base AFR settings ?
Rennlist Member
Joined: Apr 2004
Posts: 10,138
Likes: 74
From: Central Ohio
Adjusting Requirements:
Engine in perfect mechanical condition. Electric equipment switched off during adjustments. Adjustments made as quickly as possible to prevent heating up the intake ports and consequently causing wrong CO values.
1. Run engine to operating temperature (oil temperature 80 to 90º C). Use Special tools 9122 = 9122/1 to check oil temperature: 15 to 30º C.
2. Disconnect oxygen sensor plug and connect CO tester according to supplier’s instructions.
3. Install Special Tool US 4492 on CO testing pipe.
Note It is recommended to use the test connection in area of air cleaner housing, if there is suspicion of erratic engine running or when troubleshooting.
CO testing pipe for cylinders 1-4 is on righthand side, or lefthand side for cylinders 5-8.
4. Check CO. If CO level deviates from specified value, correct the adjustment on air volume sensor. Use special tool 9230 CO adjusting value: 0.6 + 0.2% Turned clockwise –richer mixture
Turned anticlockwise –leaner mixture.
Note If the CO level has to be corrected on the air volume sensor, remove plug in bore affording access to the idle speed CO adjusting screw after removal of the air volume sensor.
5. Connect oxygen plug and insert plug in CO testing pipe after finishing adjustments.
After this you need to set the idle speed. If you don't have a CO meter and or you've removed the CO testing pipe you can check A/F before the catalytic converter instead.
Engine in perfect mechanical condition. Electric equipment switched off during adjustments. Adjustments made as quickly as possible to prevent heating up the intake ports and consequently causing wrong CO values.
1. Run engine to operating temperature (oil temperature 80 to 90º C). Use Special tools 9122 = 9122/1 to check oil temperature: 15 to 30º C.
2. Disconnect oxygen sensor plug and connect CO tester according to supplier’s instructions.
3. Install Special Tool US 4492 on CO testing pipe.
Note It is recommended to use the test connection in area of air cleaner housing, if there is suspicion of erratic engine running or when troubleshooting.
CO testing pipe for cylinders 1-4 is on righthand side, or lefthand side for cylinders 5-8.
4. Check CO. If CO level deviates from specified value, correct the adjustment on air volume sensor. Use special tool 9230 CO adjusting value: 0.6 + 0.2% Turned clockwise –richer mixture
Turned anticlockwise –leaner mixture.
Note If the CO level has to be corrected on the air volume sensor, remove plug in bore affording access to the idle speed CO adjusting screw after removal of the air volume sensor.
5. Connect oxygen plug and insert plug in CO testing pipe after finishing adjustments.
After this you need to set the idle speed. If you don't have a CO meter and or you've removed the CO testing pipe you can check A/F before the catalytic converter instead.
