my buddy has a 90 jeep cherokee 4.0 he left home today got 4 blocks down the road and it died. this last summer we replaced the fuel filter plugs and wires, cap and rotor. we pulled fuel rail plugs to see if fuel was getting to engine and its getting gas, checked the ignition control modual ( failed in 2 ereas) and replaced it and checked the coil pack ( shows 6.36 on the ohm meter and new was 6.86). still wont start. we checked all wires and hoses all r connected. anybody got any ideas???

 

If you don't have spark:

AC voltage CPS test; Small clips on the meter leads really helps.

Unplug the connector at the back of the manifold with wires going down to the bell-housing/cps.
Probe the two wires to the cps with the meter set on AC volts. (a 200 scale on mine).
Crank the engine and note the voltage. (jump it if your battery is low)

Mine somehow works with only .3 my wiring/grounds must be pretty spiffy. .5 seems to be a good mark. One article talked of .5 to .8.

If it's low you can modify the cps. With the next largest bit that won't fit in the hole, enlarge the hole just a tad. Now when mounting it's crucial to maintain firm downward pressure on it while tightening the bolts. An assistant could help with that from above.