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relicdigger3, ASE Certified Technician
Category: Chevy
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Experience:  ASE Certified Master Technician, GM Certified Technician
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2001 chevy suburban: p0171..p0174..Injector problem? ERG problem

Customer Question

2001 chevy suburban, P0171 and P0174. Injector problem? ERG problem?
Fuel Sys 1...............CL
Fuel Sys 2...............CL
Calc Load (%)..........22.4
ECT in celsius...........57
STFT B1 ................-3.9
LTFT B1.................22.7
STFT B2.................-1.6
LTFT B2.................22.7
Eng RPM.................1858
Veh Speed (km/h).....20
MAF (g/s)................45.68
Submitted: 3 years ago.
Category: Chevy
Expert:  relicdigger3 replied 3 years ago.
Codes P0171 and P0174 are lean codes which means the fuel system is running lean. In other words, the engine is taking in more air than fuel and it's throwing off the air/ fuel ratio. This can be caused by a variety of things such as a vacuum leak. A vacuum leak can be caused by a leaking hose or a leaking intake gasket. A lean condition can also be caused by low fuel pressure, a faulty oxygen sensor and other things. You should start by looking for vacuum leaks. Vacuum leaks can sometimes be heard because they produce a whistling sound from the engine compartment.

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