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service engine soon light came on

Discussion in 'Chevy Trucks' started by mdchest, Nov 22, 2003.

  1. mdchest

    mdchest Junior Member
    Messages: 24

    Yesterday when i got of the interstate going about 80 miles per hour i noticed that my service engine soon light came on , about a year ago it came on and i had to replace the catalic converter, I have read alot of different things about this and could someone tell me if they have had the same prob..should i go and buy gas treatment for it or could there be a serious problem with my 98 chevy silverado. I cannot feel anything different,,the truck idles fine,but i have noticed that my gas milage isnt the best, but hey its a 1/2 ton truck LOL. thank you for your replies i appreciate it.
     
  2. Crash935

    Crash935 2000 Club Member
    Messages: 2,377

    Stop by the auto parts store and pick upj the Chiltons Reapir guide for your truck, it will tell you under the emissions section on how to check the computer for trouble codes.

    Auto Zone will also check with a scanner for free.
     
  3. mdchest

    mdchest Junior Member
    Messages: 24

    i went to autozone and it got a code of po442 a small leak in the EECS. Does anybody know how i can find the leak. Thank you for all your help :)
     
  4. BigRedBarn

    BigRedBarn Senior Member
    Messages: 133

    With later model GM's, if the gas cap isn't tight (clicks when tightened) the "Check Engine" light will come on.

    I hope I'm not stating the obvious here, as I think most GM owners are aware of this.

    If the gas cap is clicking when you install it and you still get the light/code, maybe the gas cap is not working as designed, such as maybe the seal (O-ring?) is old and leaky and needs replacement???

    Just my 2¢.
     
  5. 86burban

    86burban Senior Member
    from chicago
    Messages: 130

    O2 sensor(s) could be bad. When they begin to go, they set off the light above 45 or so. Thats how they were 10 years ago, I could be wrong.

    Tony
     
  6. easthavenplower

    easthavenplower Senior Member
    Messages: 282

    i sAID try the gas cap but somebody erased my reply