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check engine light/gas milage??

Discussion in 'Technical Chat' started by rgh953, Feb 19, 2009.

  1. rgh953

    rgh953 [OP] New Member

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    I have a '01 V6 king cab 4/4 with 148,000 miles on it. The dealership just did the timing belt, water pump, belts, fuel filter, pcv valve and plugs. Truck ran great-70 miles later the check engine light came on. they said it needed a air/fuel sensor. Changed a/f sensor-light still on. faulty a/f sensor-put in new one. light still on. Dealership said now it needed a new ECU-I had my ECU refurbished(299.00). Check engine light is off but my milage has gone from 19/21 to 14 MPG. Anyone have any Ideas????????? Thank you!!
     
  2. TacoNut

    TacoNut IgnoringChrisWatchingEdLi veVicariouslyThroughMJP2

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    try disconnecting the battery. It will re-boot the ECU which would reset four air/fuel mixture
     
  3. rgh953

    rgh953 [OP] New Member

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    Are you saying flash the ECU? Lights on,disconnect the - termanal,leave off for 1/2 hr, reconnect? do all this with the lights on-ingnition off?
     
  4. HerNameIsLucy

    HerNameIsLucy I miss Lucy. :-(

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    never heard of having to have the lights on. seems kinda dangerous, the spark you'd get when you reconnect the battery terminal.

    in any case disconnect the battery for about a half an hour, reconnect it, and drive it like you normally would. be aware it's gonna act funny for a little while during its re-learing period.

    i know for sure you don't have the key on while you do this. my haynes says that alone can cook the ECU.
     
  5. rgh953

    rgh953 [OP] New Member

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    thank you!
     
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