Secondary fuel control

talonhead

Registered User
Bought an AUTOXRAY 5000 scanner to help diagnose the missing on my Superduty V-10 and for S&G's downloaded the codes on my '93 and I was suprised with only one callout. It called out secondary fuel control circuit. What does this mean? Car runs fine, but the heater core went right after I scanned, it's back in the garage with the dash removal in progress.
 
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