JEONLYEP
NAXJA Forum User
- Location
- N 37° 48.485 W 100° 20.903
My Jeep isn't starting. It cranks over but has no spark.
Some info. 91 XJ Sport 4.0 auto. 195K miles (73K I've owned it)
I put a CPS in thinking that was the trouble (NOT IT).
I tested the coil by info given by Runnin'On Empty.
Any one have a suggestion as to what to do (test) next?
Thanks
Daryl
Some info. 91 XJ Sport 4.0 auto. 195K miles (73K I've owned it)
I put a CPS in thinking that was the trouble (NOT IT).
I tested the coil by info given by Runnin'On Empty.
Chief93XJ suggested some other tests.Runnin'OnEmpty said:Daryl, to test the coil, connect an ohmmeter between the positive and negative terminals (the ones connected to the wiring harness). The resistance should be about .95 ohms to 1.2 ohms at room temperature. (mine tested 1.5)
Then connect the ohmmeter between the positive coil terminal and the high voltage tower (where the coil wire attaches). The resistance should be about 11K ohms to 15K ohms. (mine tested 13.35) Good luck.
Chief93XJ said:heres what you do. get a test light. Clip the lead on the negative side of battery turn key on check both wires on coil. one wire should have battery positive voltage with key on. Now switch the clip to the positive terminal and probe the other wire (the one that didn't have power) have a buddy crank the motor while you probe the other (non hot) wire. The test light should flash on and off. If you have both power and a pulsating ground (negative) the coil should spark. If you have both but no spark , bad coil. If you don't have a hot wire with the key on check your fuse (I don't have a hot wire, and the fuse lights the test light on both sides, so it is good) it will be labeled engine igition or something similar, it will probably be in the under-hood relay box.if you don't have a pulsating ground you probably need a crankshaft position sensor. Good luck bro, don't zap yourself- Aaron
Any one have a suggestion as to what to do (test) next?
Thanks
Daryl