vacuum leak?

2003 FORD EXPEDITION
138,000 MILES
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EMT_LINZ7
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2003 expedition, has had catalyst codes for awhile, as well as bank 1 and 2 too lean. Nasty smelling exhaust, jumps while idiling at drive through etc from 500-1000 rpms, gas mileage sucks. also has humming noise from deep in engine compartment. Shop thinks they found vacuum leak and are replacing purge solenoid, want to make sure this is truely it and im not being taken for a ride, could this really be as simple as that.... thoughts?

been told by several shops need to replace engine, this guy says not the case, quite often mistaken for needing engine replacement
Mar 2, 2012 at 4:31 PM
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RASMATAZ
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Lean fuel condition could be caused by one of the following below:

1.Vacuum leaks

2.EGR and PCV valve.

3.Low fuel pressure.

4.Dirty fuel injectors.

5.Mass Air Flow Sensor.

6.Oxygen Sensor.
Mar 2, 2012 at 4:39 PM
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EMT_LINZ7
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so could changing out the purge solenoid be the fix?
Mar 2, 2012 at 4:45 PM
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RASMATAZ
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What are the exact code/s ?
Mar 2, 2012 at 4:48 PM
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EMT_LINZ7
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i dont remember numbers now, i think p0420 was for catalyst, not sure of the bank 1 too lean and 2 too lean codes
Mar 2, 2012 at 4:50 PM
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RASMATAZ
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Have the catalytic converter and oxygen sensors-checked/tested
Mar 2, 2012 at 4:52 PM
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EMT_LINZ7
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yes, spent $85 getting those checked by exhaust shop...said nothing wrong...egr valve has been replaced, spark plugs, a vacuum line, 1 o2 sensor and 1 converter.
Mar 2, 2012 at 4:55 PM
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RASMATAZ
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Check the rest on my 1st suggestion and then comeback with results
Mar 2, 2012 at 4:58 PM
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RCFOOTE19
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Were you able to find a solution, as I have similar problem and have tried same things and stalling still occurring.
Apr 19, 2012 at 3:08 AM
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