99 7.3 acting like it is starving for fuel. HELP - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 09-01-2013, 09:24 PM Thread Starter
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99 7.3 acting like it is starving for fuel. HELP

Hey everyone, I know... this same feed has popped in here numerous times. But I have yet to find the answer that I am looking for. The other day I came home from work, then ten minutes later realized I had forgotten to stop and buy a can of chew sl I went to get back into my truck and it wouldnt start. SO. to make a long story short. SOMETIMES the truck starts right up when its cold. Sometimes it takes a little while. When it does start it runs fine until the truck has been warmed up for about 10 minutes or so. Then, it bucks, jerk, and literally DUMPS blue smoke like there is no tomorrow. If you feather the throttle it kind of goes away. But not necessarily. I have changed the ICP, cam sensor, fuel filters, oil change, new batteries, all within this month. When I hook it up to my snap on scanner it never ever gives me an active code. Its always a stored code. And theyre always different. Mostly a turbo boost voltage code and something with the tranny. OH, when it starts bucking it will turn the overdrive off. Someone please please help me. I have had multiple people look at it, and we are all lost and confused. This truck means the world to me and I cannot stand seeing it as a driveway ornament. Thank you in advance.
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post #2 of 12 Old 09-01-2013, 09:32 PM
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Need to run tests, not scan for codes.
Buzz test, and cylinder contribution.
I'm thinking UVCH, or maybe low fuel pressure?


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post #3 of 12 Old 09-01-2013, 09:35 PM Thread Starter
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Ok where could the low fuel pressure be coming from? Its beyond me. Did the buzz test thag came out fine. My boss keels telling me fuel pump but I do not understand how if it only does it when its warm.
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post #4 of 12 Old 09-01-2013, 09:36 PM
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If it's when warm you could have a high pressure oil leak.


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post #5 of 12 Old 09-01-2013, 09:36 PM Thread Starter
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When it first died my CEL and water in fuel light flashed at me. I have since flushed tank and gone through enough fuel to cross that out.
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post #6 of 12 Old 09-01-2013, 09:38 PM Thread Starter
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Ok. From the hpop?
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post #7 of 12 Old 09-01-2013, 09:39 PM
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From the high pressure oil system. Where? Idk. Look for oil leaks.
You can also look in the fuel bowl for oil after it starts running badly. Key off of course.


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post #8 of 12 Old 09-02-2013, 07:50 PM Thread Starter
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Well its leaking down my exhaust pioe from somewhere. Im a newbie obviously
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post #9 of 12 Old 09-02-2013, 08:25 PM
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You need to clean all the dirt and oil off, and find where it's coming from.


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post #10 of 12 Old 09-03-2013, 11:35 AM
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Quote:
Originally Posted by niemeyer1130 View Post
Ok where could the low fuel pressure be coming from? Its beyond me. Did the buzz test thag came out fine. My boss keels telling me fuel pump but I do not understand how if it only does it when its warm.
Fuel pump is a motor. Motors dont like heat. Old motors especially dont like heat. When a fuel pump heats up, it acts up. It heats up from running. I know from experience with cars that when a fuel pump goes bad, it gives symptoms that are pretty obvious (similar to the ones you and I are experiencing). I am starting to go against the "common knowledge" that these trucks dont have fuel pump issues. I will be changing mine next week. Hopefully it fixes your problem and hopefully it fixes mine as well.
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