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Relative Compression Test - Cranking Amperage 2012 Jeep SRT8 6.4L

Scott Owner/Technician Claremont, California Posted   Latest   Edited  
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Driveability
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2012 Jeep Grand Cherokee SRT8 6.4L 5-spd (W5A580 545RFE)—1C4RJFDJ8CC173844
Cranking Compression Test - Relative Amperage
Known Good
Picoscope

Cranking relative compression test 2018 Jeep SRT8 6.4

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Mark Mobile Technician
Arlington, Vermont
Mark Default
 

Do you see the little sideways Ms. on the way up on the compression stroke? Could that be valve overlap? Like you see with a FLS in the tailpipe cranking

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Scott Owner/Technician
Claremont, California
Scott Default
 

Hi Mark, I hadn't given this waveform much thought, however, I think you’re on to something here.

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