Disconnecting O2 Sensor Porsche 928 L-jetronic

ADJUSTING IDLE - USA and Japan (from 19 80 Models with L-Jetronic)

Remarks Requirements:

Engine in perfect mechanical condition and ignition timing adjusted correctly.

1. Fold up foot support in footwell of passenger's side and disconnect oxygen sensor plug.

3. Run engine to operating temperature (oil temperature approx. 80 C). Use special tool US 8025.

4. Connect CO tester to supplier' s instructions.

5, Turn control screw or bypass screw on throttle housing until specified speed is reached.

2. Connect CO test line US 8023 or SUN 120-239 on test connection of catalytic converter.

Remarks Requirements:

Engine in perfect mechanical condition and ignition timing adjusted correctly.

1. Fold up foot support in footwell of passenger's side and disconnect oxygen sensor plug.

3. Run engine to operating temperature (oil temperature approx. 80 C). Use special tool US 8025.

4. Connect CO tester to supplier' s instructions.

5, Turn control screw or bypass screw on throttle housing until specified speed is reached.

Use separate tachometer of tester or similar.

Make adjustments as quickly as possible to avoid excessive heat in intake ports and consequently wrong CO values.

6. Adjust fuel/air mixture. Guide special tool 9187 into adjusting bore of air flow sensor and turn mixture control screw accordingly.

7. Turning clockwise = richer mixture. Turning anticlockwise = leaner mixture.

8. After finishing adjustment reconnect the oxygen sensor plug.

9. Coat threads of plug for test connection on catalytic converter with Bosch Paste VS 140 16 Ft or Optimoly HT.

ADJUSTING IDLE SPEED AND CO - USA AND JAPAN (Beginning with 1983 Models - L-Jetronic)

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