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Discussion Boards > Active Subjects > Messages as Posted > Chevy Pickup Trucks Forum

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01-23-2008, 09:51

Post: 150605

Chief

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Chevy Truck bad mileage Engine Code P171

BA,

Have you tried replacing the oxygen sensor(s)? The fact that you get a lean condition code latched points toward something in this part of the system.

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01-23-2008, 09:54

Post: 150606

Chief

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Chevy Truck bad mileage Engine Code P171

Another item you might try after you identify the current problem is to install a set of underdrive pulleys on the engine for the crank and alternator. They free up a little hp that might save you 1 mpg give or take.

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02-04-2008, 11:15

Post: 151083

Chief

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Chevy Truck bad mileage Engine Code P171

The weather here has been nice n wet, which is just what we badly need. With these engines, it can be difficult to diagnose what is causing the problem without hooking the engine up to an analyzer. The more I think about it, the oxygen sensors could be reading correctly. Another possible culprit could be a temperature sensor for the incoming air. On Cummins diesel it is called an IAT sensor but it can noticably effect fuel consumption as the more warm the air the less dense the oxygen in a given volume of air thus telling the computer to lean the mixture out or in your case with cold temps the more dense the oxygen in a given volume of air calling for more fuel until the engine has fully warmed up.

Another culprit could be the fuel you are burning. Depending upon the percentage of ethanol in the fuel, your fuel economy can take a nose dive. For example, fuel economy can drop by a third or more with E-85.

Just a few more ideas to consider.

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BA, Have you tried replacing the oxygen sensor(s)? The fact that you get a lean condition code latched points toward something in this part of the system.

Another item you might try after you identify the current problem is to install a set of underdrive pulleys on the engine for the crank and alternator. They free up a little hp that might save you 1 mpg give or take.

BA,

Have you tried replacing the oxygen sensor(s)? The fact that you get a lean condition code latched points toward something in this part of the system.