No Start No injector pulse (shorted injector) part 1
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13 سال پیش
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This problem is specific to
This problem is specific to GM vehicles built from the late 80s through the early 90s. Here is a partial list of the cars that used this style fuel injector.
- 5.0 and 5.7 in the Corvette and Camaro
- 2.8, 3.1, 3300 (Chevy, Buick, Olds, Pontiac)
- 1.9 (Saturn)
- 4.9 (Cadillac)
The first time I ran into one of these, I mistakenly replaced the engine computer in an attempt to fix the no injector pulse condition.
It is strange that one shorted fuel injector can cause all the other injectors to not fire, but this is exactly what can happen with a group fired system. “Group fire” means there is only one transistor in the computer that controls all of the injectors at the same time.
Symptoms
- no start
- no injector pulse
- rough idle
- misfire
- starts and stalls
- failed emissions
Fix
- replace ALL fuel injectors
Tests shown
- how to measure injector current from a common location
- injector current ramp
- injector pulse test with a noid light
- how to verify injector power supply
Related videos
- No Start No injector pulse (shorted injector) part 2
No Start No injector pulse (shorted i...
- GM 3300 Intermittent no start rough idle (shorted injectors)
GM 3300 Intermittent no start rough i...
- How to test for shorted fuel injectors (1987-1994 GM Cars)
How to test for shorted fuel injector...
- Rough idle, false MAP codes intermittent no start (shorted injectors) GM Rough idle, MAP code 33, intermitten...
Playlist
- (Chapters 17, 18 and 19) Fuel Injector Testing
(Chapters 17, 18 and 19) Fuel Injecto...
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-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
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.
- 5.0 and 5.7 in the Corvette and Camaro
- 2.8, 3.1, 3300 (Chevy, Buick, Olds, Pontiac)
- 1.9 (Saturn)
- 4.9 (Cadillac)
The first time I ran into one of these, I mistakenly replaced the engine computer in an attempt to fix the no injector pulse condition.
It is strange that one shorted fuel injector can cause all the other injectors to not fire, but this is exactly what can happen with a group fired system. “Group fire” means there is only one transistor in the computer that controls all of the injectors at the same time.
Symptoms
- no start
- no injector pulse
- rough idle
- misfire
- starts and stalls
- failed emissions
Fix
- replace ALL fuel injectors
Tests shown
- how to measure injector current from a common location
- injector current ramp
- injector pulse test with a noid light
- how to verify injector power supply
Related videos
- No Start No injector pulse (shorted injector) part 2
No Start No injector pulse (shorted i...
- GM 3300 Intermittent no start rough idle (shorted injectors)
GM 3300 Intermittent no start rough i...
- How to test for shorted fuel injectors (1987-1994 GM Cars)
How to test for shorted fuel injector...
- Rough idle, false MAP codes intermittent no start (shorted injectors) GM Rough idle, MAP code 33, intermitten...
Playlist
- (Chapters 17, 18 and 19) Fuel Injector Testing
(Chapters 17, 18 and 19) Fuel Injecto...
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-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
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.
13 سال پیش
در تاریخ 1390/08/06 منتشر شده
است.
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