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Cat Man
Cat Man, Cat Engine Expert
Category: Boat
Satisfied Customers: 8412
Experience:  23 years Caterpillar Engine Experience
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I have a cat 3126 electronic injectors and numbers 123 are

Customer Question

I have a cat 3126 electronic injectors and numbers 123 are not firing
It gad a loud knock, I changed #2 injector and the knock went away but it is still firing weak on those 3 cylinders
Submitted: 1 month ago.
Category: Boat
Expert:  Cat Man replied 1 month ago.
Thanks for asking your question. I will try and help you out.
Do you know if there are any codes or the engine light is on?
Has the fuel pressure been checked?
Customer: replied 1 month ago.
No codes
Expert:  Cat Man replied 1 month ago.
Thanks for the information.
Has the fuel pressure been checked?
Customer: replied 1 month ago.
No
Expert:  Cat Man replied 1 month ago.
I would first check the fuel pressure.
The 3126 engine should have between 65-85 psi at all times. If low, you have ether plugged fuel filters, faulty fuel pressure regulator. Or a weak fuel pump.Please reply back if you need more help or have more questions. I am happy to assist.
Expert:  Cat Man replied 1 month ago.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.

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