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Re: 1990 jeep wrangler
Check the MAP sensor. To see if this is the problem, assuming that the Jeep won't start but is turning over, unplug the MAP sensor and then plug it back in. If you can start it now, the MAP sensor needs to be replaced. The MAP sensor is located in the engine compartment, where the firewall meets the body at the top of the engine compartment, on the driver's side.
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Could also be a fuse or relay problem. You'll need to find out if the coil has voltage and if the pick-up stator in the distributor is sending a signal to the computer. Might want to check the computer for trouble codes too.
Is the coil connected to the ditributor? did you knock any connections off in the process? Does it turn over but not fire? do you have spark at the plugs? Are you sure of cylinder location in respect to firing order? Did you-and check this first as with any elec. problems-blow a fuse in the ignition circuit? good luck!
You need 3 things for a start condition 1 spark 2 fuel 3 compression. If you have lost spark and have changed wires and coil then you should look at the crankshaft position sensor. This sensor tells the computer when to fire the coil and which plug to fire. Hope this helps. I will check back on the 14th.