Changed plugs and wires, injectors, has mis and code p0305 compression #1 145, #5 155 1996 ford explorer 4.0l

P0305 is telling you that number 5 cylinder is missing. It will need to be further diagnosed, plug, wire injector, compression test ect.

If you had code P0305, I don't know why they would have done anything to the #2 cylinder but if they have already replaced the plugs, wires and injector; here are a few more items to check:
1) Check connections from ECM. Look for any corrosions or bent/broken pins.
2) Check the fuel line pressure
3) Check the engine compression
4) And if the above are good, then you will probably have a defective ECM

P1401 Differential Press Feedback EGR Circuit High Input
Your EGR port is plugged. Replace your EGR valve, and clean the ports
A code P0302 may mean that one or more of the following has happened:

• Faulty spark plug or wire
• Faulty coil (pack)
• Faulty oxygen sensor(s)
• Faulty fuel injector
• Burned exhaust valve
• Faulty catalytic converter(s)
• Running out of fuel
• Poor compression
• Defective computer
• A code P0305 may mean that one or more of the following has happened:
  
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
  • A code P0301 may mean that one or more of the following has happened:
    
    • Faulty spark plug or wire
    • Faulty coil (pack)
    • Faulty oxygen sensor(s)
    • Faulty fuel injector
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Running out of fuel
    • Poor compression
    • Defective computer
    • A code P0302 may mean that one or more of the following has happened:
      
      • Faulty spark plug or wire
      • Faulty coil (pack)
      • Faulty oxygen sensor(s)
      • Faulty fuel injector
      • Burned exhaust valve
      • Faulty catalytic converter(s)
      • Running out of fuel
      • Poor compression
      • Defective computer
      • p1409
      • EGR Vacuum System Leak - Read Our Article on EGR Valve Codes For Help With This Oldsmobile Check Engine Light Code

Stan the Man,here's a link to your P0305 code,go thru the causes and see if it is there,do you have a warranty,take to dealer,they should fix for free.

Problems are not related. Concentrate on the P0305 first.
Cylinder 5 miss fire. Go with #1, #2 and #8 first. one at a time
The other code is gonna take a mech with some test equip.
Good luck

• Faulty spark plug or wire
• Faulty coil (pack)
• Faulty oxygen sensor(s)
• Faulty fuel injector
• Burned exhaust valve
• Faulty catalytic converter(s)
• Running out of fuel
• Poor compression
• Defective computer

cylinder no. 5 misfire detected. Check the spark plug, the spark plug wire, the fuel injector, The fuel injector o-ring (if the o-ring is bad, no compression). You can swap the spark plug or wire with a good cylinder and if the problem moves over then you've found your problem. Same rule with the injector.

http://groups.yahoo.com/group/villagerquest/

The DTC (Data Trouble Code) P0305 is the generic OBD-II DTC for "Cylinder 5 Mis-fire Detected", and it means that the OBD-II control unit has detected a problem with the #5 cylinder.

The problem could be a faulty spark plug, or a spark plug wire for the #5 cylinder, or the coil for that cylinder could be faulty (2.7 liter), or the distributor or distributor cap could be faulty (3.0 liter), or the fuel injector for the #5 cylinder could be faulty.

Before you look for any electrical problems causing the mis-fire on the #5 cylinder, first do a compression check to be certain that the mis-fire is not caused by a mechanical problem.

Here are the firing order diagrams for the 2.7 and the 3.0 liter enginesto help assist you.


2.7 liter



3.0 liter

po123-tps curcuit high---po138-02 sensor high volts bank 1 sensor 2,--po205--injector curcuit open cylinder 5,---po305-- misfire cylinder 5,--po300 random/multible mis fire,

Sounds like either a bad plug wire, or coil pack. This is about all that would cause the misfire.