How to find a bad injector - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 6 (permalink) Old 11-07-2011, 12:20 AM Thread Starter
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How to find a bad injector

How do you find a bad one or is there a way to tell if they are all worn out. 250k all orig.

97 F-350 Dually,7.3L,E40d,4.10 duralite filter, TS6POS chip,4" MBRP w/down pipe
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post #2 of 6 (permalink) Old 11-07-2011, 07:09 PM
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Re: How to find a bad injector

Normally if one is worn out, the others are not far behind it... With those miles. You might want to pull them and send them to an injector builder to flow them and test the tolerances, maybe replace worn parts or just get a set rebuilt for you... Just my .02

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post #3 of 6 (permalink) Old 11-14-2011, 12:11 AM
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Re: How to find a bad injector

Do a (CCT) Cylinder Contribution Test.
Various psd OBD2 programs like Autoenginuity can run CCT and much more...
It will find weak injectors and or wiring problems. CCT sequentially shuts down individual injectors comparing each cylinder's contribution compared to the group.
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post #4 of 6 (permalink) Old 11-14-2011, 01:05 AM
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Re: How to find a bad injector

Quote:
Originally Posted by roddy View Post
Do a (CCT) Cylinder Contribution Test.
Various psd OBD2 programs like Autoenginuity can run CCT and much more...
It will find weak injectors and or wiring problems. CCT sequentially shuts down individual injectors comparing each cylinder's contribution compared to the group.
From what I was told,CCT runs each Injector Rich, Then runs each one Lean then conpares the effect of each and what they contribute to each cylinder..

Also would run the test atleast 3 times and take the adverage,,


My past experiance has shown that the first is uasally differant than the 2nd unless there is somtheing odvious..

Good Luck
John
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post #5 of 6 (permalink) Old 12-19-2011, 05:43 PM
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Re: How to find a bad injector

Quote:
Originally Posted by roddy View Post
Do a (CCT) Cylinder Contribution Test.
Various psd OBD2 programs like Autoenginuity can run CCT and much more...
It will find weak injectors and or wiring problems. CCT sequentially shuts down individual injectors comparing each cylinder's contribution compared to the group.
will a Snap-On scanner run a CCT?
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post #6 of 6 (permalink) Old 12-20-2011, 05:44 PM
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Re: How to find a bad injector

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Originally Posted by wiltface View Post
will a Snap-On scanner run a CCT?

YES! CCT cuts one injector at a time to look for drop in load to see how much load that cylinder was caring. By an equation in the software used it can determine which cylinders are not working within specs. Be it weak injector, low compression ect ect. You WILL FAIL a CCT if your HPOP is weak best way to tell is get them flow tested or a buzz test will help too, listen how they buzz lould or soft. For example we just had a 2000 350 in the shop, buzzed back with 1&2 bad, CCT failed on # 1&2 ( truck was pouring white rich smoke out also) pulled injectors and half of clyinder one injectors is missing!!


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