Last shot at getting help on this fuel issue. - Page 2 - Ford Powerstroke Diesel Forum
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post #11 of 27 Old 03-14-2019, 12:09 PM Thread Starter
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Originally Posted by Mike Gs View Post
Air filter is clean - but did you check the entire intake for obstruction like a critter nest somewhere? Black smoke is too much fuel or not enough air. Up pipes ok?
Yep, keep in mind the motor hasn't been in the truck for 500 miles, no time for things like squirrel nests, and a nest wouldn't go away and come back based on temperature either.

Up pipes show no signs of leaks.

Keep the ideas coming! I'm checking everything that's suggested.
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post #12 of 27 Old 03-14-2019, 02:29 PM
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Originally Posted by Redlineauto View Post
Yep, keep in mind the motor hasn't been in the truck for 500 miles, no time for things like squirrel nests, and a nest wouldn't go away and come back based on temperature either.

Up pipes show no signs of leaks.

Keep the ideas coming! I'm checking everything that's suggested.
Ok- I think you are messing with us-
Can you please explain how you go 500 miles with no motor???
Good luck-
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post #13 of 27 Old 03-14-2019, 04:36 PM Thread Starter
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Originally Posted by Mike Gs View Post
Ok- I think you are messing with us-
Can you please explain how you go 500 miles with no motor???
Good luck-
Ok, I'll rephrase. The motor was put in less than 500 miles ago. Am I really the only person who's heard that expression?

But yes, truck move when push pedal.
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post #14 of 27 Old 03-14-2019, 04:42 PM Thread Starter
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Ooooh, and I got some numbers today. ICP reads 3000ish PSI at WOT, duty cycle around 50% which seems a little on the low side. Symptoms were the same as always today, but I didn't drive it enough to get past the stage of operation where it misses, which would have been good for comparing numbers. Between the oil leak and the fact that the flexplate sounds like it's plotting the worst possible time to shatter into a million pieces, driving it is an anxiety inducing experience.
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post #15 of 27 Old 03-14-2019, 04:58 PM
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Maybe I missed it, but when was the oil last changed?

I donít have a ton of experience diagnosing IPRs and what not but 3000psi at 50% sounds right, that indicates that you have a healthy hpop


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post #16 of 27 Old 03-14-2019, 05:11 PM Thread Starter
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Originally Posted by rappy700 View Post
Maybe I missed it, but when was the oil last changed?

I donít have a ton of experience diagnosing IPRs and what not but 3000psi at 50% sounds right, that indicates that you have a healthy hpop


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Oil was added then changed when the motor was put in the truck less than 500 miles ago. So there's maybe a couple hundred miles on 14 quarts of Mobil 1 Delvac, and it leaks enough that some of it is newer than that.
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post #17 of 27 Old 03-14-2019, 07:57 PM
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Originally Posted by Redlineauto View Post
That'll be next on my list. As a matter of curiosity, how does low fuel pressure result in the black smoke and terrible mileage? I know they can go together, I'm just not clear on the mechanics of why.

I can see how it would raise EGTs if it was running lean, but my understanding of black smoke is that it's unburnt fuel, which combined with the fact that it is DRINKING (think 5-6 mpg) fuel would make me think too much fuel, and I'm not clear on how that goes together with low fuel pressure.

Thanks!
Fuel pressure is a base test. Something that should really be qualified before moving forward.
I've seen excessive pressure caused by return issues.

Aside from that, Check eot reading cold. Make sure it's reading ambient after a cold soak.

Check map reading. See if it's skewed, or you're lacking boost with the issue occurring.

Check ebp reading.

Check baro reading.

The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low, and achieving our mark.
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Last edited by kaya; 03-14-2019 at 08:01 PM.
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post #18 of 27 Old 03-14-2019, 08:10 PM Thread Starter
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Will do. How could eot not be ambient after sitting?

EBP sensor is completely disconnected from the head, the motor had plug that refused to come out. EBPV is unplugged at the pedestal and is confirmed to be fully open.

Will check MAP readings tomorrow, that'll be an interesting way to double check the boost gauge. Does the truck record atmospheric pressure or do I need to call the airport?
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post #19 of 27 Old 03-14-2019, 08:14 PM Thread Starter
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Also part of my concern with the boost situation is that this is my first 7.3 and so I don't have a good baseline to compare it to. It seems to build boost well, fairly minimal lag, no obvious issues, but all my experience with forced induction vehicles is on small gas engines, and even that is fairly limited.

What boost levels should I expect at different points in the rev range under load, and how much turbo lag is acceptable?

Even if that's part of the issue, I don't think a lack of boost would cause a dead misfire like this, and only when the oil is cold.
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post #20 of 27 Old 03-14-2019, 08:16 PM
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What heís getting at with the oil temp is troubleshooting the sensor. Itís possible that the sensor is messing up and telling the truck that the oil is very cold or very hot and the PCM is trying to adjust accordingly. Not a very common problem in these trucks but canít hurt to check. Even if it is bad Iím not sure it would make the truck run as crappy as it is


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