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P0171 / P0174 codes

cashflow50

By cashflow50
June 14, 2020 in Ask A GM Technician

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cashflow50

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cashflow50

Posted June 14, 2020

Posted June 14, 2020

2003 GMC Yukon 4.8L

Don’t have those scanners that gives you extra data, just got a simple one that gives you the codes only. Well I’ve researched that it’s mainly a vacuum leak issue. I’ve checked all vacuum hoses and even used a smoker and can’t seem to find where the problem is. Is there a common area where this leak occurs? Man it’s like finding a needle in a haystack. Need help from the gm gurus. Thanks

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Enthusiast

carkhz316

Posted June 14, 2020

Posted June 14, 2020

A dirty MAF can erroneously cause those codes. It's an easy check given that you haven't found an apparent vacuum leak via your tests.

Senior Enthusiast

Doug_Scott

Posted June 15, 2020

Posted June 15, 2020

Did you check the intake manifold where it meets the cylinder head?

cashflow50

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cashflow50

Posted June 15, 2020

Author

Posted June 15, 2020

Not yet but I plan to spray with water and soap there

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