Throttle Position Sensor

On E2ME carburetors, use a 5/64" drill bit to drill a hole in the steel cup plug covering the TPS adjustment screw. See Fig 1 . Do not damage adjustment screw head.
On all models, unplug TPS connector. Jumper all 3 sensor terminals to harness. Connect a high impedance digital voltmeter to TPS terminals "B" and "C".
With ignition on and engine stopped, A/C off, and throttle in specified position, turn TPS adjusting screw until correct voltage is reached. Remove jumpers and reconnect harness.

TPS ADJUSTMENT VOLTAGE

Application

Voltage

Throttle Position

2.8L MFI (VIN S)

.55

Idle

2.8L MFI (VIN W)

.55

Idle

2.8L MFI (VIN 9)

⁽¹⁾

N/A

3.0L MFI (VIN L)

LeSabre & 88

.40

⁽²⁾

All Others

.55

⁽²⁾

3.8L 2-Bbl. (VIN A)

.46

Idle

3.8L SFI (VIN 3 & 7)

.40

⁽²⁾

4.3L TBI (VIN Z)

⁽¹⁾

N/A

⁽¹⁾	Not adjustable.

⁽²⁾	Set with IAC extended and at base idle RPM.

Fig 1: E2ME Idle Air Bleed Valve Location

Fig 2: Idle Air Bleed Valve Adjustment (Remove Gauge To Complete Adjustment On Vehicle)