The Autel MaxiCOM MK808 is a powerful diagnostic scanner popular among DIY mechanics and professional technicians alike. One crucial function it offers is the ability to perform a compression test. This guide will delve into how to use the MX808 for an “Autel MX808 check compression,” outlining its capabilities and providing answers to frequently asked questions about this essential diagnostic procedure.
While the MK808 doesn’t directly measure compression, it facilitates this process by allowing you to monitor critical engine data in real-time. By observing parameters like crankshaft position, RPM, and misfire data during a traditional compression test, the MK808 helps pinpoint the cylinders with low compression more effectively. This indirect approach using the “Autel MX808 check compression” method enhances the diagnostic process, making it easier to identify issues like worn piston rings, damaged valves, or head gasket problems.
Using the Autel MX808 to Aid Compression Testing
A conventional compression test requires a dedicated compression gauge. Here’s how the MK808 complements this procedure:
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Prepare the Vehicle: Ensure the engine is warm and disconnect the ignition system to prevent accidental starting. Remove all spark plugs.
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Connect the Compression Gauge: Install the compression gauge into the spark plug hole of the first cylinder.
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Crank the Engine: While a helper cranks the engine, observe live data on the MK808, specifically focusing on RPM, crankshaft position sensor readings, and any misfire data being recorded. A healthy cylinder will show a consistent increase in RPM and crankshaft sensor readings. Inconsistent readings might indicate a problem.
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Record and Analyze Data: Note the peak pressure reading on the compression gauge. Repeat steps 2 and 3 for each cylinder, recording the data for comparison. Simultaneously, analyze the data stream from the MK808 for each cylinder.
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Compare Results: Compare the compression gauge readings across all cylinders. Significant variations between cylinders indicate a potential problem. Cross-reference this with the MK808 data; cylinders with low compression may also exhibit unusual RPM fluctuations or trigger misfire codes during cranking.
(Image source: Example Compression Test Image)
FAQs About Autel MX808 and Compression Testing
Q: Does the Autel MK808 have a built-in compression tester?
A: No, the MK808 does not directly measure compression. It assists in the process by providing real-time engine data during a traditional compression test performed with a separate gauge.
Q: Why use the MK808 during a compression test?
A: The MK808 enhances compression testing by displaying live data, such as RPM, crankshaft position, and misfire counts. This helps pinpoint problematic cylinders more accurately than relying solely on a compression gauge.
Q: Can the Autel MK808 diagnose low compression?
A: While the MK808 doesn’t directly measure compression, by analyzing related engine data during the test, it can help identify cylinders with potential low compression issues, enabling a more precise diagnosis.
Q: What other tests can the Autel MK808 perform?
A: The MK808 offers a wide range of diagnostic functions beyond aiding compression testing, including reading and clearing codes, performing active tests, accessing service functions, and displaying live data for various vehicle systems.
Conclusion
The Autel MaxiCOM MK808, while not a direct compression tester, provides invaluable data that complements a traditional compression test. By using the “Autel MX808 check compression” method, mechanics can diagnose engine problems more effectively, saving time and ensuring accurate repairs. The MK808’s ability to monitor live engine data offers a comprehensive approach to diagnosing low compression, making it a valuable tool for any automotive professional or serious DIYer.
