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sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 21418
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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holden colorado: i have a 3ltr diesel 2010 colorado which has

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i have a 3ltr diesel 2010 colorado which has developed a knock when under load .My dealer has had the rocker off and ckecked all a settings and found no wear .The motor has done 87000 and been fully serviced.
I have heard of this problem before and been told it could be caused by a faulty injector .
What is your diagnosis.
Thanks Dick

Hello and welcome to JustAnswer!


It is definitely possible that an injector can cause a knock noise. If an injector has failed internally then it can cause excessive fuel to be injected and it will cause a fuel knock. The should be able to do an injector kill test which allows then to kill each fuel injector one at a time with it running. If the noise goes away with a particular injector killed then that injector has likely failed. It's possible that you could have a rod bearing or piston issue and the noise would usually get better with the injector killed, but if it goes away completely then replacing the injector should take care of the noise.

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