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Check these three things in the misfiring cylinder: spark, gas, and compression. One of them is wrong or missing. For spark check the spark plug and wire. Make sure you have spark on the plug wire, a strong blue spark. For gas, the fuel/air mixture may be wrong. Does the fuel injector pulse, putting gas into the cylinder? Possibly you may have a leaking injector or a clogged injector.
If gas and spark seem okay, you need to check compression in the cylinder. Low compression will cause a misfire. If compression is 20 or 25% lower than adjacent cylinders, that could be causing a misfire. For example, say numbers 1 and 3 cylinders had about 150 psi compression. 80% of 150 = 120, so if cylinder 2 is 120psi or less, that could be setting the misfire code. Low compression can be caused by valves not seating well, or bad piston rings, bad head gasket- something in the combustion area of the cylinder is losing compression.
How long you been cranking it? You know every time you crank the engine over, the injectors are pulsing and spraying gas into the cylinders. If it was cranked a long time, you may have gas collected in the cylinders. Let it sit a bit so the gas dries out. If too much gas is getting into the cylinders, check your fuel pressure. If too high, the fuel pressure regulator may be bad.
If your spark is good and no injectors pulse then the stator has failed.The stator is in the distributor and is reponsible for injector pulse,you said you have spark and fuel pressure, and no injector the stator in the distributor is your solution,Now if the injector has no power thats totaly different, The power is fused
2.3 V-6? You should be a 2.5 V-6 whether you have a TBI (throttle body injector) or sequencial, If there is no injector pulse then move your inspection to the distributor, there you will see a distributor pick up, this controls spark and fuel, and yes the rule is if there is no spark then there is no fuel but you case is special you have spark and no fuel pulse,you will need to inspect this for corrosion as it can give spark and no fuel injector pulse,that is one area of no injector pulse, Then inspect the MAP sensor (your a spped density), the most common complaint for a map sensor is it start then dies. inspect this sensor its mounted on the firewall make sure the vacuum hose is connected, and that it is plugged in.
Check all the fuses,and check the fuel pump relay,if this checks out o k,See if there is fuel pressure at the fuel injectors,if there is,then the injectors are not pulsing.The cause of this is the pick up coil in the distributor,but replace the distributor as a whole,this has all the components in the distributor,That control the fire,and the pulse to the injectors,A used one might be more economical sound money wise.
The ECU requires timing pulses from the crankshaft and camshaft sensors in order to generate the injector pulses. All other sensors just modify the pulse width of the injectors to adjust for power and economy. If the ignition is entirely controlled from a distributor, the two above sensors would not affect the spark. Hope this helps!
Take a look and verify you have spark and are getting fuel; then if well check your compression. If no spark look at those components about the distributor and such. It is possible to have the timing (I am speaking of spark) 180 deg. off. It is easy to be fooled (been there done that) by seemingly having No.1 cylinder at TDC only to find it was 180 deg off. Rather then the top of the power stroke the piston may be at the top of the exhaust stroke. Check these items; it may be just that simple for you. If it is 180 off you need only to remove the distributor cap, unplug the electronics, remove the dist. and rotate the rotor 180. Please let me know how things go as I have great experience with this engine.
Is there an injector pulse going to the injector?(an electrical pulse to fire the injector). Is there spark at the plugs? If the pickup in the dist is faulty you won't have either one. If your vehicle uses a crank pickup with or instead of dist pick up....if it is defective ....no pulse. The above is 90% cause of no pulse....other is computer problem 10%. If you do have a injector pulse and no spray.....and have fuel pressure....change the injector. A quick check for spark is spray a little starting fluid in it.....if it starts on the fluid....spark is present.
the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up