Misfiring Ford Escort ignition fault finding

Remove the plugs from the head. Insert into the coil wires. Make sure they are properly earthed on the engine. Crank the motor and check for spark at each of the plugs.
Refer to the diagram. Cylinders are connected as shown on the diagram in blue. 1 goes to cylinder 1(sparkplug furthest from coil pack), 2 to 2, 3 to 3 and 4 to 4(closets to coil pack).
To test the coil pack use a digital volt meter. Measure resistance between coil towers for coil 1(marked 1 in red on diagram) Value should be between 12000 and 14500 ohm. Do the same for coil towers 2.
Measure resistance between I and C1. If the measurement is more than 5 ohm the coil is defective. Do the same for I to C2.
Measuring voltage at I(Ignition start/run) to ground should be 10V.
I is connected to the 15A engine fuse. The radio interference capacitor is connected between this line and earth at the coil. Disconnect it to see if it cures the problem.
C1 and C2 connect to the powertrain control module.
Bear in mind that aftermarket coil wires may cause problems with misfiring, so see if you cant find an OEM coil wire to replace the broken one before replacing anything else.

1999 Ford Escort 2.0 liter SOHC L4 VIN "P"



Hope this helps (remember to rate and commen this).

Hope this helps. The ignition coil:

• changes low-voltage pulses from the PCM to high-voltage pulses.
• fires 2 spark plugs simultaneously.
• has 3 transformers.
  • One transformer fires the spark plugs for cylinders 1 and 5
  • One transformer fires the spark plugs for cylinders 2 and 6
  • One transformer fires the spark plugs for cylinders 3 and 4

Spark plug wires:

• carry high-voltage pulses from the ignition coil to the spark plugs.

The spark plugs:

• change high-voltage pulses to spark at the gap, which ignites the fuel and air mixture.

The firing order is 1-4-2-5-3-6.

For the 1999 Mercury Mountaineer:
I do not know if you have the 4.0L SOHC V6 or the 5.0L SOHC V8; however I have included both below:

For the 4.0L SOHC V6:
Firing Order:
1-4-2-5-3-6
Cylinders:
........(back)........
|...3...|.......|...6...|
|...2...|.......|...5...|
|...1...|.......|...4...|
.........(front)
Ignition Coil Connections:
..(back)
1...2...3
5...6...4- This is correct!
..(front)

For the 5.0L SOHC V8:
Firing Order:
1-3-7-2-6-5-4-8
Cylinders:
.......(back).......
|..4..|.........|..8..|
|..3..|.........|..7..|
|..2..|.........|..6..|
|..1..|.........|..5..|
........(front)
Ignition Coil Connections:
.........(back).........
|..4..7..|.....|..3..5..|
|..8..2..|.....|..6..1..|
..........(front)

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

the firing order is 1342 from the front of the engine back.