Ok, so tranny shop says no codes, nothing wrong with the tranny. They say its all engine and no power. Now what? Shop said engine is not producing enough power to engage the torque and causing pressure in lines to build as a compensation and then bang into gear until warmed up. Flushing tranny, changing fluids/filter and moving on to the engine.

Any thoughts of where to start? Code p0284 is the only one i have at this time. I need help!

 

What year make,model and engine is in your truck. Having the code is a start but still need to know what your working on.

 

Yeah guess that would help. Talked so much about these freakin issues, i thought everybody knew...haha
2002 f250 super duty 7.3. 165,450 miles.

 

P0284 is common for these motors if the #8 injector is an AE instead of the AD injector. I would disregard this code for now unless your engine is running rough or has high blowby.

Power is generated by compression, fuel, and air. Start with air induction: air filter, turbocharger, intercooler and piping. Also the MAP, EBP, and Barometeric pressure sensors contribute. If your engine seems to be running smooth, then I would concentrate on air induction first.

If you have low compression, you will have hard starts, low power, and most likely exhaust smoke and probably jet fuel smell to exhaust.

You can check that you have 60 psi fuel pressure. If not, it could be filter, pump, or tank obstruction.

There could be a number of things causing low torque/power. I am sure there is another member that has way more knowledge than I do about this, but this is a start.

Wouldn't hurt to get a second opinion from another trans shop though.

 

Well that is the code for cylinder 8 contribution balance. So with number 8 not contributing what the shop is saying could be a possibility. I have seen on the 6.0 side here that a bad injector was causing transmission to act weird. And it has been noted by mark k an engineer on the torque shift trans and I believe the 4r100 as well but I could be wrong. 165k seems a bit premature for a 7.3 injector but if that's the problem there's no way around it sometimes things fail is there a shop around you that could run a contribution test on the injectors if others are low you could get them while your in there. That being said I'm no expert I the 7.3 so I wouldn't tear into it on just my say so but the contribution balence code seems to point you in the right direction especially if it doesn't have a bunch of other codes or problems but maybe you do have some other stuff I going on too since you've been talking about all your other issues on here I just have seen any of your other threads. We also have a 7.3 specific section that at least for some stuff maybe of more help than the general super duty section I'm sure there's a few guys over there that live and breathe 7.3 and know way more about the motor than I do and just stay over there but your not in the wrong place either by any means

 

I agree that it is a possibility, but I would not get too concerned about it yet. On later 7.3 engines, Ford decided to use a different injector (AE) in the #8 cylinder, and it seems many of the earlier 7.3s were updated to the AE injector. It is pretty common to get a #8 cylinder contribution error dtc because the AE injector is fueling differently than the 7 other AD injectors. I am not saying you don't have anything wrong, but just don't worry about it until you get further testing done.

 

Guys, thank you so much. Im dropping off at the mechanic tomorrow afternoon and he is going tonrescan everything. Family has used this guy for years so the trust factor is there. He seems to think something with the ebp...in my vast inexperienced knowledge, i feel like its diesel restriction. On the way home, i seem to have to give a little more tuan half pedal for good power to come out.

 

Rookie questions and updates here....mechanic called me yesterday to say that the IDM readiness scan would not show any data from any of the sensors. Stopped by to talk after work and watched him try again. N/A on all sensors with the scan. Said he had some body codes and instrument cluster codes. Here's questions....we scanned it over the weekend two weeks ago and got the p0284 Pcm code. Would that scan have not connected and scanned the IDM? And, if it is the IDM would that cause the sluggish low power feeling like it isn't getting enough diesel? Mechanic said he is tracking down today. Thoughts, comments?

 

Some of your question I don't fully understand. As far as I know, there are no IDM sensors that the scanner reads. The PCM reads the engine sensors and IDM. If the PCM is not communicating with IDM, you would get a P code for that. If your mechanic can try an injector buzz test, then that will throw some IDM related codes if there is a fault. Since you have body and instrument codes (different modules), your data link is working. 2 weeks ago with the p0284 code, you were communicating with PCM. Is your mechanic able to read the cylinder contribution?

All the engine sensor data that the scanner reads is coming from the PCM. If the mechanic can't get the sensor data, then there is something wrong with the PCM or the communication link to the PCM, or the scanner itself.

 

I don't know squat about Diesel Motors.
But the advise you guys always give sounds solid. Its nice to be on a Forum where the responses are not the same as your Fishing stories.

 

Ok, a little more info to help 'cipher. Mechanic changed evbp sensor and removed/inspected evbp tube. Ran autotel scan while running after and still no exhaust pressure. 1.2 -2.0 on ebp and mass flow reading 14.2-15.4. Smoke tested and...poof all over both up pipes. So, could it be that simple that the up pipes are leaking thT bad to cause the symptoms and readings?

 

Oh and my water pump started leaking badly. When it rains....
At least the mechanic got the scanner to communicate