p0174

Chevy / GM P0171 or P0174 System To Lean Bank 1 Bank 2

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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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P0171 and P0174 System Running Lean Bank 1 and Bank 2 “Checking Fuel Trims”

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How to fix P0171 and P0174 System Running Lean Bank 1 and Bank 2 If you’re experiencing P0171 and P0174 system running lean, check for “fuel trims” in your bank 1 and bank 2. This video will show you how to diagnose and fix the issue using a simple scan tool. In this video, we’ll show you how to diagnose and fix the issue using a simple scan tool.

If you’re experiencing P0171 and P0174 system running lean, make sure to check for “fuel trims” in your bank 1 and bank 2. This will help to fix the issue and get your engine running smoothly again! if your car is setting lean obd code at idle it is most likely a vacuum leak. if it is running lean off idle you will need to look at other things like the mass air flow sensor for your problem

How to Confirm Your Repair P0171 P0174 System Lean

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How to Confirm Your Repair P0171 P0174 System Lean

In this video, I will be going over how to confirm you’re repair after diagnosing a p0171 or a p0174 system lean bank 1 and system Lean Bank 2. And this video will be repairing a vacuum leak and monitoring fuel trim values to verify that the repair was successful using fuel trim values on a scan tool. Just a brief overview of fuel trim used to verify a repair.

How to use fuel trim to make sure you car is fixed after the repair!

You fuel trim numbers should always stay around 0% and if they are adding fuel that would mean your engine is running lean. If your fuel trim is taking away the fuel that means your engine is running rich. #systemlean #p0171 #p0174

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P0171 p0174 System Lean bank 1 bank 2 Trailblazer “Fixed with no parts”

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p0171 fixed with no parts

Customer Concern: Malfunction Indicator Lamp (MIL) on. Powertrain Control Module (PCM) DTC P0171.
Average Reported Mileage: 100343
P0171 p0174 System Lean Trailblazer “Fixed with no parts”

Mass air flow sensor cleaner: https://amzn.to/2HbyNJm
Air filter and tune up kit for Chevy Trailblazer: https://amzn.to/2vt1pbA

Tests/Procedures: 1. Check for a vacuum leak by spraying water around the engine and see if it reacts.

2. At the Mass Air Flow (MAF) sensor connector locate, backprobe and ground the Yellow wire. Reset fuel trims using the scanner and see if Long Term Fuel Trim (LTFT) stay in single digits.

3. Access the fuel system test port, near the fuel tank and fuel filter.

4. Connect a pressure gauge to the port.

5. Fuel pressure should be steady at all loads, 50-57 PSI.

6. Verify that the fuel pressure value is between the range of 50-57 and not dropping under load.

7. Check fuel filter for restriction.

8. Clean the throttle body assembly.

9. Run cleaner through the injectors.

Vehicle Application:
2006 Rainier 4.2
2006 Trailblazer 4.2
2006 Trailblazer EXT 4.2
2006 Envoy 4.2
2006 Envoy XL 4.2
2006 Ascender 4.2
2006 9-7x 4.2

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P0171 P0172 P2187 Mercedes PCV Valve Replacement ” Running Lean”

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Mercedes-Benz CL63 AMG PVC

Diagnose check engine light. Stored code p2187, p0171, P0174 for system running lean. Smoked intake for vacuum leaks and none found. Found engine vacuum in crankcase due to failed positive crankcase ventilation valve. Crankcase ventilation valve will need to be replaced.

PCV Valve: https://amzn.to/2IznkiY
Crank Case Breather: https://amzn.to/2IznkiY

Engine light is on with fuel trim fault codes and there is an engine knocking noise at times.
Average Reported Mileage: 69772
Tests Procedures: 1. Check for excess crankcase vacuum. Remove the dipstick and connect a vacuum gauge.

2. If vacuum is found, then the pressure regulator valve for the crankcase has failed. See related documents for a picture of the location. Read bulletin LI01.20-P-046639.

3. If no issues are found, then inspect purge valve for being stuck open per bulletin LI47.30-P-049162.

4. Also check for leaking intake per bulletin T-B-09.20/27b.

5. Read bulletin LI09.20-P-061233 and the attached photos for locations of leaks.

6. Verify all recalls and campaigns have been performed.

7. Inspect for incorrect or blocked air filters.
Tech Tips: The pressure regulator valve prevents a vacuum -50 mbar from building up in the crankcase due to the intake manifold vacuum when the gases are extracted from the crankcase. When the crankcase pressure regulator fails, engine oil can get sucked into the combustion chamber.