Section 7 - Ignition Timing, Idle Speed, C.O Adjust

7. IGNITION TIMING, IDLE SPEED AND CO CONTENT, CHECKING/ADJUSTING

- Read DTC memory to check for the possibility of stored DTC's.

- Repair as necessary to eliminate any malfunctions and then erase DTC memory

CAUTION
Stored DTC's MUST be corrected and then erased from memory at this point or the following check and adjustment could be affected.

Requirements

^ Engine oil temperature 80°C (176°F) minimum

^ All electrical consumers switched OFF

^ Do NOT take measurements while engine coolant fan is running

^ A/C switched OFF

^ Idle Air Control valve OK (with ignition switched ON, the Idle Air Control valve MUST vibrate and hum)

^ Exhaust system MUST be leak-tight

- Connect SUN 105 (or EPA approved equivalent) with Special Tool 6006-0019

^ CO tester adaptor must be securely attached to tap tube to prevent measuring errors due to dilution or leakage

IGNITION TIMING, CHECKING/ADJUSTING




- Connect VAG 1367 engine tester using inductive pickup VAG 1367/8

- Start engine and let idle




- Disconnect blue Engine Coolant Temperature (ECT) sensor harness connector (arrow) - Raise engine speed between 2000 and 2500

- Observe ignition timing (displayed directly on VAG 1367)

^ Check value: 4 to 8° BEFORE TDC If NO, adjust as follows:

- Loosen distributor base clamp

- Adjust ignition timing by rotating distributor.

^ adjusting value: 6 +/- 1 BEFORE TDC

- Raise engine speed between 2000 and 2500 RPM

- Re-tighten distributor base clamp and re-check timing; correct if necessary

^ 25 Nm (18 ft. lb)

- Reconnect blue ECT sensor harness connector

Disconnecting the ECT sensor generates DTC code 2312 which must be erased AFTER checking/adjusting is completed

IDLE SPEED AND CO CONTENT CHECKING/ADJUSTING

- Observe idle speed and CO content on test instruments

- Record CO value on repair order before adjustment

^ Idle speed: 750-850 RPM
^ CO content: 0.3 to 1.2 volume %

If NO, adjust as follows:

- Switch OFF ignition

- Remove breather hose from positive - crankcase ventilation valve (arrow) and plug hose

- Start engine and let idle




- Disconnect blue Engine Coolant Temperature (ECT) sensor harness connector (arrow 2)

- Reconnect after 1 minute

^ Engine coolant fan must NOT be running while reconnecting

- Reconnect breather hose
- Read DTC memory then erase Disconnecting the ECT sensor generates DTC code 2313 which must be erased AFTER checking/adjusting is completed

- Recheck idle speed and CO content

^ Idle speed: 75-50 RPM
^ CO content: 0.3-1.2%