I am having a misfire on #4 cylinder. I changed all the plugs and wires last year but I could not get to the passenger rear wire (#4) so i just changed the plug and not the wire on this cylinder. I now have a misfire on #4 so I am assuming it is the wire. Any tips on the best way to get this wire unclamped and removed? I am having a hard time getting anything down to the wire clamp to release it. Thanks.
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A P0302 is indicating that cylinder # 2 is misfiring...Cylinder # 2 is the second plug counting from the front to rear of engine...Main causes for misfire are: defective spark plug, spark plug wire...When was last time plugs were changed? if it has been awhile I would suggest changing them...Also the spark plug wires should be replaced...Changing one plug and/or one wire isn't a good idea; change them all...Plugs cost two or three dollars apiece and a set of wires around $15...Standard motor products wire set # 4717...Spark plugs; Bosch platinum gaped at .044
Standing on the passenger side.looking at the engine. Number 1 is the first cylinder on your left. Follow the wire to the coil. unplug it at the coil, lay the end of the plug close to the tip of the cap and start the engine. If there isn't multiple sparks, replace the coil. If there is , replace the plug and or wire. If you still have a misfire after that, do a compression test on number 1 cylinder.
Gas or compression. Check the injector circuit on 1 and 3. Are they pulsing, to put gas in the cylinders? Do a compression test to rule out loss of compression as cause for the misfire.
Kind of odd it would be 1 and 3, but that is one right after the other in the firing order of 1-3-4-2...so, you have a single coil? So you have a distributor-examine closely the distributor cap and rotor if those were not changed too, with the plugs and wires. Look for damage, little black tracks that indicate shorting of the spark, maybe damage at the electrode tips on the inside of cap on 1 and 3 plug wire towers. Most people change the cap and rotor when doing the plugs and plug wires.
Just a possibility also, that the injector ground wires for 1 and 3 might share the same ground. That is to say, they might splice together before going to the computer where the computer internally grounds injector circuits to cause pulsing. Well, those are my thoughts, good luck. And let me know what you find, always interested.
yes start with your plugs and then the wires to see if it is the wire pull the cylinder 4 wire off and swap with another plug if it changes to another cylinder misfire then you know its the plug wire. hope this helps and good luck let me know if ya need more..
-Last number corresponds to which cylinder is misfiring.
Could be a faulty spark plug or wire. Try changing the spark plug from the 4 Cylinder to another and see what happens; If the different cylinder misfires, then it is the spark plug. If not, it could be the wires on cylinder 4.
not only did the problem switch cylinders, it switched banks. cylinders 5&6 are on the drivers side and 4 is on the passenger side. i would recheck all wires to make sure you have the correctly installed.
The third cylinder is the third spark plug wire from the passenger side of the car. An easy way to tell if this is the cylinder that is misfiring is to pull up the spark plug wire using insulated pliers with the car running. If there is no change in idle speed then that's the dead cylinder. If when you pull out the spark plug wire you see sparks shooting all over from it (a very common problem) then you need a tune-up.