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.
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P0442 code, which signals a Small EVAP leak (Evaporative Emission Control System). Understanding the P0442 Code: let’s solve this small EVAP leak mystery!
The P0442 error code is an alert from your vehicle’s onboard diagnostics system indicating a small leak in the Evaporative Emission Control System.
This system is crucial for reducing the car’s emissions and preventing fuel vapors from escaping into the atmosphere. Detecting a small leak can be challenging, akin to finding a needle in a haystack, but with the right approach, it’s entirely feasible.
Tools You May Need Before we start our diagnostic, ensure you have the following tools at hand:
Visual Inspection: Conduct a thorough visual inspection of the EVAP system. Look for obvious signs of damage, such as cracked hoses or loose connections. Smoke Test: Utilize a smoke machine to introduce smoke into the EVAP system. The smoke will exit through the leak, revealing its location. This step is crucial for pinpointing the exact source of the leak.
If no leaks are found you may need to replace Defective Parts: Bad parts could range from a gas cap to more complex parts like the purge valve, vent valve, or the EVAP canister. In this case, we had a bad EVAP purge valve After the repair, clear the P0442 code from your vehicle’s computer system using an OBD-II scanner and if you check, the engine light says out for over 100 miles – congratulations, your problem is fixed
The P1101 code primarily indicates a problem with the Mass Airflow (MAF) sensor in Chevy Cruze and Malibu models. This sensor plays a crucial role in measuring the volume of air entering the engine, which is essential for maintaining the correct air-fuel ratio. A fault in the MAF sensor can lead to inefficiencies in engine performance, including reduced power output, decreased fuel efficiency, and potential stalling or starting issues.
Diagnostic and Repair Guide
PCV Valve and Mass Airflow System Inspection: Begin by inspecting the PCV valve for any signs of faultiness. A rattling sound from the valve upon shaking indicates it needs replacement. For the MAF sensor, use an OBD-II scanner to check for proper voltage readings. Abnormal readings suggest the sensor needs replacement.
Oxygen Sensor Check: A faulty oxygen sensor might contribute to the P1101 code by storing additional trouble codes. Replace any malfunctioning sensors to avoid exacerbating the issue.
Air Filter and Throttle Body: Inspect the air filter for any blockages that could restrict airflow to the engine. A dirty throttle body can also impede airflow, necessitating cleaning or replacement if it’s contributing to the P1101 code.
Vacuum Leak Identification: Vacuum leaks in the engine can disrupt the air-fuel mixture, leading to the P1101 code. Utilize a smoke machine to detect leaks in the intake manifold or any part of the air intake system. Smoke emanating from any component indicates a leak that must be repaired.
Inspecting the Intake Hose: Damage or leaks in the intake hose can lead to issues similar to those caused by vacuum leaks, as they can allow unmeasured air into the engine, disrupting the air-fuel balance.
Preventive Maintenance Tips
Regularly inspect and clean the MAF sensor and replace the air filter as needed to prevent blockages.
Inspect hoses and connections within the air intake system for signs of wear or damage and replace as necessary to prevent future vacuum leaks.
Now, let’s explore the steps you can take to resolve the P1101 code and get your Chevy Cruze or Malibu back on track:
Inspect MAF Sensor Connections: Begin by inspecting the connections to the MAF sensor. Ensure that the electrical connector is securely attached and that there are no visible signs of damage or corrosion.
Clean MAF Sensor: Over time, the MAF sensor can accumulate dirt, oil, or other contaminants, affecting its performance. Use a specialized MAF sensor cleaner to carefully clean the sensor. Be gentle to avoid damaging delicate components.
Check Air Filter: A clogged or dirty air filter can also cause issues with airflow, leading to MAF sensor problems. Inspect the air filter and replace it if necessary.
Inspect for Vacuum Leaks: Vacuum leaks can disrupt the airflow and lead to irregular MAF sensor readings. Perform a thorough inspection of the vacuum lines and connections, repairing any leaks you find.
Reset ECM: After completing the above steps, reset the ECM to clear the trouble code. You can do this by disconnecting the battery for a few minutes or using a diagnostic tool.
Monitor Performance: Once you’ve addressed the potential causes of the P1101 code, monitor your vehicle’s performance. If the check engine light remains off and the engine operates smoothly, you’ve likely resolved the issue.
Professional Assistance:
If you’re uncomfortable performing these steps yourself or if the issue persists after attempting the fixes, it’s advisable to seek assistance from a qualified mechanic or dealership. They have the expertise and diagnostic tools necessary to accurately diagnose and address the problem.
Conclusion:
Encountering the P1101 trouble code on your Chevy Cruze or Malibu can be concerning, but it’s not an insurmountable obstacle. By following the steps outlined above, you can effectively diagnose and resolve the issue, restoring your vehicle’s performance and efficiency. Remember, regular maintenance and prompt attention to warning signs are key to keeping your vehicle running smoothly for years to come.
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All right flat rate mechanic here again and we’re diagnosing a p1101 for airflow volume on this Chevy Malibu which seems to be a pretty common problem. The customer came in and they had already replaced the mass airflow sensor one of my techs diagnosed it and we ended up cleaning the throttle body and putting in a map sensor. The check engine light still came back on so I’m gonna kind to go through what I found and how to check these first. What you really need to do if you’re trying to fix p1101 for the airflow is you’re going to need to smoke the actual boost side of this intake system so basically you’re going to have to block off where the air comes in here and lock it off here and you’re going to want to check for leaks through this uh through the turbo through the intercooler and see if you got any leaks on that air charge side of this whole system there’s any leaks whatsoever it’s going to cause that p1101
we did smoke that we took it up here we actually smoked it through here blocked this off we didn’t find any leaks so that all checked out good and we’ve replaced both the booth sensor and the mass airflow sensor or the map sensor sorry the only sensor we haven’t done is a boost sensor but thus far that seems to check out our right but I’m going to show you what we found um I do have this little deal here wants us to check some some of the perimeters on the scan tool which I have up right now we got our boost pressure sensor fuel trim manifold pressure and mass airflow so um and on here one of the first things it wants you to do is uh we want you to basically compare your boost pressure sensor to your Maps sensor pressure so we can go ahead and do that and you’re going to want to do that with the engine off so we’ll go ahead and shut the engine off and we’ll go to English here so we’ve got pounds and you can see where uh relatively close to win range we got 13.5 and 14.1 so I would consider that acceptable so now we’ll go ahead and start it the next thing he wants us to do is check the mass airflow sensor we should have approximately three grams per second at idle so we’re going to go ahead and check that next we’re going to go ahead and start it up and we’ll change our scan tool to metric so we can read grams per second and looks like we’re at about 2.8 and now this is a new Point 2.4 actually so this is a new mass airflow sensor our idle uh seems like we are idling very low we did do a throttle body cleaning Subscribe to my youtube channel here: https://goo.gl/j1pCfn
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The Flat Rate Mechanic. 26-year ASE Master Automotive Technician and Advanced level ASE certified here to help you save money on your automotive repairs The Flat Rate Mechanic is a participant in the Amazon Influencer Program. Disclaimer: 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.
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
In this video, we are working on a 2004 VW TDI with a cylinder 1 misfire and it has a check engine light on with a stored code P0301 P0302 P0304 P0305. After diagnosing the car and removing the valve cover we found the cylinder 1 camshaft lobe was completely worn done and the camshaft follower was almost worn through.
Also after further inspection, we found that all the camshaft bearing was bad.
After replacing the camshaft, bearing, and cam followers the misfire was gone a VW was running well again.
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Check fuel cap light on in your car or truck? In this video, I go over what you should check first if you have code p0442, p0455, p0456 or a check gas cap light and or a check engine light. Do this easy check before spending any money on repairs.
Fuel Injector Testing Hack P0201 P0202 P0203 P0204 P0302 and this video will be diagnosing a cylinder to misfire where the fuel injector has failed. I’ll also be showing you a cool little hack where you can test for fuel injector signal without a noid light. As always you should you the proper test equipment. You can get noid light test kit on Amazon here: https://amzn.to/2UaVQWP
Also, I wanted to add which I should have mentioned in the video a lot of times when the computer sense has a problem in the fuel injector circuit shut off power to that fuel injector so prior to testing the fuel injector circuit I recommend clearing the computer codes then testing your fuel injector signal. On this vehicle, I found fuel injector bad. Check out The Flat Rate Mechanics Tool Store on Amazon https://goo.gl/M8MpdC Subscribe to my youtube channel here: https://goo.gl/j1pCfn
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
