ok heres what happened the other day i left work came back an at quittin time tried startin the jeep an nothing. so i hot it towed to the house an put it in the garage an checked to see if i had fuel first everything was ok fuel pump kicken on ect. so then i check to see if i had spark an nothing so i went an got a new ccs an tried that an still woildnt start. then i took it back an got a css an tried that an still nothing. so then i figured it had to be the coil or computer took a **** so i got a new coil an borrowed a computer an still nothing. ive tried checkin the wires the best i can an couldnt notice anything broke or nasty lookin an also it threw one code injector control circut 3,5,6 but that should have anything to do with spark right? any help will greatly be appreiacted its my dd an i need to try an resolve this asap

 

Sorry man, but I got no clue what a CSS or a CCS is!.. You've got an 01 right? You said no spark, have you checked the starter, alternator or coil packs? (I think the 01's have coil packs...)

 

sorry i was at work an the crank sensor an cam shaft sensor an ya i put a brand new coil on yesterday is there anything besides them 4 things that wont allow it to spark or start ?

 

How are you testing for spark?

 

Ok! Gotcha! Man it's too bad the CPS didn't fix it.. Maybe the NSS? Try seeing if it starts in neutral. Other than that, making sure all battery leads and grounds are clean and tight (obviously).. Maybe a bad starter relay? Dunno man, good luck!..

 

Could be the Automatic Shut Down (ASD) Relay. It's located in the Power Distribution Center (PDC). Location on the lid of the PDC. Try swaping the electric radiator fan relay with the ASD relay and see if it works.

 

ill try them few things when i get home an we used two screwdrivers an a ground to see if we could get an arc idk its really got me stumped right now

 

o an i put a test light on the coil plug an grounded off the batt an had some one turn the ignition an still nothing

 

What?

 

that was to cken idk how to explian that part really sorry

 

The coil design for the 00-01 is significantly different than that of the single coil and distributor setup on the earlier 4.0. You basically have three coils firing 6 plugs in the correct sequence, every crankshaft rotation (waste spark design). This is an engineering departure from the older, single spark every other crankshaft rotation.

You can test the coil pack like you would the old single coil design, but its more involved than physically accessing the spark plug end. Because of the design of the coil rail, don’t test the coil rail one spark plug port at a time. Testing one port at a time causes the remaining coil ports to be free floating (ie, not properly grounded through the spark plug). Free floating an encapsulated coil secondary causes significant increases in the voltage induced in the secondary. This increased voltage can easily exceed the dielectric breakdown of the coil secondary and could cause the coil windings to arc internally and break down the insulation. If this happens, it has the effect of reducing coil energy delivery potential in the best cases and in the worst cases, causes the coil to fail.

You need to install all 6 spark plugs to ensure you wont damage the coil rail. Because its difficult to guarantee that you can correctly ground all 6 plugs at once, you should make up 6 separate jumper wires about 2 feet long. Pull the rail and flip it upside down. Insert 6 spark plugs into the rail. Attach one end of a jumper wire to the threaded part of the spark plug with an large mouth alligator clip and attach the other end of the jumper wire to engine ground. Once all 6 are hooked up this way, you can then perform your engine cranking test while observing spark on all 6 plugs.

 

thanks ill try it hopefully tomorrow when i get a chance an does anyone knw if the timing has to do with spark say maby my timing chain broke idk ive just ran outta ideas im about to treat it like a gimp horse an shoot it lol