2000 Mercury Villager-Nissan Quest Misfire - is it spark, fuel or compression

As with any misfire, you have to think about spark, fuel and compression. I will walk you through some quick tests on verifying all three, before narrowing in on a faulty fuel injector. The tests shown in this video are universal in nature and can be applied to any car.
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Video breakdown:
- :38 trouble codes P0302, P0325
- 1:25 cylinder drop test (RPM drop test) using a test light
- 3:10 how far of a gap should spark jump from a coil or wire?
- 4:45 initial cranking sound test to verify good compression
- 5:25 other relative compression (cranking compression) videos I've done:
https://www.youtube.com/watch?v=pOghpmVhVng
https://www.youtube.com/watch?v=WKdZsWU2ZmI
- 6:00 beginning of fuel injector tests
- 6:10 (video mention) How to test a fuel injector (open winding) Nissan https://www.youtube.com/watch?v=mmRhcVkJdeQ
- 8:31 video to help you understand what a "trigger" setting is used for on a scope https://www.youtube.com/watch?v=81AGbZcgCZs
- 10:00 good and bad injector voltage waveform
- 11:17 video to help you understand fuel injector patterns and what to look for "How to interpret fuel injector waveforms (a free ScannerDanner Premium video)"
https://www.youtube.com/watch?v=4mut0Lpg5k4
- 14:19 (video mention) Nissan Quest open injector (2nd mention)
https://www.youtube.com/watch?v=mmRhcVkJdeQ
- 16:45 (video mention) Stuck Open Fuel Injector (how to fix)
https://www.youtube.com/watch?v=NXrd1fYwj1o
- 18:47 uScope (single channel, inexpensive lab scope) https://goo.gl/1CHxQC
- 20:58 (video mention) Lexus fuel injector failing when hot, misfire (fixed with snow) https://www.youtube.com/watch?v=b8ww7lMMpZ8
- 21:51 uTest Advanced Terminal Kit https://goo.gl/fPVhJs
- 23:34 resistance of bad injector compared to known good
- 27:30 amperage measurements (low amp probe/scope)
- 30:46 cranking compression sound test (good and bad)

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.
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