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2003 Ford Focus Misfireing or missing

Tiny
MARTY MARTINEZ
  • MEMBER
  • 2003 FORD FOCUS
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 73,563 MILES
This started this past Friday. I took the car to Autozone and asked them to scan the codes. They said that it was a misfire and a misfire on #4 bank.
I changed the spark plugs and there was a slight improvement. But a little later, hour, it started again.
The motor light took a little while to turn off but, when I pushed the accelerator a little hard the light came back on. Also the misfiring started again.
I put my hand all over the spark plug wires and did not receive any spark at all.
What else can I do?
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Monday, June 28th, 2010 AT 8:01 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,355 POSTS
I need you to remove the new spark plug from #4 cylender and tell me what it looks like. Also, if the vehicle still has the OEM plug wires, I would replace them. Let me know what you find.
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Saturday, July 3rd, 2010 AT 1:45 PM
Tiny
MARTY MARTINEZ
  • MEMBER
  • 2 POSTS
I have changed the spark plug wires.I do not know which one is #4bank or cylinder. Looking at the motor, it would be the last plug on the very right, going from left to right. I took out this plug and it was a little black at the base of the electrode.
I also, took out all the plugs and made sure that all were still gaped correctly. That is when I saw the fourth plug a little black. The rest were clean.
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Sunday, July 4th, 2010 AT 11:45 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,355 POSTS
The black usually indicates that it is running rich. We may have a fuel injector problem or a fuel pressure regulator problem.

I need you to watch the following video and the review the directions on how to check fuel pressure and the regulator. You will need a fuel pressure gauge. Most parts stores will lend or rent one to you.

Check the fuel pressure and regulator and let me know what you find.

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

Joe
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Sunday, July 4th, 2010 AT 10:22 PM

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