Code P0302, cylinder misfire?

Tiny
MOUNTAINMAN97
  • MEMBER
  • 1997 MERCURY MOUNTAINEER
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 156,000 MILES
Chugs in overdrive idles rough, throws code p0302. When I check cylinder 2 plugs look good, light brown tinge color, put new plugs and wires all cylinder still same problem, plug never looks fouled on any cylinder. Don't think it's the injector because plugs look good. No codes other than p0302.
Wednesday, March 8th, 2023 AT 1:27 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,622 POSTS
It still can be the spark plug just to let you know. I would do a full tune up including coils, wires and plugs. Here is a guide to help you step by step and I have included how to change the ignition coils out as well in the images below.

Replacement Spark Plugs (Either side) .................... AWSF32EE

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

Make sure you change ethe plugs wires one at a time. Check out the images (below). Please let us know what happens.

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Wednesday, March 8th, 2023 AT 1:19 PM

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