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Pressure/Vacuum analysis
Posted to Technical Theory Forum on 5/6/2015 18 Replies

This vehicle is already diagnosed but I thought the resident transducer experts might like to take a crack at diagnosing this from my waveform captures.

The complaint is "engine runs very rough" NO Codes are stored. I decide to start with a relative compression test relative compression Ok, cylinder 2 definitely has low compression.

I'll post a couple snapshots of compression data and the scope files. Let me know if you can figure out the problem from the data.

3.7 Cranking 3.7 Running 2002 Jeep Liberty Limited 2002 Jeep Liberty Limited

Robert from Massachusetts

Files Referenced:

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car Vehicle Data

2002 Jeep Liberty Limited 3.7L

Engine3.7 L
Trans4-speed Automatic (Electronic)