Mechanics

WHAT DOES THE FLASH CODE 3-4 MEAN FOR

1991 Mercury Capri • 150,000 miles

What does the flash code 3-4 mean for 1991 mercury capri
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Jonathon
February 26, 2012.




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.



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