Chevy / GM P0171 or P0174 System To Lean Bank 1 Bank 2
Автокөліктер мен көлік құралдары
I'm going to go over some common issues causing the P0171 and P0174 error codes in Chevy and GM vehicles, indicating a system too lean in both Bank 1 and Bank 2. Under standing fuel trim numbers can aid greatly in get to the source of the problem.
We start by conducting a smoke test on the intake to detect any leaks. Next, we assess the condition and performance of the mass air flow sensor and fuel pressure test to ensure they meet specifications. Further inspections include the PCV valve and the brake booster, along with other critical components like fuel pressure regulator, that could lead to a lean-running engine.
Whether you're a DIY enthusiast looking to understand more about your vehicle or a professional mechanic honing your skills, this video provides step-by-step guidance on diagnosing and fixing lean engine problems and understanding fuel trim reading on a scanner.
#ChevyRepair #LeanBank1Bank2 #AutoRepair #CarMaintenance #DIYMechanic #P0171 #P0174 #FlatRateMechanic
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Due to factors beyond the control of The Flat Rate Mechanic, it cannot guarantee against unauthorized modifications of this information or improper use of this information. The Flat Rate Mechanic assumes no liability for property damage or injury incurred as a result of any of the information contained in this automotive repair video. The Flat Rate Mechanic recommends safe practices when working on cars or trucks with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this repair video. Due to factors beyond the control of The Flat Rate Mechanic, no information contained in this automotive repair video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or the information contained.
Пікірлер: 9
This is the smoke leak checker I got on Amazon amzn.to/4ccprqC. It works great!
this was very helpful thank you! i bought the smoke tester, it's great. found a tiny leak where the intake boot clamps to the throttle, but no change after that was tightened. did a water spray all over the intake manifold gaskets and no steam out of the exhaust. smoke tested the exhaust as well and nothing. my long term fuel trim is around 18% on both banks at low load or idle and drops to around 10% under medium throttle. i did notice my intake air temp was considerably off from actual air temperatures and very slow to respond to changes ( from sitting in a parking lot, hot start on a hot day, to diving down the highway at 55, it changed very slowly and never read the right temp, was always high by about 5-10%) new maf on the way, i think mine is original, 20yrs old, 264k on it. cleaning it didn't have any impact.
Excellent
Thanks for posting the video. 2004 Yukon 5.3L threw a MAF sensor code, so I replaced with a Delphi MAF just this past week. Code cleared, and now I have 171 and 174. If I understand your comments, with more driving is it possible the fuel trim numbers settle out to be in spec and stops throwing those codes?
@tasaiyaxaypanya3140
Ай бұрын
I got a 5.3 Silverado and just replaced Maf and getting the same code, did u figure it out?
@CHRISFREE84
16 күн бұрын
@@tasaiyaxaypanya3140Same thing did you find a fix
You should have pulled up the data pid for the mass airflow sensor and see what the grams per second flow reading was, that might have told you something. Was that new sensor after market or dealer? great vid other wise.
@FlatRateMechanic
2 ай бұрын
We put a denso MAF - I've had pretty good luck with this brand. Wouldnt recommend after-market
I replaced the Maf sensor, the intake gasket, replaced a PCV valve and the tubing and there’s not any other leak, now I have a P0174 code. Should I have to replace the oxygen sensors? Help!!! I already spent $700 pus the parts.