Mechanics

MASS AIRFLOW SENSOR

1983 Jaguar XJ6

Electrical problem
1983 Jaguar XJ6 6 cyl Two Wheel Drive Automatic 150000 miles

Sometimes my car wont start unless I turn the key on and open the flap in the airflow meter to get fuel pumping to the engine.I have to open the flap by hand for a couple seconds. Brand new fuel pump. Suggestions? Sid.
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Sidsbeach
March 13, 2010.




IDLE MIXTURE
NOTE: Mixture adjustment is not a part of normal tune-up procedure. It should not be performed unless fuel injection parts are replaced or vehicle fails emissions testing.

Connect special tools (BLT 1044 & 1047) to exhaust downpipe test points. With engine idling at 800 RPM, disconnect oxygen sensor and allow 1 minute for engine to stabilize.
Using an infrared analyzer, check CO reading. Reading should be 0.5-1.5%. If not, adjust by turning mixture adjusting screw on air flow meter housing.
Turn mixture screw clockwise to enrich mixture and counterclockwise to lean mixture. If correct setting cannot be attained, check that all electrical connections and all hoses are in good condition and properly located.
Replace oxygen sensor lead and disconnect test instruments.

Dave H
Mar 14, 2010.


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