Injector testing???
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Right. CCT will only show you if the PCM deems one cylinder to be out of whack, but a fault on the CCT alone doesn't necessarily mean something is wrong.
Perdel or rotational velocity readings will give you a visual so you can compare how each cylinder is performing in relation to the others, but it doesn't hold all the answers either.
Computer tests just help you narrow things down and tell you which cylinders might be suspect. Bench testing the injectors is the only way to know for sure, but if the engine passes the computer tests, and you're not seeing any performance or MPG differences, I'd be inclined to leave well enough alone.
Perdel or rotational velocity readings will give you a visual so you can compare how each cylinder is performing in relation to the others, but it doesn't hold all the answers either.
Computer tests just help you narrow things down and tell you which cylinders might be suspect. Bench testing the injectors is the only way to know for sure, but if the engine passes the computer tests, and you're not seeing any performance or MPG differences, I'd be inclined to leave well enough alone.
Thread Starter
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Senior User
Joined: Oct 2008
Posts: 466
Likes: 0
From: Ontario, CAN
I swear that I can hear a rattling noise in certain situations. Would that possibly indicate a mechanical problem within the injector? I could nearly buy new injectors for what it would cost to get them bench tested around here.
Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
People tell me that using Bio or whatever snake oils they have they can hear injectors being more quiet. Well, fact is, the injectors sit under the valve cover and the sounds would be muffled. In any case, they tend to buzz during operation so how can you hear them? With the fuel starvation issue from the dead head fuel return, you get a more noisy engine noise. To solve that, to some extent, Ford put a different injector in #8. When I installed the regulated return, we got it more quiet. Could it be that noise you are hearing? Also, the fuel system leaks and allows air into it. That is why we do the in tank mods. Because the quick connects can let in air after a while. They are great at holding pressure but that section of the tank is under vacuum.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Yea, like Aklim said, try using some fuel additive or Bio to see if that helps 
The additives change the combustion characteristics of the fuel, so it can help quit down that diesel sound. Air in the fuel also changes the combustion characteristics so that's why the regulated return and in tank mods also can help.
Another option is to buy fuel from somewhere else. This time of year, depending on your location, fuel at the pump has a mixture of anti-gel additives or #1 along with the other additives put in for ULSD. Maybe your truck just doesn't like where you've been buying fuel.
The additives change the combustion characteristics of the fuel, so it can help quit down that diesel sound. Air in the fuel also changes the combustion characteristics so that's why the regulated return and in tank mods also can help.
Another option is to buy fuel from somewhere else. This time of year, depending on your location, fuel at the pump has a mixture of anti-gel additives or #1 along with the other additives put in for ULSD. Maybe your truck just doesn't like where you've been buying fuel.
