No power to coil i have replaced the distripertor cap,rotter,crankshaft positioning sensor,battery,and the coil .i also checked all fuses in both fuse pannels. the jeep ran fine before vacation, older son left back hatch open for two weeks must have drained something besides the battery. do you have any ideals for me? please send any reply to address [email protected] thank you, mr.don

Don't know where you see R-1 , ford use's F-1 80 amp fuse under hood fuse box . Fuse F-4 20 amp located in the under hood fuse box supply's battery voltage to the ignition coil . The crankshaft position sensor is what triggers the coil's . The crankshaft position sensor receives is power (voltage) from the PCM - engine computer . Your best bet , take it to a qualified repair shop.

Sounds like main fuse at battery, has it got a breaker module? Check if power getting to alternator or starter main feeds?

If you're getting a code for no RPM, the PCM is not receiving a signal from the crankshaft position sensor. The PCM uses the signal from the crankshaft position sensor to fire the coil/spark plugs. Check the wiring to the crankshaft position sensor and check the sensor itself.

did you check for voltage at the coil pack low tension input
this comes from the electronic ignition and the distributer dc setting on a multimeter

check inside the distributer that the little magnet is still in place on the rotor and that the sensor is outputing pulses as it turns over
{you can use a meter set to AC range for this ...}
pull a plug out and place its metal to ground check for actual sparks
if this is there then its fuel ...

Please check:
- If it is distributor type ignition system replace the distributor cap, rotor, ignition coil or ignition module from inside the distributor assembly. If it is distributor less ignition system then check the following items:
- Engine coolant temperature sensor.
- Fuse link in the engine bay fuse box.
- All the wires and connectors at the spark plugs.
- Crankshaft position sensor.
- Camshaft position sensor.
- Battery voltage at terminal #1,
- IGF signal (ignition confirmation signal) at terminal #2 with DSO.
- ( IGT) Ignition timing signal) at terminal #3 with DSO.
- Ground at terminal #4.
NOTE: Remove the connector from igniter #1 and see the female connector from the front side. The left most is the #1 and the right most is the #4 pin.

It will either be wires, cap or rotor. Or all three.

Are you getting power to the coil on the dark green wire with the orange stripe? The relay must have power to the coil and also to the contact. If yes, then problem might be with the crankshaft position sensor.

the crankshaft position sensor located between flywheel and trans is where the power source for the coil comes from. I suggest you need change that

Replace the crankshaft position sensor. It's located on the top of the transmission bellhousing on the drivers side.

install the new rotor, if that isn't it check the crankshaft position sensor.