When the radiator fan engages at 186* my short term fuel trims on both banks skyrocket to +18. When the fan disengages at the predetermined setpoint the short term fuel trims fall back within an acceptable range. Is this normal since the alternator is putting a significant load on the system? Long term fuel trims are currently disabled. Thanks for any input.
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- Thread starter 2001Cobrabuddy
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Alternator is going out.
Will post logs when I get a chance. Why do you think the alternator is the culprit? Voltage is within range, possibly a bad voltage regulator?
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Turns out my voltage regulator was bad. Fuel trims increasing with the AC/Fans cycling on is a normal function of the system. You can watch the load parameter increase with the cycle of the Fans/AC which would account for the extra fuel being added during that time frame.
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