This summary of the video was created by an AI. It might contain some inaccuracies.
00:00:00 – 00:12:41
The video discusses troubleshooting a recurrent check engine light issue in a 2017 Chevy Trax related to the P1101 code for intake airflow system performance. The mechanic identifies various components, such as the mass airflow sensor and PCV hose, as potential sources of the problem. Issues with throttle position readings and fuel trims point to unmetered air entering the engine. Conducting a smoke test reveals a significant vacuum leak in the intake system. Replacing a split hose going from the intercooler to the throttle body resolves the boost pressure loss, leading to improved fuel trim numbers and smoother acceleration. Finally, after aligning mass airflow sensor data, the issue is declared fixed, with no pending codes detected.
00:00:00
In this segment of the video, the mechanic discusses a 2017 Chevy Trax with a recurring check engine light issue despite multiple mass airflow sensor replacements. The diagnostic trouble code is P1101 for intake airflow system performance discrepancy. Various components under the hood, including the mass airflow sensor, PCV hose, purge valve, and airbox, have been tampered with or improperly installed. Additionally, a coolant leak from the thermostat housing is noted as a common issue. The mechanic plans to address these issues to resolve the P1101 code problem.
00:03:00
In this segment of the video, the speaker discusses the PCV valve located in the valve cover of the engine and how it can cause issues when broken. They explain that the PCV valve’s function is to regulate air entering the engine and its correlation with sensors like the mass airflow sensor and MAP sensor. The speaker notes abnormalities in throttle position readings and fuel trims, indicating potential unmetered air entering the engine. During a test drive, the speaker experiences lack of power and negative fuel trim values under heavy throttle, suggesting an issue with air intake. Finally, they observe that the fuel trim numbers return to normal when idling but express concern over the low throttle position readings.
00:06:00
In this segment of the video, the speaker discusses the issue of the long-term fuel trim number going negative when accelerating, indicating a potential problem with fuel-air mix. They suspect a vacuum leak may be causing insufficient air to reach the engine, leading to an imbalance in air and fuel ratios. The speaker then proceeds to conduct a smoke test to find potential vacuum leaks by introducing smoke into the intake system. They demonstrate how to properly set up the smoke test and identify locations prone to leaks, such as the line going to the brake booster. The smoke test reveals a significant amount of smoke, suggesting a notable leak that requires further investigation.
00:09:00
In this segment of the video, the main point is identifying a huge split in the hose going from the intercooler to the throttle body, causing a loss of boost pressure and affecting fuel trim numbers. The presenter replaces the charge air hose, showing the removal process, and successfully completes the repair. After driving the vehicle, they observe improved fuel trim numbers and reduced hesitation during acceleration. Additionally, the car no longer triggers error codes after a 6-mile drive, with the throttle position stabilizing around 8%.
00:12:00
In this part of the video, the narrator discusses how the mass airflow sensor and the calculated air flow numbers have aligned, indicating a positive sign. They check for any pending codes and find none, declaring the issue fixed. The narrator plans to inform the customer about a coolant leak that was detected but states it is not severe. The video concludes with gratitude to viewers for watching.