Uploaded April 2026 | Updated September 2026, 3 weeks ago
The test results were pointing in two different directions.
The compression waveform said the engine timing was off.
The cam/crank correlation said everything looked normal.
That contradiction led to one bold conclusion: a shifted crank keyway.
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#scannerdanner #automotivediagnostics #engineperformance #camcrank #autorepair #automotivetraining
The test results were pointing in two different directions.
The compression waveform said the engine timing was off.
The cam/crank correlation said everything looked normal.
That contradiction led to one bold conclusion: a shifted crank keyway.
Full training like this is on SD Premium:
scannerdanner.com/join-scannerdanner-premium.html
#scannerdanner #automotivediagnostics #engineperformance #camcrank #autorepair #automotivetraining
![Why Wont This Jeep Start?? [Part 2]](https://i.ytimg.com/vi/Hjgs_8wX6Ks/mqdefault.jpg "Why Wont This Jeep Start?? [Part 2]
Here is the link to part 1 https://youtu.be/glYGv3CyVWU
Im sorry guys, I wasnt going to release this one until we had a true answer, but the customer is not returning emails or phone calls. From what I was told, it was taken to a dealer and the Jeep was confirmed to be running and back on the road. My friend Pete has tried to reach out to her multiple times, and I even emailed her personally, explaining the situation and she never got back to me either. I do not think she is angry with us as she wasnt even charged, so Im not sure why she wont communicate with us.
From your comments in part 1, here are two things that I would have tried:
1. leaving the battery disconnected and terminals jumped together overnight
2. disable the fuel pump, relieve system rest pressure through my fuel pressure gauge, clear the 3 flooded cylinders I can get to (again), then crank the engine over with no fuel pressure and bring fuel pressure back immediately if it fires up from residual fuel in the system
3. fool the ECM with engine temperature (alter the ECT signal) to where it thinks the engine is hot, to eliminate the cold start enrichment
The key with getting this to relearn, is to get the engine running. Alcohol % is calculated based off of the oxygen sensors and fuel trim after the PCM sees an increase in fuel level.
Im also not sure that the process I chose, with removing fuel, only to put that same fuel back in, was a good move as there was never any start-up period in between, which may have been needed.
Frustrated and disappointed would be how I feel about this one. If I ever get an update from this customer, I will post and pin the comment here.
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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.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/join-scannerdanner-premium.html There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
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.")
![Quick message about my video editor [Caleb Danner]](https://i.ytimg.com/vi/JAnbqU7Em9E/mqdefault.jpg "Quick message about my video editor [Caleb Danner]
Just a quick video about my son Caleb and how proud I am of him! For those following our videos, he is the one that makes them so watchable even for those who have no idea what we are doing! Of course his humor comes into play at times too (like me riding a horse in our last video lol)
Love you my son. I couldnt do this without you.")
