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if you have 12v and a switching signal but the individual coil wont fire,
verify its the coil by switching it with another cylinder. if the problem follows the coil to the other cylinder you must buy one
on the straight six you will remove the bolt holding each coil to the valve cover. Remove one coil and use either a spark tester or a test light. If there is spark the coil is good. If there is no spark swap that coil with another. If the swapped coil fires than you know the circuit is good. If the coil that didn't fire still doesn't fire than you know the coil is bad.
If you are triing to find the bad coil simply run the truck and unplug each coil wire connection from each coil one at a time and change the one that dosn't change the way the engine is running.If you have coil over plug type ignition the firing order is controled by the computor and as long as you plug the coils in correctly no firing order is needed.
Your firing order is 1-3-4-2. There are 2 ignition coils under the cover sitting on top of the engine. One coil fires cylinders 1 and 4. The other fires cylinders 2 and 3.
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