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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
 

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
 

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

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