A common problem on these second generation GM fuel injectors. (Multec 2) They would mechanically stick closed and cause an intermittent misfire. I cannot tell you how many of these I have run across, where the customer already replaced all of the ignition components in an attempt to fix the misfire. There are multiple ways to identify a no fuel misfire. In this video we will cover a few of them. In the related videos posted lower on the page, I will cover more.

Symptoms
- intermittent misfire
- check engine light (P0300)

Fix
- clean or replace sticking fuel injector

Tests shown
- injector sound test
- secondary ignition waveform of a no fuel misfire
- injector voltage waveform showing a missing pintle hump
- misfire counters on a scan tool

Tools used
- Scan tool
- Lab scope
- Secondary capacitive pick-up
- Back-probing pin

Related videos
- How to test a fuel injector (open winding case study) Nissan
[ Ссылка ]
- How to identify injector flow problems (Toyota 1.8L) part 1
[ Ссылка ]
- How to identify injector flow problems (Toyota 1.8L) part 2
[ Ссылка ]
- Secondary Ignition Waveforms (common faults)
[ Ссылка ]
- Identifying type of misfire using tailpipe emissions
[ Ссылка ]



Playlist
- (Chapters 17, 18 and 19) Fuel Injector Testing
[ Ссылка ]

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.

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