Possible injector issue
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Senior User
Joined: Mar 2003
Posts: 489
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From: Western Kentucky
Possible injector issue
I have an early 99. It quit a couple of months ago and was about 2 quarts low of oil. I added the oil and it ran fan for another month. Then it did it again also low on oil, but this time it wouldn't start. If it sets for a few hours, it will start but run rough. It will then shut down and not start. It's like you turn the key off.
When it was running, I had it tested. It passed the buzz test, but showed low contribution for #3 injector & #8 injector. #8 I understand due to the timing of #6 & #8. I pulled #3 and was going to replace it with a new injector given to me, but it was an AD and mine are AB. It was suggested to check the harness before replacing the injector. I verified no broken wires and applied the quarter to the clip. It is still doing the same thing. Is it same to assume the injector is bad or could it be something else?
I am going to have it test again while it is not running. My daughters boyfriend is a mechanic and he has the testor.
When it was running, I had it tested. It passed the buzz test, but showed low contribution for #3 injector & #8 injector. #8 I understand due to the timing of #6 & #8. I pulled #3 and was going to replace it with a new injector given to me, but it was an AD and mine are AB. It was suggested to check the harness before replacing the injector. I verified no broken wires and applied the quarter to the clip. It is still doing the same thing. Is it same to assume the injector is bad or could it be something else?
I am going to have it test again while it is not running. My daughters boyfriend is a mechanic and he has the testor.
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
I'm not sure an injector will cause the truck to shut down like the key was turned off. A bad injector will cause it to run rough. You can have him do a buzz test and look at rotational velocity % with the engine warmed up, but I don't think this sounds like an injector issue.
How long does it take you to loose the oil (miles), and where does it go? 2 quarts low on oil shouldn't be enough to make the engine shut down. Have him pull the codes to see what else shows up.
How long does it take you to loose the oil (miles), and where does it go? 2 quarts low on oil shouldn't be enough to make the engine shut down. Have him pull the codes to see what else shows up.
Thread Starter
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Senior User
Joined: Mar 2003
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From: Western Kentucky
No codes show up. I did have the CPS replaced during the recall. When cranking, the tack is working, so the CPS should be OK.
It took about 3 weeks to loose the oil, but I have no visible loss. I've heard leaking injector orings can loose oil, but I don't know what is causing it to die. I have also replace the fuel filter during this time to see if it was stopped up.
It took about 3 weeks to loose the oil, but I have no visible loss. I've heard leaking injector orings can loose oil, but I don't know what is causing it to die. I have also replace the fuel filter during this time to see if it was stopped up.
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
If the engine dies like the key was turned off, it's usually a sensor or electrical type issue. Sounds like you have more than one issue going on here. Have you checked to make sure your chip isn't loose?
Post Fiend
Joined: Sep 2006
Posts: 7,426
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From: Sioux Falls, SD
Ask which sensor/testor he is using. If he can, check your injector control pressure (ICP) with key on engine off, and while running. Maybe it is an ICP issue.
Also, do you have a way to monitor fuel pressure?
Also, do you have a way to monitor fuel pressure?
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Thread Starter
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Senior User
Joined: Mar 2003
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From: Western Kentucky
I don't have a pressure gauge, but I have thought about making a testing gauge.
I had a sensor loose. I found the nut and put it back together. It was at the bottom of the fuel/HPOP area. I have been looking at a diagram and I think it was the Injector Pressure Regulator. After looking at the picture, I think mine may have been broken. Is this a dealer item? Does anyone know how much they run>
I had a sensor loose. I found the nut and put it back together. It was at the bottom of the fuel/HPOP area. I have been looking at a diagram and I think it was the Injector Pressure Regulator. After looking at the picture, I think mine may have been broken. Is this a dealer item? Does anyone know how much they run>
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Junior User
Joined: Sep 2007
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From: lakeland, fl
sounds like it could be an injector o-ring issue. if you dont mind pulling the injectors check all the top o-rings. if 2-3 are busted it wont crank no matter what you do. and it dont show on no tester.
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
You must have posted in the wrong thread. Leaking injectors will make a consistant problem, not a here and there problem like ggirten had.
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Senior User
Joined: Mar 2003
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From: Western Kentucky
Not sure about the oil loss. It was fuel this last time. While I had the injector out I went ahead and installed new ORings. It may have been a couple of different issues happening. I drove the truck all day yesterday and it runs great, no smoke and easy start. I even had a little romp that is gone.