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check engine light/gas milage??

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Old 02-19-2009, 11:18 AM   #1
rgh953 [OP] rgh953 is offline
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check engine light/gas milage??

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!!
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Old 02-19-2009, 11:28 AM   #2
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try disconnecting the battery. It will re-boot the ECU which would reset four air/fuel mixture
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Old 02-19-2009, 12:37 PM   #3
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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?
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Old 02-19-2009, 01:00 PM   #4
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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.
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Old 02-19-2009, 01:02 PM   #5
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thank you!
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