Conventional wisdom tells us to check for spark, fuel and compression during no start diagnostics. Where do you go when you have all three? This video explores multiple ways to test for ignition and valve timing issues, and how you can be confident in your call before spending labor time on tear down/inspection.

Engine Performance Diagnostics chapter 23

Symptoms
- starts, runs, stalls

Fix
- reset the timing belt

Tests shown
- how to add fuel to the intake to check for a fuel delivery issue
- how to check for spark with an incandescent test light
- how to check for an exhaust backpressure issue by removing the upstream O2 sensor
- how to check fuel pressure with a gauge
- how to check for fuel injection pulse with an incandescent test light
- how to check cylinder compression with a gauge
- using and understanding a coil-on-plug ignition sync for scope testing
- how to check ignition timing compared to an in-cylinder waveform
- checking cam/crank correlation with a lab scope
- using cam/crank relationship to check for a timing belt problem
- how to visually verify valve timing with cam/crank timing marks on a Honda 1.7L engine

Tools used
- carburetor cleaner
- incandescent test light https://www.jbtoolsales.com/otc-3633-...
- fuel pressure tester https://www.jbtoolsales.com/s-u-r-r-f...
- PicoScope 4425 4 Channel Standard Diagnostic Kit
https://www.aeswave.com/cart.php?m=af...
- Pico WPS500 pressure transducer https://www.aeswave.com/cart.php?m=af...

Playlist
- (Chapter 23) No Start Diagnostics with good spark and fuel
   • (Chapter 23) No Start Diagnostics wit...  

Related videos
- Jumped timing chain (no compression on 3 cylinders) - GM 3.6
   • Jumped timing chain (no compression o...  
- How to check for a jumped timing chain or belt
   • How to check for a jumped timing chai...  
- How to identify a broken timing chain - GM 2.2 (part 1)
   • How to identify a broken timing chain...  
- How to identify a broken timing chain - GM 2.2 (part 2)
   • How to identify a broken timing chain...  

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.