Part 1 https://youtu.be/mxPdxGqRWvc
This vehicle came in with good spark and no injector pulse. In part 1 of this case study I discuss with my class what this particular computer system needs to provide injector pulse.
Symptoms
- intermittent no start with good spark and no injector pulse
- hesitation
- misfire
Fix
- replace shorted fuel injectors
Tests shown
- how to test for a reference pulse
- how to verify the
ECM is receiving an
RPM signal
- how to speed up scan data parameters
- how to test for injector pulse
- how to enter a clear flood mode
- injector voltage waveforms
- injector current waveforms
Tools used
- scan tool
- lab scope
- low amp probe
- back-probing tools
- test leads
Playlist
- (
Chapters 17, 18 and 19)
Fuel Injector Testing
https://www.youtube.com/playlist?list=PLAFYVCyenqcoYm94zK0-EP0ICsGWj_ICs
Related Videos
- GM
Bypass Ignition System Operation (part 1)
https://youtu.be/mxPdxGqRWvc
- How to test for shorted fuel injectors (1987-1994 GM
Cars)
https://youtu.be/ssxuR5At6Io
- No
Start No injector pulse (shorted injector) part 1
https://youtu.be/KF9viLxwJNc
- No Start No injector pulse (shorted injector) part 2
https://youtu.be/3gTLY6vsxMg
-
Rough idle, false
MAP codes intermittent no start (shorted injectors) GM https://youtu.be/iIO-2LmwkdY
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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- published: 18 Nov 2011
- views: 22953