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Misfire in cylinder one PO301 code

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

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