P0171 & P0174

[georgiabuck]

New to the site, thanks for having me. I wanted to check with any of you to see if this is something others have ran into? (P0171-P0174) Advanced check my codes and this is what i got back. Here lately, the truck has idled very rough first thing in the morning almost like it's going to stall out. CE light is on. Any help would be great. Thanks in advance.

[GM-Tech]

Those codes indicate the engine is running lean. Could be vacuum leaks, fuel pressure (unlikely), O2 sensor(s), etc.

 

I'd look first for vacuum leaks. Perhaps the intake.

[georgiabuck]

Thanks my man. Hope this or anything else that is posted can help others. Any great way vacuum lines can be checked? Thanks.

[Mr. Smith]

Thanks my man. Hope this or anything else that is posted can help others. Any great way vacuum lines can be checked? Thanks.

 

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Intake gasket, put a vac gauge off the fuel press regulator line

[GM-Tech]

Thanks my man. Hope this or anything else that is posted can help others. Any great way vacuum lines can be checked? Thanks.

 

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There aren't many vacuum lines. The PCV hose and the booster hose, if it's the vacuum type, are the only ones I can think of. Never seen those leak, but of course anything is possible.

 

I'm thinking more along the lines of the intake. Use a carb cleaner spray around the mating surface of the intake and see if you get a significant response to the spray.