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Posted on Oct 12, 2010

What could cause a 95 dodge avenger to only get spark out of two cylinders when all the plugs, wires, cap, and rotors are new

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  • Posted on Oct 12, 2010
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This could the the coil breaking down, or it could be a bad earth. The coil converts the 12v car battery voltage into a voltage capable of jumping across the gap of a spark plug, in excess of 12,000 volts.
This could be breaking down such that it is unable to provide the continuous voltage required. Are the two spark plugs always the same? If so, what happens if you move them to a position which doesn't spark.
Also, the spark plug will only work if there's a good ground between the plug and the engine block. Oil, dirt and possibly rust will effect the plugs ability to create a spark. Again if you move a 'good' plug to a position which doesn't spark, depending upon the outcome, will point you to the problem.

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Your misfire can be cause by couple of things but the cheapest way that you can try to fix your car is to do a tune up by replacing:
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I do not know how you have checked for spark, but lets start from the beginning.
Lets start with an ignition systems check.
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Note if you do not get spark from the coil wire replace the coil.

2. Ok if you have spark now we have find out if the spark is making it to the spark plugs. How are we going to do this? By checking the rotor, distributor cap, spark plug wires and spark plugs.First lets remove the distributor cap. This will allow use to inspected the rotor and the distributor cap. What your looking for is, cracks, carbon tracks and wear at the tip of the rotor. On the distributor ,look inside the cap for cracks, carbon tracks and wear on the terminals. If you find any of this replace the distributor cap and rotor. ( Note if you have any doubt of the condition of the rotor or the cap replace them.) Next lets check your spark plug wires. Lets pull off one of the spark plug wires from the spark plug side. Now inspect the wire connection for a white crusty powder. If you find crust replace your wires. Now you should check all of them the same way, but if even one has corrosion replace them all. You are going to have to inspect the wire its self . Going down the whole length of the wire. Holes cracks burn Marks and other damage. Once again if you find any damage replace them all.
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Troubleshoot your ignition by first assuring that you have fire.



If the engine does not crank at all pull the coil wire off at the cap and set it within an inch of the tower and crank the engine. sparks should emit from this wire to the coil.




You can test each individual spark plug wire this same way by just unplugging it and arcing the spark. then pull out the spark plugs to examine them and replace as necessary (on a dodge use champion plugs). the cap can be removed (make sure to put it on exactly as it came off and put each wire back exactly as it was or it will NOT fire correctly). to check for fuel disconnect the line at the fuel rail on top of the intake manifold and turn the key to ON. this will kick on the fuel pump and should push fuel out of the line as the pump primes. if this test works but you still are not getting fuel to a particular cylinder(s) start unplugging injectors while the engine is running and make a note of which one does not change the idle as this is your problem cylinder. remember any ignition or fuel system fault will disrupt your fuel/air ratio and can damage the catalytic convertor and o2 sensors
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