Loses power, suggested it might be a fuel pump or vacuum leak

Hi,

What can be expected? That's hard to tell. By replacing the EGR, we assume the wiring is good, the vacuum supply to the EGR is good, the controls are actuating correctly, and there is a clear passage through the intake allowing air to freely flow.

Is the P0401 the only code that is returning? Also, when it stalls, does it start right back up? Also, when this happens, how would you best describe it? For example, does it feel like someone simply turned off the ignition switch, or does it slowly lose power as if it is running out of fuel?

Let me know. Also, you are not a bother whatsoever. Please remember that. I'm here to do my best to help. I saw that in the first post you sent today and forgot to tell you this.

Take care,

Joe

Hi,

You are very welcome. I just want to help you get it fixed. The odd thing is that it feels like the key is turned off. An EGR issue would usually cause it to slowly stall or just run poorly.

Regardless, let me know what you find or if there is anything I can do to help.

Take care of yourself.

Hi,

I am sorry to hear this hasn't been resolved. If the P0401 is still present, we need to do is remove the EGR valve and check things ourselves. There are several things that can cause the code, but the code simply indicated an insufficient EGR flow problem.

Has anyone confirmed the intake where the EGR port is clean and free of debris? If not, that is where I would start. If it is clear, then we need to next test for an electrical issue that can also cause the issue. Take a look below and let me know if you are comfortable doing what is listed.

However, I would start by removing the EGR and inspecting the EGR port for restrictions. Follow the directions in pics 2 and 3 which are how to remove and replace the EGR. Once it is off, then check where it mounts on the intake manifold for evidence of carbon or anything that can restrict airflow.

Let me know what I can do to help.

Joe

See pics below.

Hi,

A combustion test is meant to check the level of combustion gases in the engine coolant. If there are gases, there could be an issue related to a leaking head gasket.

As far as the diagnostic test is concerned, that is certainly for you to see. If they can't provide it, don't pay them.

Let me know how things turn out or if you have questions.

Take care,

Joe

Hi,

Based on the codes you provided, it's getting too much fuel. If could be a few different things. However, I suspect it is fuel pressure related. Take a look below. I provided the info below related to both codes.

The first thing I recommend is to check fuel pressure. The fuel pressure regulator could be bad.

Let me know.

Joe

See pic below.

Hi,

If the mass airflow sensor is faulty, it can cause either a lean or a rich fuel mixture based on how it's reading. Do me a favor, we can do this one of two ways. First, you can try cleaning the MAF to see if it takes care of the issue.

Here is a link that explains how it's done. Note that you should purchase a cleaner made specifically for the MAF.

https://www.2carpros.com/articles/mass-air-flow-service

Second, clear the codes and disconnect the sensor. That will force it into a predetermined setting and should indicate a code for the MAF and not the other issue.

If you have a live data scan tool, check to see if the ECT (engine coolant temperature sensor) is signaling an accurate temperature. Do this with the engine cold. It should be very close to the ambient temperature. If it is faulty and telling the PCM it's -40F, the ECM doesn't know it's wrong and makes the fuel mixture very rich to run in such cold temperatures. See pic 1 for location.

Also, we could check the voltages at the O2 sensors to see if they are off causing a rich mixture.

Is the P0401 still active?

Let me know.

Joe

See pic below.

Hi,

Thank you for the update. I look forward to knowing if that takes care of the problem.

I'll watch for your reply.

Take care,

Joe

Hi,

Thank you for the update. I appreciate it. So what part are they telling you may be hard to find? The 3.0L v6 is an extremely common engine.

Regardless, take care of yourself, and please feel free to come back anytime. You are always welcome here.

Happy 4th of July!

Joe

Hi,

The lower intake manifold isn't difficult to find. The original part number for it is XF2Z9424EA. If you type in Ford part number XF2Z9424EA, it will bring up places selling it. The only issue is cost. They are expensive new. However, take some time and see if you can possibly find a used one from a salvage yard or even eBay.

Let me know if there's anything I can do to help.

Take care,

Joe

Where are you getting that information? I don't feel either of the vehicles they indicated would have a 3.0L.

In 1996, they had a standard 3.0L, one that could run on flex fuel, and one that had a duel overhead cam which I believe was in the SHO. It was a high performance. The part number I gave you is for the standard one or the one that can use flex fuel. If you do have the DOHC engine, that would be different.

Just to confirm, I looked up a 2012 E350 super duty. See pic 3. It either had a V8 or a V10 engine.

Let me know.

Take care,

Joe

See pics below.