codes po171 po174

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Oct 23, 2007 | 03:06 PM

d4guk2000

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Joined: Jan 2007

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From: uk

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.

Oct 23, 2007 | 05:31 PM

projectSHO89

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Joined: Oct 2002

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From: St. Louis (Out in the woods)

Click on the SEARCH button and enter "P0171 P0174" as your SEARCH keywords.

One of the most common issues areound here...

Steve

Oct 23, 2007 | 06:24 PM

torkum

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From: Lebanon,TN

You have a vacuum leak, read about the PCV elbow.

Oct 24, 2007 | 03:01 PM

d4guk2000

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From: uk

Quote:

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

Oct 25, 2007 | 07:43 AM

projectSHO89

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Posts: 7,295

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From: St. Louis (Out in the woods)

Quote:

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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