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2003 Ford Focus Misfire

Tiny
ZHIBBS26
  • MEMBER
  • 2003 FORD FOCUS
  • 2.0L
  • 4 CYL
  • FWD
  • MANUAL
  • 122,000 MILES
This problem occurred when I noticed my car backfiring and missing when I would drive. I had a my car read and I hot a PO301 code. Then I got a PO304 code added. I switched the injectors to see if I could move the miss. I got the car read again and only the PO304 code came up. I put brand new plugs, wires and a coil pack. I did a compression test and it read 120lbs on each cylinder. I swapped injectors with a whole other set and its still missing. Can you help?
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Tuesday, December 8th, 2015 AT 8:24 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have a pro scan this for codes and freeze frame to see what sensor is causing the problem also check fuel pressure with a gauge auto parts rent that.
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Tuesday, December 8th, 2015 AT 9:44 AM
Tiny
ZHIBBS26
  • MEMBER
  • 2 POSTS
Ok, I also found a wire that was frayed. Ford called it a radio ignition interference capacitor. Would that cause my problem?
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Tuesday, December 8th, 2015 AT 4:34 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Only the way I said in first reply
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Wednesday, December 9th, 2015 AT 7:08 AM

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