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2003 Ford Focus Missfire

Tiny
GASM19
  • MEMBER
  • 2003 FORD FOCUS
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 50,000 MILES
The car runs rough under 1000 rpm, it comes to vibrate. The scanner tells me PO316 and PO304, cylinder 4 missfire. This start when I tuned up the car. Change spark plugs, leads, filters and clean injectors, the new cables has 2.35, 2.90, 3.74 and 4.24 X 10 K ohms. I got some liquid on the exhaust. Hoe can check the ignition module or coil?
Thanks in advanced.
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Sunday, December 9th, 2007 AT 7:44 PM

1 Reply

Tiny
GASM19
  • MEMBER
  • 2 POSTS
I checked spark in all four wres, there is spark on all leads and spark plugs. I checked the PCV and I shaked, it rattle so I put it back. I looked for vacuum leaks, it don´t look any one.
One thing I forgot tell about this fail, it is that I cleaned the inyectors from a comercial ready to use cleaner, in a can with depress valve, I put the valve all the way in, I never have a pressure gauge, it colud be the number 4 inyector damage for this maybe overprssure?
Another thing I noticed, when the car is running, I disconneted the number 4 spark plug lead and the rough appears to smooth. When I put it back, the rough starts again. I took off the iar duct from the acelerator body and turn the butterfly, and I can see inside kind of wet.
Thanks again in advanced. :D
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Monday, December 10th, 2007 AT 12:06 AM

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