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-   -   20k Mileage Switch (https://www.nopistons.com/3rd-generation-specific-18/20k-mileage-switch-29037/)

amp 11-20-2003 02:37 PM
found on either f175 or f189 on the shop manual..

someone help me understand what thats for...

turbovr6 11-20-2003 03:29 PM
yeah I remember reading about that in the manual. I believe it has something to do with the ECU and emissions system. It's a one time deal. At the pre-determined milage the switch either opens or closes for good. There are a few carmakers that have a similar system, allthough none of their manuals actually explain their purpose either

amp 11-20-2003 03:58 PM
some have indicated that its the break-in safe mode switch..

where the ecu will run rich up until 20k then switch to optimum a/f for more hp..

i cant find it anywhere in the manual that will substantiate this claim..

j9fd3s 11-20-2003 06:21 PM
Originally Posted by amp' date='Nov 20 2003, 01:58 PM
some have indicated that its the break-in safe mode switch..

where the ecu will run rich up until 20k then switch to optimum a/f for more hp..

i cant find it anywhere in the manual that will substantiate this claim..
yeah thats what ive heard. we do know that the switch turns on part of the acv, i have no idea why



mike


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