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Misfire in cylinder one PO301 code

Tiny
MRFANTASTIC49
  • MEMBER
  • 1997 MERCURY COUGAR
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 8 MILES
I started getting code po301 and sometimes code po303 cylinder misfire. I changed the spark plugs wires and ignition coil and last rotated the fuel injectors. Still I cannot get rid of the misfire in cylinder one po301 code. I am stumped. Any ideas please?
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Monday, November 27th, 2017 AT 8:25 AM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Check compression's just to make sure that there is not a problem there. Also, check for a vacuum leak around the manifold and check fuel pressure and if all these are okay, get the injectors flow tested, start here.
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Monday, November 27th, 2017 AT 9:17 PM

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