codes po171 po174

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Old Oct 23, 2007 | 03:06 PM
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codes po171 po174

hi i have codes po171 po174 which indicate lean on both banks.ive checked for air leaks and nothing ,drove the the truck thi s weekend and the engine started to surge,the revs were going up and down.any help please
 

Last edited by d4guk2000; Oct 23, 2007 at 03:09 PM.
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Old Oct 23, 2007 | 05:31 PM
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Click on the SEARCH button and enter "P0171 P0174" as your SEARCH keywords.

One of the most common issues areound here...

Steve
 
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Old Oct 23, 2007 | 06:24 PM
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You have a vacuum leak, read about the PCV elbow.
 
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Old Oct 24, 2007 | 03:01 PM
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Originally Posted by torkum
You have a vacuum leak, read about the PCV elbow.
thanks mate i will check the elbow.why would the engine surge.thanks darren
 
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Old Oct 25, 2007 | 07:43 AM
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Originally Posted by d4guk2000
thanks mate i will check the elbow.why would the engine surge.thanks darren
Because the computer is trying to adapt to the fault condition caused by the extra air form the (presumed) leak.

Steve
 
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