Trusted Contributor

Re: c9 running rough

you might have 1 or 2 failing fuel injectors.

i dont know if your Heui pump has ever been modified.


Re: c9 running rough

C9  marine engines are acert engines only way u can know ifan Injector is become weak is to know the fuel duration and compare it with the other injectors and that is only possible with with a cat program ELECTRONIC TECHNICIAN AND AN ADAPTOR But u can check by opening the vave cover n checking the harness conecters of all injector to see if on is loose  it can have a o ring in the feul section of the injector is weak other wise to do solenoid test u requier a E.T. TO hear the click of the solenoid to know which is weak checkthe  feul transfer pump as feul becomes thin when it reaches that temp 

New member

c9 running rough

ive got a c9 2006 in freightliner all of a suden started running like it has a miss in 1 cyl.and below 170 degrees very low power with a miss after reaching 170 seems to run better.