2005 altima 2.5 L. code p0300

Asked by Feb 07, 2017 at 03:09 PM about the 2005 Nissan Altima 2.5 S

Question type: Maintenance & Repair

I have a 2002 nissan altima 2.5L was running
rough at about 1500 rpm and ch3ck engine light
was flashing pulled codes had code for p0303
for misfire cylinder 3 so replaced #3 ignition coil
code p0303 went away and turned into code
p0300 for multiple misfire so replaced all spark
plugs also replaced all coil boots and had to
replace valve cover for spark plug #1 tube seal
leaking car ran fine for 1 day and now code
p0300 is back any opinions on what to do next

1 Answer

76,235

P0300 NISSAN - Cylinder Misfire Detected Random Cylinders...Possible causes; Faulty spark plug (s), Faulty ignition coil (s), Clogged or faulty fuel injector (s), Intake air leak, Fuel injectors harness is open or shorted, Fuel Injectors circuit poor electrical connection, Ignition coils harness is open or shorted, Ignition coils circuit poor electrical connection, Insufficient cylinders compression, Incorrect fuel pressure....The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persist more tests needs to be done to diagnose problem.

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