the service engine soon light, then it could be bad wiring to the mass air flow sensor.

Check for current at the sensor.

Posted on Aug 03, 2010

  • Duane Wong
    Duane Wong Aug 03, 2010

    If it's missing, the OBD-II system should isolate it to a certain cylinder (like a coil pack) or cylinders and tell you if it's a random (Like an O2 sensor would cause).

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