G 30 1 Ton Van L6-250 4.1L VIN D 2-bbl (1983)
Throttle Position Sensor: Adjustments
Rochester Varajet 2SE & E2SE Series
Do not remove plug sealing TPS adjustment or adjust TPS unless carburetor is overhauled or ``Computer Command Control (C3)" system diagnosis
indicates a problem with the switch.
1. Drill a 5/64 inch hole, 1/16 to 1/8 inch deep, in plug covering TPS adjustment screw.
2. Thread a small slide hammer or equivalent into plug and remove plug from air horn.
3. Disconnect TPS connector and jumper all three terminals.
4. Connect digital voltmeter J-29125-A or equivalent to center and bottom terminals of connector.
5. With ignition On and engine Off, turn TPS adjusting screw to obtain .26 volts.
6. Turn ignition Off and install a new plug over TPS adjusting screw or seal opening with RTV sealer.
