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I am having problems with the fuel injectors.

Customer Question
I am having problems with the fuel injectors.
Submitted: 2 years ago.Category: GMC
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Answered in 51 minutes by:
9/2/2015
GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago
Toolhut
Toolhut, ASE Certified Technician
Category: GMC
Satisfied Customers: 551
Experience: Owner of a mobile diagnostics company assisting auto technicians with difficult vehicles
Verified

Hi, My Name is***** have over 20 years experience repairing vehicles. I am a ASE Certified Master Auto Technician. I am confident we can resolve your problem together.Please remember I don't know your skill level. I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies to get to a satisfactory resolution.I also try to give all of the information you may need expecting a positive rating. If there is any reason I cannot get a positive rating please let me know.

What kind of trouble are you having?

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Customer reply replied 2 years ago
I bought this truck with this problem already so I am not sure what was done previously other than the fuel injector driver module was replaced. The truck is currently running with 3 injectors and there is no pulses on the other injectors. I called a technician that had a snap on computer and he came by and did a complete reset and the truck ran great with all 8 injectors working perfectly. The next day I went to crank up the truck and we were back to square one (3 injectors working and no pulse to the rest of the injectors). Unfortunately after the truck is off for a period of time it loses its synchronization. What should I do?
GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago

Hi, My Name is***** have over 20 years experience repairing vehicles. I am a ASE Certified Master Auto Technician. I am confident we can resolve your problem together.Please remember I don't know your skill level. I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies to get to a satisfactory resolution.I also try to give all of the information you may need expecting a positive rating. If there is any reason I cannot get a positive rating please let me know.

My suspicion is that either your FICM module has failed or you have a shorted fuel injector causing trouble in the FICM. I would check the resistance of the injectors at the FICM using the schematic I have attached. If the injector resistance checks out I would replace the FICM and if it doesnt I would replace the injectors

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Customer reply replied 2 years ago
I did not receive the attachment to check the resistance on the injectors. Also if I replace the FICM does it need to be programmed or synchronized?
GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago

Yes it will need to be programmed

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Customer reply replied 2 years ago
Is a reset with the snap on scanner sufficient? or Is there an other process to program the FICM?
GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago

You have to program the FICM. Some of the remans come programmed and for that the snap on reset is sufficient

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GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago

It has been a couple of days since I have heard from you. Do you still need assistance? I have also noticed that I have not received a rating from you. If for some reason you question did not get answered please reply. I am only compensated for my time when you leave a positive rating. Your understanding is appreciated.

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Toolhut
Toolhut
Toolhut, ASE Certified Technician
Category: GMC
Satisfied Customers: 551
551 Satisfied Customers
Experience: Owner of a mobile diagnostics company assisting auto technicians with difficult vehicles

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