YEP EASY FIX CHECK FUSES TO AIR PUMP VACUUM SOLENOID.CHECK VACUUM HOSES AND VACUUM SOURCE TO THE AIR PUMP VACUUM SOLENOID .THE AIR PUMP VACUUM VALVE SOLENOID IS NORMALLY CLOSED NO VACUUM IS APPLIED TO THE CHECK VALVE. WHEN THE PCM ENERGIZES THE SOLENOID BY COMPLETING THE CIRCUIT TO GROUND. THE VALVE OPENS VACUUM IS APPLIED TO THE CHECK VALVE. THE CHECK VALVE OPENS AND AIR FLOWS THROUGH THE TUBE INTO THE EXHAUST MANIFOLD. THREE THINGS WILL CAUSE SECONDARY AIR PUMP PROBLEMS.THE SECONDARY AIR PUMP IS BAD.OR THE AIR PUMP VACUUM SOLENOID NOT GETTING VACUUM OR POWER.OR THE CHECK VALVE TO EXHAUST MANIFOLD NOT OPENING.IF YOU HAVE FAULTY SECONDARY AIR PUMP IT WILL MAKE SQUEALING NOISE AIR PUMP GETTING READY TO LOCK UP.
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ok have a 2007 ford focus. 2.0l, just changed the sencondary air injection pump. still not ready for inspection where else should i look
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