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1995 Mustang 3.8 Cylinder 4 Misfire

6975 Views 8 Replies 3 Participants Last post by  a94cobra
Somebody please tell me where to go next. Scanned code P0304. I have swapped plugs, wires,fuel injector and the coil. I still have the same problem and dont have the money to just throw parts at it.
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As you know your code is a missfire on number 4 cyl, you may have a bad harness that plugs on the injector, crossed plug wires (not likely but can happen) or a bad PCM. Below you will find wiring for number 4 injector as well as your code read out.

Trouble Code: P0304 (3.8L V6 VIN 4 Std)
Cylinder Number 4 Misfire Detected

Print this code data

Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details
  • MISFIRE Details
  • MIL Details
Trouble Code Conditions:
DTC P0136, P0156, P0171, P0172, P0175, P1130 and P1150 not set, engine started, engine running under positive torque conditions, and the PCM detected a misfire a misfire in Cylinder 4 during the 200 revolution (Catalyst) or 1000 revolution (High Emissions) period. Note: If the misfire is severe, the MIL will flash on/off on the 1st trip!

Possible Causes:
  • Air leak in the intake manifold, or in the EGR or PCM system
  • Base engine mechanical problem that affects only Cylinder 4
  • Fuel delivery component problem that affects only Cylinder 4 (i.e., a contaminated, dirty or sticking fuel injector)
  • Ignition system problem (coil, plug) that affects only Cylinder 4
  • TSB 02-16-2 contains repair help for this code (LS & T-Bird)
  • TSB 03-14-4 contains repair help for this code for COP ignition
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