Replaced plugs and coils sometimes the car has a hard start some days check engine light goes off then runs great for three or four days when it comes back on it says no 2 misfire or multiple misfire
SOURCE: Check Engine Light
Nita0605 you should have included a little more infomation. Does the car drive any different when the light is on? Most likely you have a trouble code P0325.........Knock sensor fault or O2 sensor problem. I wouldn't worry about it until the light stays on
SOURCE: 2003 Nissan Altima 2.5S, Check Engine Light Problem.
this problem could be caused by the mass air flow censor, i had the same problem with my car. it is really pricey at the dealer so you might want to check elsewhere for this part. I found one at a scrap yard for 85% less that the dealer and i also got life time warranty, the dealer does not offer any warranty on this part.
SOURCE: 2004 Sentra hard to start, engine code multiple cylinder failures
yes a fuel pump problem can and will cause both problems. not know the service history of this vech i will not say that there still might be other problems with your vech. but if you can get the pump replaced under warrenty i would do that first. and then procced. good luck kdc744
SOURCE: Check engine light
A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.
The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner.
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