Bad Engine problem 2.5s 03 Altima?

Question

im so tired of this vehicle its not even funny, the engine light is on at the moment still and I have replaced the spark plugs, I also took it to Autozone to get codes for the problem, its said code 302/ 2 missfires and it can either be Vacuum leak, high or low fuel pressure, ignition fault, spark plug, ignition coil, I dont have very much money at the time, and I have some what experience with this altima engine, im just trying to get all opinions cleared before I have to take it to the dealership, the vehicle was jumping today I added some fuel injector cleaner to the gas tank, and ever since Ive done that it started to jump but also today 9-14-06 I was driving the vehicle and it shut off on me but power was still running the egnine just died out, I really need some good opinions here. As soon as it died out I stopped the care put it in park and tried to turn it back on I added some gas while turning ignition and it came, this happen nearly 4 times today, thanks for your helpGODBLESS

Answer 1

A code P0302 indicates a misfire on cylinder number 2. From here you need to check all the external mechanical for that end of the engine. With it running, can you hear a vacuum leak when you get close to the intake area?
If not, you can rule that out for the time being.
Move to the plug wire. Inspect it closely. Do you see anything that appears burned or chalky around any portion of the wire? Spark plug clean, is the ceramic porcelain cracked, is there sign of "tracking" on the upper white class? Is the electrode in its proper position and is the lower insulator cracked or damaged? Look closely at the inner electrode. Is it solid, or does it move up and down? At this point, if all is in good condition, you may have a defective coil pack, or a failing injector.
Without some rather expensive equipment, you are reduced to "throwing parts" at the engine in hopes of "hitting" the failure. Pretty expensive way to go. Now you will have to take it to the shop.
You are not doomed to the dealer, however. Most REPUTABLE shops can help you out, but may not bee a whole lot less. They may be more willing to help you with cost, as the dealer may want to do a "complete" repair rather than just repairing the present condition.

Good Luck

Answer 2

in my experience with that trouble code it has always been the ignition coil or the ignition control module...plugs and wires never fixed that code..

both in which a lot of times can be tested at your local autozone on most vehicles.call and verify


good luck