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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8560
Experience:  I am ASE Master Truck Certified.
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How to diagnose a bad fuel injector in a cat 3406b

Customer Question

How to diagnose a bad fuel injector in a cat 3406b mechanical engine
Submitted: 6 months ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 6 months ago.
Thanks for asking your question. I will try and help you out.
Does the engine have a miss? Or does it smoke and run rough?
Customer: replied 6 months ago.
Smike and runs like its getting no fuel
Expert:  Cat Man replied 6 months ago.
Thanks for the information.
Does it smoke at idle or when you rev up?
If so, I like to break each injector line on the fuel pump off one at a time. If an injector is faulty, the smoke will go away. That's the faulty injector.
You can also remove all the injectors and have them pop tested. Pop testing verifies spray patten, valve opening pressure, and leak down.Please reply back if you need more help or have more questions. I am happy to assist.
Expert:  Cat Man replied 6 months 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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