Fuel Injectors
Fleet Mechanic
Joined: Jun 2006
Posts: 1,589
Likes: 20
Some suggestions
If you can reach it, check to make sure the #3 FI wire harness connector is snapped into place.
Run a good heavy dose of FI cleaner through the fuel system
If you have not done so for a while, change your oil and switch to synthetic oil (5W-40)
DSMMH
Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
What exactly are the codes? Cylinder contribution/balance? circuit low? etc
Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
Black smoke is kinda indictative of a lot of things. I've actually known some trucks that have been tuned that a miss is not readily apparent. If the pulse width is changed just enough, it can disguise a miss. Shaking at idle would be just about the only way to determine a miss unless you are just hypersensitive to it.
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Freshman User
Joined: Mar 2010
Posts: 46
Likes: 0
Well, We did the buzz test with the engine off, and thy all tested out fine, but with the engine running, it threw code p0303. It is idling rough, and when I drive it, after about a mile, it starts cutting out then dies. It will start again after about 5 minutes and run rough. I havent noticed smoke, except right before it dies, it puffs out a bit of black smoke. I have changed the fuel filters, fuel pump, cps, and run a bottle of power service through it. I have also took out the egr and cleaned it up (it was pretty grimey). As soon as t warms up a bit outside, I'll go out and check the connections at the injectors
Elder User
Joined: Dec 2007
Posts: 971
Likes: 1
From: IA MN SD
After it dies, pull the lid off the under-hood fuel filter. Is it full of fuel? If not, have someone cycle the key till it's full. Then put the cap back on and try to start it.
If it starts and runs fine for a short time again, odds are you have an injector leaking compression gasses into the fuel rail.
If it starts and runs fine for a short time again, odds are you have an injector leaking compression gasses into the fuel rail.
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Fleet Mechanic
Joined: Jun 2006
Posts: 1,589
Likes: 20
Well, We did the buzz test with the engine off, and thy all tested out fine, but with the engine running, it threw code p0303. It is idling rough, and when I drive it, after about a mile, it starts cutting out then dies. It will start again after about 5 minutes and run rough. I havent noticed smoke, except right before it dies, it puffs out a bit of black smoke. I have changed the fuel filters, fuel pump, cps, and run a bottle of power service through it. I have also took out the egr and cleaned it up (it was pretty grimey). As soon as t warms up a bit outside, I'll go out and check the connections at the injectors
If you did the latter, then you could have crushed the filter. That in turn will restrict flow through the filter and not open the fuel shut off valve to allow fuel to the fuel rails. I learned this little tid bit when I installed my Airdog 2 fuel pump. Since my AD2 has two high quality filters, I was going to eliminate the engine fuel filter to reduce fuel pressure drop. When I removed the filter, the engine would not fire. Put the filter back in and she fired right up.
If your engine fuel filter is OK then I would leave it out and have someone turn the key on to see if you have fuel flow to the filter housing. Should fill up pretty quick. If not I would go to the fuel pump.
DSMMH
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Freshman User
Joined: Mar 2010
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I have checked all that before. The engine filter does fill and the filter looked good. I did, however break the stem taking the old filter out...it was stuck. I got a new stem and put it in, and then put a new filter on the cap and then installed it. If I do have an injector leaking compression gasses into the fuel rail, is there an o ring or would I have to change the whole injector?
Elder User
Joined: Dec 2007
Posts: 971
Likes: 1
From: IA MN SD
THIS ARTICLE from DieselDoctorsdts.com makes it sounds as though a new o-ring and copper seat may solve the issue, but I can't say for certain.
Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
No, 6.0s use the HEIU injectors and 6.4s use Piezo(sp?).
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Freshman User
Joined: Mar 2010
Posts: 46
Likes: 0
Ok, new segment in the saga. I just talked to my buddy...the diesel expert (or so he calls himself..haha) How do you check for leaks in the fuel lines? He says I might be suckng air from somewhere. Is there a way to pressurize them and then spray soap on them?
