Fuel related code

Tiny
DIVIDES
  • MEMBER
  • 2007 FORD MUSTANG
  • V8
  • 2WD
  • MANUAL
  • 177,000 MILES
Have these codes. Car runs and drives but I can tell something isn't right, the intermittent is most likely from the coil but the fuel sensor is that common on these? And where is it located?
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Tuesday, September 28th, 2021 AT 5:21 PM

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Tiny
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  • MEMBER
Here it is, help with which o2 as well will be appreciated.
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Tuesday, September 28th, 2021 AT 5:29 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The oxygen sensor (bank 2 sensor 2) will be on the driver's side. See pics 1 to 3 below.

Now, the idea that it is stuck lean could mean a few things. However, the first thing I would check for is either low fuel pressure or an engine vacuum leak. A leak or low pressure can be the cause of the misfire code as well.

Here is a link that explains how to test the oxygen sensor. If you find fuel pressure is good and there are no leaks, follow this link:

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

Let me know if this helps. Also, let me know if there are any strange odors or sounds from the exhaust. One last thing. Is this a 4.6L or 5.4?

Take care,

Joe

See pics below.
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Tuesday, September 28th, 2021 AT 9:00 PM
Tiny
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4.6, exhaust is definitely not stock. So confused, so check fuel pressure first, what should it be?
If it is good it is most likely the sensor?
Bank 2 meaning after the catalytic.
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Wednesday, September 29th, 2021 AT 5:59 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Here is what to do: First, we need to check for vacuum leaks. If there is one, it could be the cause of the lean fuel mixture.

Here is a link that explains how it's done. Let's do this first before we move on to anything different.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know what you find. Your findings will determine what we check next or if there is a need to check anything else.

Let me know. Hang in there. We'll get through this. I'm here is you have questions.

Take care,

Joe
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Wednesday, September 29th, 2021 AT 7:00 PM
Tiny
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Do you know what the normal range fuel pressure should be? No vacuum leaks. Changed coil and code is gone, but it still does this in the video when I hit the pedal fully, not gradually, as if it's out of fuel.
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Monday, October 4th, 2021 AT 10:10 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

As far as the fuel pressure, I attached the manufacturer's specs below. Note I highlighted a 4.6L V8. If you have the 5.4L, the pressure is the same.

Here is a link that explains in general how to check the pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If possible, place the phone near the exhaust so I can clearly hear what it's doing when you hit the throttle. I tried listening several times, but the sound quality on a computer limits what I hear. Hopefully, placing the recorder closer to the exhaust will help.

I also noticed the engine has some slight backfires when the throttle was released. Are there exhaust leaks? If so, are they before the catalytic converters?

Let me know what you find.

Take care,

Joe

See pic below.

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Monday, October 4th, 2021 AT 7:16 PM
Tiny
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Am not seeing a fuel pressure port on the fuel rail.
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Tuesday, October 5th, 2021 AT 9:52 AM
Tiny
DIVIDES
  • MEMBER
Pressure via obd is 39 with engine off, when running also 38-39, fuel rail pressure volts 2.74.
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Tuesday, October 5th, 2021 AT 2:32 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The pressure is perfect. Also, the FRPS voltage seems fine as well.

I dug around a little with regards to the P0193. See pic 1 below. If you look at pics 2 and 3, they provide the location of the FRPS.

In pic 1, the manual indicates to use pinpoint test DD. I attached that diagnostic list for you as well. However, it is very extensive. Take a look at it and let me know if this is something you feel comfortable doing.

Before attempting the diagnostics, make sure the connector at the sensor is in good condition, free of damage and corrosion.

Let me know,

Joe

See pics below.
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Tuesday, October 5th, 2021 AT 7:21 PM
Tiny
DIVIDES
  • MEMBER
The rail sensor took care of the codes. But am still having a minor issue that if you rev it up high it comes down all the way to below 500 RPMs before it levels off, and sometimes will cause it to stall if am going down the road and put it in neutral. What are things that can cause such things?
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Tuesday, October 12th, 2021 AT 9:57 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The idle air control valve (IAC) is responsible for maintaining the idle speed. However, based on what you experience, it could be an engine vacuum leak as well.

If you look below, I attached a pic of the IAC. Make sure the connection is good and make sure the throttle plate fully closes. If everything looks good, try servicing the IAC. Here is a link explaining how it's done:

https://www.2carpros.com/articles/idle-air-control-valve-service

Before jumping right into the IAC, confirm there are no vacuum leaks. If nothing is found, then go to the IAC.

Let me know what you find or if you have other questions.

Take care,

Joe

See pic below.

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Tuesday, October 12th, 2021 AT 5:39 PM
Tiny
DIVIDES
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Thanks. The picture is showing the throttle body and the sensor on the left of it. I cleaned the throttle body but the sensor on the left is not something that can be cleaned, I removed it and it looks like a flathead screw driver that just sits inside this sensor, I also cleaned the map, so far so good, thanks.
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Wednesday, October 13th, 2021 AT 8:39 AM
Tiny
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Only thing that is strange is the way it revs, I have not owned a GT in a while but I assume this isn't right. In the video you see how the RPMs respond? If I floor the pedal all of a sudden I get this hesitation, more in the exhaust than the engine itself. If I slowly hit the gas pedal and steady it does not happen, possibly the fuel filter? And no issues while driving, I just cannot floor it while driving yet before I change the clutch as its shot.
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Wednesday, October 13th, 2021 AT 8:42 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

It sounds like a misfire. Have you gotten any misfire codes?

Joe
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Wednesday, October 13th, 2021 AT 5:05 PM
Tiny
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I did before for coil 2, but after I changed the coil it went away, so it's not misfiring. Is it possible to get a misfire just on load? Possibly the plug is not good enough?
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Wednesday, October 13th, 2021 AT 5:54 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

When you hit full throttle, a lot of air and fuel get into the cylinders. So, it could misfire if the plugs are worn or there is another issue with the ignition system. When was the last time it was tuned up? Also, have you pulled plugs to inspect their conditions?

Joe
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Wednesday, October 13th, 2021 AT 5:58 PM
Tiny
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I will check the plugs tomorrow, most likely still factory, lol.
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Wednesday, October 13th, 2021 AT 6:06 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Wow! If they have 177,000 miles on them, you got your money's worth from them.

Let me know. I'm interested in knowing what you find. Also, when you pull the coil off the plug, check to see if there is any oil down inside the tube or on the boot.

Take care,

Joe
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Wednesday, October 13th, 2021 AT 6:17 PM
Tiny
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10-4.
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Wednesday, October 13th, 2021 AT 6:21 PM
Tiny
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Never seen these plugs before and don't even know what to look for.
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Thursday, October 14th, 2021 AT 8:50 AM

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