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2003 Ford Explorer cylinders 1, 2, & 3 are fouling

Tiny
JAKESSPORT
  • MEMBER
  • 2003 FORD EXPLORER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 104,000 MILES
What could cause bank one to run rich and foul out the plugs. I have changed both o2 sensors on bank one, put in new plugs and wires. The truck stutters very bad when I put it on drive and have my foot on the brake.
Thursday, January 14th, 2010 AT 11:43 AM

11 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
I want you to check fuel pressure, and fuel pressure drop off. I would like to know if you have fuel injectors that are sticking.

Here is a how to. Remember, pay special attention to the fuel pressure drop off. That is when you shut the key. THe pump stops, but the system should maintain pressure for some time.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

Let me know what you find.

Joe
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Thursday, January 14th, 2010 AT 8:27 PM
Tiny
JAKESSPORT
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  • 6 POSTS
I have just checked the fuel pressure, and it has remained the same, it hasn't dropped off. What should I try next resting at 62 lbs of pressure
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Thursday, January 21st, 2010 AT 12:36 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Okay, that tells us there is no leak at the injectors or other places. I have to ask, does the 2003 have one coil or one for each cylender. Sorry, 7 years ago I knew this but I'm getting old. (LOL)

Joe
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Thursday, January 21st, 2010 AT 7:16 PM
Tiny
JAKESSPORT
  • MEMBER
  • 6 POSTS
It has one coilpack for all six cylinders
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Thursday, January 21st, 2010 AT 8:28 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Have you checked the oxygen sensor?
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Thursday, January 21st, 2010 AT 10:02 PM
Tiny
JAKESSPORT
  • MEMBER
  • 6 POSTS
I replaced both of them on bank one, and there was no change
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Tuesday, January 26th, 2010 AT 11:59 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
The only other thing I can think of is the PCM. For only one side to be running rich, the injectors must be firing more fuel than the other bank.
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Tuesday, January 26th, 2010 AT 1:34 PM
Tiny
JAKESSPORT
  • MEMBER
  • 6 POSTS
Is there any way I can test the pcm. Where would you suggest finding one? Does the PCM need to be flashed to my VIN
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Saturday, January 30th, 2010 AT 7:38 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
You will need special test equipment to check that. As far as getting one, I would suggest a salvage yard. However, make sure it has the exact same part number.
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Saturday, January 30th, 2010 AT 11:59 PM
Tiny
SCOTTY DEE
  • MECHANIC
  • 592 POSTS
Before you go to the trouble of replacing the PCM, I see no mention of retrieving any present trouble codes. Are there any codes present?
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Sunday, January 31st, 2010 AT 9:50 AM
Tiny
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  • MEMBER
  • 6 POSTS
I got a run tested pcm from a salvage yard, it has the same numbers exactly, but when I put it in the car would not start.
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Wednesday, March 31st, 2010 AT 1:25 PM

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