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rough idel trouble codes

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Old Jul 16, 2010 | 04:29 PM
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rough idel trouble codes

its a 2003 with a 4.6, it has a rough idel and the codes are.. P0171 and P0174, fuel system too lean (cylinder bank 1/2)?? any ideas
thanks =]
 
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Old Jul 16, 2010 | 10:15 PM
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This is very often an air leak through a bad hose somewhere on the intake manifold.
The only way the system has to ID the fault is by the OX sensors.
They shift the fuel tables trying to account for the extra air.
When the tables are shifted out of normal range, the codes are set.
The trick is to know the dynamic operation, because the codes do not tell you what part is faulty.
Good luck.
 
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Old Jul 21, 2010 | 09:39 AM
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found it. thank you =]... does anyone know where the cabin air filter is in this truck??
 
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