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
• How to test a fuel inj...
- How to identify injector flow problems (Toyota 1.8L) part 1
• How to identify inject...
- How to identify injector flow problems (Toyota 1.8L) part 2
• How to identify inject...
- Secondary Ignition Waveforms (common faults)
• Secondary Ignition Wav...
- Identifying type of misfire using tailpipe emissions
• Misfire troubleshootin...
Playlist
- (Chapters 17, 18 and 19) Fuel Injector Testing
• (Chapters 17, 18 and 1...
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.
27 окт 2011
