Uploaded March 2026 | Updated September 2026, 3 weeks ago
This class is a great lesson in in-cylinder pressure analysis and why pressure transducer testing can take you to the right answer when other tests point you in the wrong direction.
In this case, the vehicle felt like it had a plugged exhaust. Even the symptoms and some of the early test results pushed us that way. But the in-cylinder pressure waveform told a different story. By looking at exhaust-stroke pressure, intake vacuum, running compression, and valve event timing, we were able to prove this was not a restricted exhaust and move toward the real problem.
Watch Part 1 here:
youtu.be/8q1OaCYe8bY
This is also a strong reminder that cam/crank correlation alone does not always tell the full story. The known-good comparison was spot on, yet the in-cylinder waveform showed clear evidence of a timing-related issue.
If you want to get better at reading pressure transducer waveforms, measuring valve events, and using running compression as a diagnostic tool, this class is packed with value.
🔧 Looking for deeper training?
Join ScannerDanner Premium for full courses, case studies, and foundational diagnostics training:
scannerdanner.com/join-scannerdanner-premium.html
On ScannerDanner Premium, you’ll get:
• In-depth classroom lectures straight from my book
• Real case studies with known-good and failed test results
• Training focused on process, not guesswork
• Electrical, electronics, and drivability diagnostics
• Access to hundreds of hours of premium content
📘 Want to learn more about diagnostics?
Check out my book, Engine Performance Diagnostics, plus tool links here:
https://linktr.ee/scannerdanner
00:00 In-cylinder pressure proves it’s not a restricted exhaust
04:09 Running vs. cranking compression reveals a major breathing problem
07:52 Exhaust valve opening and intake valve closing both point to late cam timing
13:11 Spark timing checks show the whole event is shifted
18:47 Cam/crank correlation still looks normal because of a shifted crank keyway theory
23:26 Recall research and crank gear design support the damaged-keyway conclusion
29:43 Hard brake pedal was caused by low engine vacuum, not a bad brake booster
32:52 Final teardown begins to confirm the diagnosis
#ScannerDanner #InCylinderPressure #PressureTransducer #RunningCompression #EngineTiming #AutomotiveDiagnostics #OscilloscopeDiagnostics #DrivabilityDiagnosis
⚠️ Disclaimer:
ScannerDanner LLC is not responsible for misuse, unauthorized changes, or incorrect application of any information provided in this video. Always follow proper safety procedures and manufacturer information when performing vehicle testing and repairs. Use this content at your own risk.
This class is a great lesson in in-cylinder pressure analysis and why pressure transducer testing can take you to the right answer when other tests point you in the wrong direction.
In this case, the vehicle felt like it had a plugged exhaust. Even the symptoms and some of the early test results pushed us that way. But the in-cylinder pressure waveform told a different story. By looking at exhaust-stroke pressure, intake vacuum, running compression, and valve event timing, we were able to prove this was not a restricted exhaust and move toward the real problem.
Watch Part 1 here:
youtu.be/8q1OaCYe8bY
This is also a strong reminder that cam/crank correlation alone does not always tell the full story. The known-good comparison was spot on, yet the in-cylinder waveform showed clear evidence of a timing-related issue.
If you want to get better at reading pressure transducer waveforms, measuring valve events, and using running compression as a diagnostic tool, this class is packed with value.
🔧 Looking for deeper training?
Join ScannerDanner Premium for full courses, case studies, and foundational diagnostics training:
scannerdanner.com/join-scannerdanner-premium.html
On ScannerDanner Premium, you’ll get:
• In-depth classroom lectures straight from my book
• Real case studies with known-good and failed test results
• Training focused on process, not guesswork
• Electrical, electronics, and drivability diagnostics
• Access to hundreds of hours of premium content
📘 Want to learn more about diagnostics?
Check out my book, Engine Performance Diagnostics, plus tool links here:
https://linktr.ee/scannerdanner
00:00 In-cylinder pressure proves it’s not a restricted exhaust
04:09 Running vs. cranking compression reveals a major breathing problem
07:52 Exhaust valve opening and intake valve closing both point to late cam timing
13:11 Spark timing checks show the whole event is shifted
18:47 Cam/crank correlation still looks normal because of a shifted crank keyway theory
23:26 Recall research and crank gear design support the damaged-keyway conclusion
29:43 Hard brake pedal was caused by low engine vacuum, not a bad brake booster
32:52 Final teardown begins to confirm the diagnosis
#ScannerDanner #InCylinderPressure #PressureTransducer #RunningCompression #EngineTiming #AutomotiveDiagnostics #OscilloscopeDiagnostics #DrivabilityDiagnosis
⚠️ Disclaimer:
ScannerDanner LLC is not responsible for misuse, unauthorized changes, or incorrect application of any information provided in this video. Always follow proper safety procedures and manufacturer information when performing vehicle testing and repairs. Use this content at your own risk.
![Ignition System Testing - Primary Current [Audi A6 part 1 of 2]](https://i.ytimg.com/vi/qRvWefjb0F4/mqdefault.jpg "Ignition System Testing - Primary Current [Audi A6 part 1 of 2]
Ignition System Testing - Primary Current [Audi A6 part 1 of 2]")
![Low Voltage from a Bad Ground? [Voltage Drop Testing Fundamentals]](https://i.ytimg.com/vi/rGQ-bA9z39Y/mqdefault.jpg "Low Voltage from a Bad Ground? [Voltage Drop Testing Fundamentals]
Low Voltage from a Bad Ground? [Voltage Drop Testing Fundamentals]")
![A/C Compressor Clutch Circuit Testing [All Cars] + Recharge](https://i.ytimg.com/vi/sBueOct0qXY/mqdefault.jpg "A/C Compressor Clutch Circuit Testing [All Cars] + Recharge
2013 Ford F-150 5.0L A/C System Clutch Circuit Testing, Electrical Repair and Recharge (topping off a slightly low system using gauge pressures as a guide)
00:00 - intro
00:16 - system pressure test
00:55 - full code scan of all modules
01:12 - Engine Computer Air Conditioning Request Input Test
02:10 - bi-directional test with scan tool
03:07 - A/C clutch tap test
03:54 - testing of the circuit at the A/C relay begins
05:11 - need highlight changed
05:55 - testing the ECM driver
06:32 - continuity test for the clutch (open found)
10:25 - tightening terminals at A/C connector
12:22 - A/C pressures after wiring repair (low charge)
14:51 - topping off the A/C system using gauge pressures to determine charge
18:32 - proper way to remove A/C gauges
📘 Want to Learn More About Diagnostics?
Check out my field manual, Engine Performance Diagnostics, available as both an eBook and paperback at:
👉 https://linktr.ee/scannerdanner
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https://www.scannerdanner.com/join-scannerdanner-premium.html
On ScannerDanner Premium, youll get:
*In-depth classroom lectures straight from my book
*Exclusive case studies with live vehicles pulled into class
*Real-time troubleshooting using proven methods
*Post help requests on our forum
*Fundamental training on diagnosing automotive electrical and electronics systems.
ScannerDanner Tools:
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⚠️ Disclaimer:
ScannerDanner LLC is not responsible for misuse, unauthorized changes, or incorrect application of any information provided. Always follow proper safety protocols when using tools, equipment, or procedures discussed in this video. Use this content at your own risk.")
