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Start the engine and let it idle.Pull off the spark plug wires one at a time(wear leather gloves or use a plug wire tool to avoid being shocked).The wire that you pull off that makes no difference to the way the truck runs is the problem.If a set of plugs and wires don,t fix the problem,remove the suspect plug and check to see if it is firing by laying the metal portion against a good ground and then have someone turn over the engine while you watch for spark,if you have spark then you likely have a plugged catalytic converter,if there is no spark then you need a coil pack.
if you have a bad spark plug wire, it will draw condensation and make engine run rough.... you can check this by getting a spray bottle and filling it with water, spray a mist over top of the wires while the car is running, and if one is bad it will show.... (looks like little lightning coming off of wire) .... hope this helps
If you have spark at the coil then you have a good coil. You can't measure Ohm at a spark plug since it is alway open at the gap. But you can OHM measure a spark plug wire at both end. If you have nothing mean your wire is bad. You can swap one more wire to confirm a bad wire. If your wire is not bad then I recommend to replace both rotor and distributor cap. Good luck in locating the problem.
What are you wondering is correct.
Let check the coil first. if coil is good the there is a problem with the ignition module. If the ignition module is good then a problem with the crankshaft sensor.
The coil can be checked by measure resistance of the terminals of the primary coil and secondary coil separately to see if it open.
To check if it can generate a spark, once you identify the primary coil terminal, run 12 V wire to these terminal, connect a spark plug to the secondary coil, by just leaving a spark plug with connected with spark plug wire and let it touch the engine chassis. Now you have to make pulses at the 12 volts connection by making a break and connection several time to turn it on and off to generate the spark at spark plug. The ignition module is supposed to do what you are doing now to generate the spark. If it is bad, it can't do what you did then a spark is not generated.
For the crankshaft sensor, only the shop can tell you it is bad or not. Good luck.
Yes these optispark systems had all sorts of problems in wet weather most of the time you could replace the cap portion and that would solve it but most of the time I would replace the whole thing including new plug wires, coil wire,and spark plugs .Due to the fact that you have to remove water pump to access opti spark
Just remove an ignition coil that you know is good, with a good spark plug and hook up to the wire were the bad one was. Have someone start your truck up for you and if the spark plug fires then the ignition coil that you took off was bad. But before you do that just try a new spark plug that may be the problem.