A 2012 Chevy Cruze presented with engine noise, lack of power, and a check engine light. Initial code readings revealed P00B7 (low coolant) and several other codes. While P00B7 is often caused by low coolant, further diagnostics were necessary to pinpoint the source of the ticking engine noise. This article highlights the importance of using the Best 2013 Cruze Scan Tool for accurate diagnosis.
Utilizing a scan tool with live data capabilities revealed unusual knock sensor readings, including cylinder-specific knock data. The data pointed towards cylinder #1 as the potential problem area.
A power balance test was conducted to confirm the findings, but all cylinders were contributing equally, and the noise persisted. A stethoscope was then used to pinpoint the noise, which seemed to originate from the valve cover above cylinder #4, contradicting the initial scan tool data.
Upon removing the valve cover, it was discovered that both intake lifters for cylinder #4 and one intake lifter for cylinder #2 were not pumped up, explaining the ticking noise. Further inspection revealed a loose timing chain upper guide with loose bolts.
This loose guide caused an oil pressure leak in the upper end, affecting the lifters. The oil passage beneath the guide lubricates the timing chain.
Tightening the bolts resolved the noise and cleared the codes. While the cylinder-specific knock data provided by the scan tool was insightful, it ultimately proved inaccurate in this case. This underscores the need for a comprehensive diagnostic approach, combining scan tool data with traditional mechanical inspection methods. A high-quality scan tool for a 2013 Cruze should provide accurate live data, allowing technicians to quickly identify potential issues and avoid unnecessary part replacements. This case study highlights how a seemingly complex issue can be resolved with the right tools and diagnostic procedures, preventing misdiagnosis and saving valuable time and money.
