My 02 f250, 325XXX has been putting out more black smoke from the tailpipe lately. Used to, it would smoke a little but only under heavy acceleration. Recently it has been smoking more easily as in under medium acceleration and produces much more smoke under heavy acceleration.

Injectors are still stock, I know that at least #8 has been replaced. Hpop is still stock, the turbo has been rebuilt with a billet 7+7 wheel from SP Turbo.

I have done the H&H w/ racor and the Riffraff FRX, both fairly recently. When installing the FRX I used the middle spring.

I'm pretty sure the issue is that something is not keeping up with the restored fuel pressure. I do not have a fuel pressure gauge installed and funds are somewhat limiting right now.

Current Ideas:
1. injectors are not atomizing the fuel correctly
2. hpop isnt firing the injectors at the right time or hard enough
3. plain old too high of fuel pressure

Any ideas on what to check or montior via forscan/torquepro?

 

Have you checked for Boost leaks and/or checked the turbo to make sure it turns freely?

 

Agreed, At 325k your issue is not likely over fueling , more likely the opposite and not enough air due to a worn part in the intake system.

 

sounds like too much fuel and/or not enough air but there could be a few reasons for that. I would at least buy an OBD link cable or bluetooth adapter and find a laptop to put ForScan on so you can keep watch the IPR and ICP numbers when you get on it. A better option is an EDGE Insight since you can mount it right in the corner of the dash next to the A-pillar but those are a little on the pricey side. You do it with the ForScan though and also check for codes and do a buzz test.

I would also check the air filter and that turbo is spinning freely, and also that the CAC boots are tight.

 

what ICP and IPR numbers would you think causes smoke ?

if anything I would think either of those out of spec is going to result in not enough fuel, I haver never heard of them causing to much fuel.

 

Forscan is great and everybody should have it but me thinks you would be better off with a boost gauge in this case.

 

I had something similar happening to my cousin not to long ago. Exessive black smoke and it happened from one day to another.
Went trough all sensor, checked for air leaks, clogged or stuck EBP - tried to find any leading clues here att FTE - and read what I could find about the subject.
It turned out to be the EBP line which where clogged in the tube itself and also where the tube are connected trough the brackett.
I replaced the tube with a new one, used a drillbit to open up the brackett and replaced the EBP sensor as the voltage where all over the place causing the pressure at sea level not to meet spec.
Also the tube where clogged but the pressure where going up and down att KOEO.

So the culprit in my case where both the sensor, brackett and finally the tube.
The smoke where black and heavy.

I have had customers complain about bad fuel economy and smoke. ICP and EBP are sensors that can affect both economy and smoke in a very bad way.

Helge

 

I do have forscan set up, and will look for boost leaks. I forgot to mention, I have also replaced the ICP sensor a couple of months ago and cleaned out the EBP sensor about a year ago but will check it again. I will see if I can get some ICP, IPR, MAP and EBP reading for yall tomorrow. Any guidance on a buzz test with Forscan would be appreciated as well.

 

How much boost are you making on a wide open pull? A stock 7.3 should hit 17-19 psi.

 

I did not get a chance to make any WOT pulls today or look for boost leaks due to attempting to clean the oily mess from a busted HPOP hose a couple of weeks ago. However, I did get to drive around the neighborhood (25-40 mph) monitored what i could. Attached is a graph from forscan the spike from just off of idle to 1750 or so rpm did produce a nice plume of black smoke. The following rise in rpm also produced a bit of black smoke but, barely enough to see in the mirror. Overall the smoke seems to be steady when sharply increasing throttle until the turbo catches up.

If there are any other parameters I should be monitoring please feel free to let me know.

 

Your ebp reading looks off, it shouldn't go below about 14.7 since that is atmosphereic pressure, try cleaning the sensor and tube out the sensor could be bad too. Also going by your map sensor you only maxed out at 3-4 psi of boost that whole time.

 

If he was only giving it partial throttle up to 40 mph then it probably only was making 3-4 psi and that would seem normal I think. I am guessing the turbo is probably fine if it was recently rebuilt like he mentioned. The EBP sensor and tube might be part of the problem. When I took mine apart a couple years ago it so coked up with carbon inside the sensor that would not budge that I knew that replacing it was the best idea. Also the tube was not holding pressure at all because of a big crack in a rusted out spot on one of the bends. What is the EBP sensor show for a reading with the truck just idling when you go to the panel view that just shows the numbers instead of the graph view? If the sensor is working it should follow the MAP sensor reading pretty closely which should be right around 14-15 psi at idle which is just atmospheric pressure (no turbo boost)

Beyond that my money is on pressurized leaks in the charge air circuit and possibly also the pre-turbine exhaust side. On an engine with that kind of mileage on it it would not surprise me. Tuning up the fuel delivery system might have agitated the problem by restoring optimal fuel pressure to the injectors.

 

Got a chance to make a few runs at WOT throttle today, driving around to warm up beforehand it did not seem to be smoking as much as it had been, kind of like its back to normal.



During these first two it did not seem to smoke too bad granted, I was only at about 80% throttle.




The last couple of times I was foot to the floor from a dead stop.

Both the MAP and EBP sensors seem to be working properly in my opinion.

And here is idle shortly after

I'm not sure what is causing the variation in idle speed, any ideas on that would be appreciated as well.


Also, I was talking to a diesel mechanic friend who was telling me that a long drive, like the one i did last week (27hours), and failing injectors can cause excessive black smoke for a little while and then it clears up, which makes sense but all 8 buzzed good.