Cylinder five misfire

Tiny
CHASE RIDDLE
  • MEMBER
  • 2002 FORD MUSTANG
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I have the car listed above GT model. It has a code p0305. I replaced the spark plugs, ignition coils, and injector. What could be the problem?
Friday, November 23rd, 2018 AT 7:23 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

The misfire could be from many reasons.

Below are some possibilities.

1. Low compression. There could be worn rings, burned valve or head gasket. This needs to be verified by a shop that will do the proper diagnostics.

2. Vacuum leak. A smoke leak will tell if there is a leak around cylinder five.

3. Injector not being commanded to fire from a failed PCM. A shop can use a noid light to confirm this. Easy check.

Roy

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/how-to-test-engine-compression

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Friday, November 23rd, 2018 AT 2:10 PM

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