what does the flash code 3-4 mean for 1991 mercury capri

1991 MERCURY CAPRI
150,000 MILES
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JONATHON
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what does the flash code 3-4 mean for 1991 mercury capri
Feb 26, 2012 at 6:09 PM
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DRCRANKNWRENCH
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That translates to "Idle Speed Control". More than likely the Idle Air Control Valve, IACV, has failed. It is generally located on the intake manifold near the throttle body.
Feb 26, 2012 at 6:18 PM
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