VR6 Ignition Timing
- Start and warm engine to normal operating temperature. Ensure engine oil temperature is 176°F (80°C). Ensure A/C and electrical loads are off, including cooling fan.
- Connect engine analyzer to engine. Connect Scan Tester (VAG 1551) to Data Link Connectors (DLC) located in center console, in front of shift lever. Ensure no Diagnostic Trouble Codes (DTC) are stored.
- Ensure throttle position sensor is properly adjusted. Ensure idle air control valve is okay. Valve must vibrate or hum. Connect CO tester using Adapter (VAG 1363/3) on CO tap tube. DO NOT remove oxygen sensor. Ensure exhaust system has no leaks.
- Start engine and let it run at closed throttle (less than 1500 RPM). Operate scan tester and observe display. Press "1" button to select RAPID DATA TRANSFER function. Press "Q" button to enter input. Press right arrow button.
- Press "0" and "1" buttons to select ENGINE ELECTRONICS function. Press "Q" button to enter input. Press right arrow button, then "0" and "4" buttons to select BASIC SETTING function. Press "Q" button to enter input.
- Press "0" and "1" buttons to select INPUT DISPLAY GROUP NUMBER 01. Press "Q" button to enter input. Scan tester will display SYSTEM IN BASIC ADJUSTMENT 1 through 4. Briefly increase engine speed and then let it run for 2 minutes at closed throttle. Scan tester displays idle speed in field one and ignition timing in field four. Check CO level on CO tester.
- When radiator cooling fan stops running, end basic setting function by pressing right arrow button. Press "0" and "6" for END OUTPUT function. Press "Q" button to enter input.
- If idle speed, CO level or ignition timing is incorrect, turn ignition off. Check accelerator pedal and throttle cable for ease of operation. Check dashpot adjustment. Check throttle position sensor, idle air control valve, and EGR valve.