Category: Chevy Repair

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Check Engine Light Chevy Repair

How to Fix Chevy P0172 and P0175 Codes: Fuel System Running Rich

If you’re seeing the P0172 or P0175 code on your Chevy, it means your vehicle’s fuel system is running rich, which indicates that the engine is receiving too much fuel and not enough air. This can lead to poor fuel economy, increased emissions, and potential engine damage. Here’s a comprehensive guide on how to diagnose and fix these issues.

What Do P0172 and P0175 Codes Mean?

  • P0172: System Too Rich (Bank 1)
  • P0175: System Too Rich (Bank 2)

These codes indicate that the air-fuel mixture is too rich on either bank 1 or bank 2 of your engine.

Did this all with the scan tool I used, which you can get on Amazon here: https://amzn.to/3VDOM7w

Common Causes of P0172 and P0175 Codes

  1. Dirty or Faulty Mass Air Flow (MAF) Sensor: A dirty or faulty MAF sensor can send incorrect readings to the engine control unit (ECU), leading to a rich condition.
  2. Faulty Oxygen Sensors: Oxygen sensors that are not functioning properly can fail to provide accurate readings of the exhaust gases, causing the ECU to deliver too much fuel.
  3. Fuel Pressure Issues: High fuel pressure due to a faulty fuel pressure regulator or a clogged fuel return line can result in too much fuel being delivered to the engine.
  4. Leaking Fuel Injectors: Fuel injectors that are stuck open or leaking can cause an excessive amount of fuel to enter the combustion chamber.
  5. Faulty Engine Coolant Temperature Sensor: If this sensor gives incorrect readings, the ECU may think the engine is always cold, thus providing more fuel than necessary.
  6. Vacuum Leaks: Though less common for a rich condition, certain vacuum leaks can cause incorrect sensor readings, leading to a rich mixture.

Step-by-Step Guide to Fixing P0172 and P0175 Codes

  1. Check and Clean the MAF Sensor:
    • Disconnect the MAF sensor and inspect it for dirt and debris.
    • Use a MAF sensor cleaner to clean the sensor.
    • Reinstall the sensor and clear the codes to see if they return.
  2. Inspect and Replace Oxygen Sensors:
    • Use an OBD-II scanner to check the voltage readings of the oxygen sensors.
    • Replace any sensors that are not providing proper readings.
  3. Examine Fuel Pressure:
    • Use a fuel pressure gauge to check the pressure at the fuel rail.
    • If the pressure is too high, inspect the fuel pressure regulator and fuel return line for issues.
  4. Check Fuel Injectors:
    • Remove the fuel injectors and inspect them for leaks or blockages.
    • Clean or replace any faulty injectors.
  5. Test the Engine Coolant Temperature Sensor:
    • Use a multimeter to test the resistance of the sensor.
    • Replace the sensor if it is not within the manufacturer’s specifications.
  6. Inspect for Vacuum Leaks:
    • Use a smoke machine or carburetor cleaner to check for vacuum leaks.
    • Repair any leaks found.

Preventive Measures

  • Regular Maintenance: Regularly clean the MAF sensor and replace oxygen sensors as part of your vehicle’s maintenance schedule.
  • Use Quality Fuel: Using high-quality fuel can prevent build-up in the fuel system.
  • Monitor Engine Performance: Pay attention to changes in engine performance, fuel economy, and exhaust emissions.

Conclusion

Fixing P0172 and P0175 codes involves a systematic approach to identify and resolve the root cause of the rich condition. By following these steps, you can restore the correct air-fuel mixture in your Chevy, improving its performance and fuel efficiency. If the problem persists, it may be best to consult a professional mechanic.

For more detailed guidance, refer to reputable automotive resources and forums where experienced mechanics share their insights and troubleshooting tips.

By maintaining your vehicle properly and addressing issues promptly, you can avoid the negative effects of running a rich fuel mixture and keep your Chevy running smoothly.

References:

Use these sources for more detailed and specific guidance on fixing P0172 and P0175 codes in your Chevy.

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Automotive Repair Videos Check Engine Light Chevy Repair

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

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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Automotive Repair Videos Blog Check Engine Light Chevy Repair DIY Auto Repair

P1101 Air Flow Volume Chevy Malibu “Help Needed”

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.

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Automotive Repair Videos Blog Chevy Repair DIY Auto Repair

P0140 P0138 Code Chevy Truck

P0140 P0138 Code Chevy Truck
P0140 P0138 Code Chevy Truck

P0140 P0138 Code Chevy Truck, If you have a P0140 or a P0138 code in your chevy truck this video is for you. I will be showing you a few things you should check before replacing the oxygen sensor in your Chevy truck. Both these codes p0138 and p0140 are both for the bank 1 sensor 2 O2 sensor.


If you having trouble locating the right oxygen sensor I also have a video on that here: https://www.youtube.com/watch?v=tYUkcz64VU4

Mini code reader, I used in the video: https://amzn.to/34mOior

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Chevy Repair Diesel How To

6.6 Duramax Exhaust Fluid Quality Message Fix “Diagnostic Overview”

6.6 Duramax Exhaust Fluid Quality Message
6.6 Duramax Exhaust Fluid Quality Message

And this video we are working on a Duramax with a poor exhaust fluid quality message on the dash and the vehicle has gone into limp mode. This video is a diagnostic overview of what we did to fix the poor exhaust fluid quality message and get the vehicle out of limp mode.

We also had coolant temperature codes along with some glow plug codes. I will show you how to do a reductant fluid quality test along with a service Regen with the factory Tech 2 scan tool.

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Automotive Repair Videos Blog Chevy Repair DIY Auto Repair

How to remove a broken oil dipstick tube “Chevy 5.3l 6.0l”

How to remove a broken oil dipstick tube
How to remove a broken oil dipstick tube

How to remove a broken oil dipstick tube that is broken off inside of the block. And this video I have over several methods and tricks that may help in the process of getting a broken oil dipstick tube out of the engine block. I’m working on a Chevy pickup truck with a 5.3 L engine.

This method also applies for Chevy trucks with a 6.0 liter. First I had to remove the inner Fender to gain access to the oil dipstick tube. Once I had the inner Fender and tire removed I was able to get the torch in there and heat up the block to try and help the O-ring on oil dipstick tube to make it easier to remove.

Then I proceeded by using a self-tapping screw to screw into the old dipstick tube. Only the first half came out so I was unable to find another self-tapping screw to pull the second half of the dipstick out. I had to move it back and forth inside the engine block several times before I was able to remove it due to rust buildup. If for some reason the old part of the oil dipstick does fall down in the oil pan it should not cause any issues but definitely should be removed if possible.

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Automotive Repair Videos Check Engine Light Chevy Repair DIY Auto Repair

GMC Chevy P0332 P0327 Knock Sensor Circuit Low Input “TSB”

GMC Chevy P0332 P0327 Knock Sensor Circuit Low Input
GMC Chevy P0332 P0327 Knock Sensor Circuit Low Input

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Troubleshooting Knock Sensor Codes P0332 and P0327 on a Chevrolet Truck

If you’re working on a Chevrolet truck and you’ve encountered diagnostic trouble codes P0332 and P0327, there’s a good chance you’re dealing with a problem related to the knock sensors. These sensors are responsible for detecting engine knock or detonation and sending signals to the engine control module (ECM) so that the ignition timing can be adjusted accordingly. In this article, we’ll explain what can cause these codes to set, what the repair entails, and what the service bulletin is recommending to prevent future failures of the knock sensors.

What Causes Knock Sensor Codes P0332 and P0327 to Set?

There are several reasons why the knock sensors on a Chevrolet truck may fail, but the most common cause is a problem with the wiring or connections. Over time, the wires that connect the knock sensors to the ECM can become corroded or damaged, which can cause the resistance in the circuit to change. This can cause the ECM to receive incorrect signals from the sensors, resulting in the engine running poorly or setting diagnostic trouble codes.

Another common cause of knock sensor failure is a problem with the sensors themselves. The sensors can become damaged or worn out over time, which can cause them to lose their ability to detect engine knock. This can also result in the ECM receiving incorrect signals and setting diagnostic trouble codes.

What Does the Repair Entail?

The repair for knock sensor codes P0332 and P0327 will vary depending on the specific problem you’re dealing with. However, in most cases, the first step will be to disconnect the blue powertrain control module (PCM) connector and check the resistance value on the light blue wire at pin 11 for sensor two and the dark blue wire at pin 51. Both should be on the blue PCM connector, and the value should be between 93K and 107K ohms.

If the resistance is low, the next step will be to check the circuit for a shorted wire or a shorted sensor. This typically involves checking the wires for damage or corrosion and testing the sensors for continuity.

If the resistance is high, the next step will be to check for a corroded wire or a poor connection at the knock sensor. This will typically involve checking the wires for damage or corrosion and inspecting the connections for signs of wear or damage.

The next step is to use an AC voltmeter and check the Hz on each wire listed above while tapping on the engine block. You should be careful not to tap on any plastic engine components. While tapping on the block, the frequency on the meter should go over 125 hz.

Finally, if the problem is a faulty sensor or damaged wiring, the repair will typically involve replacing the knock sensors and/or repairing the damaged wiring.

What Does the Service Bulletin Recommend to Prevent Future Failures?

The service bulletin for knock sensor codes P0332 and P0327 recommends that technicians use a specifically designed harness with the knock sensors. This harness is designed to provide a secure and reliable connection between the sensors and the ECM, which can help to prevent problems with resistance and continuity.

In addition to using the correct harness, the service bulletin recommends that technicians use dielectric grease on the connectors to help prevent corrosion and damage. This grease can help to protect the connectors from the elements and prevent damage from moisture, dust, and other contaminants.

Average Reported Mileage: 338036
Tests/Procedures: 1. Disconnect the Blue Powertrain Control Module (PCM) connector and check the resistance value on the Light Blue wire at pin 11 for sensor two and the Dark Blue wire at pin 51. Both of these should be on the Blue PCM connector. The value should be 93K to 107K ohms.

2. If resistance is low, check the circuit for shorted wire or shorted sensor.

3. If resistance is high, check for corroded wire or poor connection at the knock sensor.

4. Use an AC voltmeter and check the Hz on each wire listed above while tapping on the engine block.

5. While tapping on the block, the frequency on the meter should go over 125 hz.

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