Jumped timing chain (no compression on 3 cylinders) - GM 3.6

Anyone looking for information on checking engine timing with a scope, look no further! I have the opportunity to show several different methods of testing on this Buick with a chain problem, and how you can be confident in your call. We also get to see another variable with the relative compression test, which can bite you if you’re not careful.
Engine Performance Diagnostics chapter 1
Symptoms
crank no start
spark and fuel present
no excessive exhaust backpressure
Fix
corrected the jumped timing chain
Tests shown
how to listen for compression during cranking
how to use an incandescent test light to check for spark
performing a relative compression test with an ignition sync
analyzing relative compression waveforms for timing issues
using a lab scope to check cam/crank relationship
using an in-cylinder pressure transducer
how to perform a cranking vacuum test by covering the throttle body
analyzing cam/crank waveforms in detail
Tools used
PicoScope 4425 4 Channel Standard Diagnostic Kit
www.aeswave.com...
WPS500X Pressure Transducer Kit
www.aeswave.com...
Inductive High Amp Current Probe
www.aeswave.com...
Playlist
(Chapter 1) Misfire ID, Compression Tests, Vacuum Leaks, Fuel Trim, Head Gasket, Restricted Exhaust, Low Power, DMM
• (Chapter 1) Misfire ID...
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.