What is the main problem for p0300 on 02 Altima 2.5

20

Asked by Aug 09, 2015 at 02:45 AM about the 2002 Nissan Altima 2.5

Question type: Maintenance & Repair

I put new spark plugs in last month
change two out of four coil packs an
car is worst than before hesitate in
drive with foot on brake blinking
engine over a certain speed I need to
know what is the main problem

14 Answers

17,660

Have the catalytic converter checked

20

I changed the cat 2 months ago

20

Do you think it's the 02 sensors? Maybe

17,660

Usually when the check engine light is blinking that a sign of the catalytic converter so I would have the code read with a scanner to see exactly what the problem is.

20

Yea code came back as p0300 multiple misfire

1 out of 1 people think this is helpful.
245

Hi nice to meet you. The p0300 is a DTC for multiple missfire. You say you change the sparkplug and two coils, and check the catalitic converter. Ok. You need to verify the knock sensor, the cam sensor, the flow meter, and map sensor. You need to scan the car and take fuel pressure maybe you have poor fuel pressure.

1 out of 1 people think this is helpful.
20

Nice to meet you 2 I change cat but I didn't put new 02 sensors in you think that might be it

1 out of 1 people think this is helpful.
245

The o2 sensor or EGO sensor don't cause a PO300. If you have this kind of dtc the pcm is trying to say all cilinder are not firing good. You need to find the reason for all cilinder missfiring. The cat can do this problem but you are readi change. The other thing can do this is a bad knock sensor or a poor fuel pressure.

245

Verify you don't have a bad air leak in the multiple or air induction system. A broken air house etc.

20

Ok Ima check it out is there any thing I can do to fix till next week? Until I fix if

20

Can I try motor treatment?

245

Maybe. But you need to scan your car again. I think you have fuel pressure problem. You can fill the gas tank in a half with gasolin obvius and add an half of 1qt of transmission fluid IN THE FUEL TANK. The transmission fluid have cleanin properties and don't damage your fuel injectors and rise your fuel octane dont't damage. If don't help don't damage. Don't worry. But i still think you have fuel pressure problem or maybe with knok sensor, cam, or pcm. Thath wy you need to scan.

20

Ok thanks I been seeing stuff about seafoam

Check your firing order make sure you didn't wire it back up wrong after changing plugs have you looked at your dstributor cap and rotor button if not i would but for real dude it sounds like you put the wires on the plugs wronge after u changed the plugs and wires and if u used the old wires you may have riped the metal tab that connects the plug to the wire and they might be bad signal inside the boot change wires and make sure order is rite

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