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Print in friendly format Send this term to a friend  4L60E
Automatic Transmission - 4 Speed

1st Gear: 3.06
2nd Gear: 1.62
3rd Gear: 1.00
4th Gear: 0.70

Reverse: 2.29

- Used in production GM models...
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Re: Hunting for idle

Subject: Re: Hunting for idle
by Matatk on 2013/9/3 3:52:13

My guesses on the mpg would be just that....guesses. Have you changed anything else recently? Any stored codes? You can disconnect the battery to reset the ecm and see it that helps. Do you have a live scanner/laptop to watch it and see if it is running rich/lean? How new is your O2?
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