Question about 1997 Nissan Pathfinder

2 Answers

I HAVE A P0300 OBD CODE I DID A COMPRESSION TEST TO ENGINE AND IT PASS THE TEST,I DID CHECK EGR VALVE,CHANGE SPARK PLUGS,IGNITION WIRES, CAP AND ROTOR, I DID CHECK TPS SENSOR MAF SENSOR,FUEL PRESSURE,AND OXIGEN SENSORSI I FOUND THAT ON BANK 1 BOTH SENSORS (UP STREAM & DOWN STREAM )WORKS NORMALY BUT ON BANK 2 THE SENSOR 1 CHANGE FROM 0 TO 600 MILIVOLTS BUT NO CHANGES FROM RICH TO LEAN &SENSOR 2 HAS 0 MILIVOLTS & NO CHANGES FROM RICH TO LEAN SO I SWICHT SENSOR TO TEST THEM FROM BANK 2 TO BANK 1 AND THEY NO WORK SO I PUT A NEW OXIGEN SENSORS AND NOW A GOT MILIVOLTS ON SENSOR 2 BANK 2 BUT I STILL DON'T HAVE CHANGE FROM RICH TO LEAN.

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2 Answers

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  • Expert
  • 114 Answers

Distributor or coil pack, defective..if distributor , check your plug wires maybe one is in the wrong place, camshaft sensor or crankshaft sensor.

Posted on Apr 06, 2017

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  • Nissan Master
  • 44,391 Answers

P 0300 code is for random misfires
random misfires are more from dirty /faulty injectors or low fuel pressure than anything else
have a pressure test done to check pressure regulator , filter and pump operation
use a can of quality injector cleaner or remove and clean the injectors

Posted on Apr 06, 2017

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Posted on Jan 02, 2017

frcs68
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SOURCE: Distributor wont spark

check the fuseble link.
you can measure it, and make sure the contact are clean and secured.
the other thing is the check the ignition switch, make sure you have 12v going to the switch.
check thermo switch on top of the block.

Posted on May 21, 2009

  • 89 Answers

SOURCE: 1987 nissan 300zx failed emmissions too much co I

change oil and filter put a emission cleaner in fuel

Posted on Jul 11, 2009

SOURCE: i got a code that

You obviously do not know or care about your truck,
as far as OBD2 dash lights being on

When ever you get any diagnostic trouble fault codes
& thus the dash lights,your vehicle has problems

These lights have been on all vehicles for 31 years
Plenty of time to educate yourself

You get the code now & have somehow found out
possible causes,as you would if you went to a trouble chart

So you off to a good start,just a year late

I wouldn't even worry about the injectors,the gas filter is
taking care of them

You could put a pressure gauge on the system, to check
fuel pressure. Should do that every couple years anyway

Your O2 Sensors, the one or two closest to the engine,not the
rear monitors,get replaced every 100,000 miles

The MAF Sensor gets cleaned at least once a year

With a Lean Condition on only one Bank I would look for vacuum leaks
You may have to have the intake manifold smoke tested & check all
vacuum hoses & sources.

Don't rule out a misfire on cyl#1

As far as resolving anything,you didn't say if you have the
ability to do some of your own work
You obviously don't take it to a repair shop,at least not in a year !!

Posted on Jul 17, 2011

  • 2187 Answers

SOURCE: 2002 Nissan Xterra Supercharge 3.3L

Check the condition of the plugs you have installed. See if you can find one which has an irregular color. The spark plug should be dry and brown in color. The problem could be just in one or a few cylinders. More than one cylinder may mean a problem with the ignition coil. If it were just one we can isolate it into the components connected to the cylinder.

If you have the SES light on as well, it may be a bad O2 sensor or a bad catalytic converter. Check for the wiring that goes to the O2 sensor. The computer may not be getting the correct reading on how much fuel burned causing the misfire.

Posted on Jul 18, 2011

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4 Answers

I have a 1996 chevy Corsica with a code PO300.I have tried many repairs and still cannot repair this code


code p0300 refers to random/multiple cylinder/s ---misfire detected=== causes spark plug/s--HT lead/s--injector/s---ignition coil/s--low compression --wiring
Seeing as you have covered all the electrics, now concentrate on the injectors and fuel pressures
If you will do all injectors and the fuel pressure is where it is supposed to be ( pressure test) then you will have covered all bases
Low compression will be in the one cylinder only ans will remain in that cylinder regardless of injector or plug changes
I would leave that to the last resort as if it is random, it may be a loose valve seat insert that moves randomly causing a compression problem

May 24, 2015 | 1996 Chevrolet Corsica

1 Answer

P0300 code. Came up checked for spark troubles found nothing good spark good compression something is making the vehicle sound rough should I suspect a weak fuel pump anyone have a common fix


Borrowed from OBD Codes.com:
"Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

A
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
  • code P0300 may mean that one or more of the following has happened:
    • Faulty spark plugs or wires
    • Faulty coil (pack)
    • Faulty oxygen sensor(s)
    • Faulty fuel injector(s)
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Stuck/blocked/leaking EGR valve / passages
    • Faulty camshaft position sensor
    • Defective computer"

  • StarI suggest you start simple.... replace the plugs and test the spark plug wires. Make sure all connections are tight.
    Star

    Apr 02, 2015 | Cars & Trucks

    1 Answer

    What is code p0300?


    P0300 - Random, Multiple Cylinder Misfire Detected Fault Code Definition
    • Random, Multiple Misfire Detected
    Symptoms
    • Check Engine Light flashing
    • Rough running, hesitation, and/or jerking when accelerating
    • In some cases, there may be performance problems, such as dying at stop signs or rough idling, hesitation, misfires or lack of power (especially during acceleration), and a decrease in fuel economy
    Common Problems That Trigger theP0300
    • Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable)
    • Incorrect ignition timing
    • Vacuum leak(s)
    • Low or weak fuel pressure
    • Improperly functioning EGR system
    • Defective Mass Air Flow Sensor
    • Defective Crankshaft and/or Camshaft Sensor
    • Defective Throttle Position Sensor
    • Mechanical engine problems (i.e.-low compression, leaking head gasket(s), or valve problems

    Jul 25, 2014 | 2000 Dodge Durango

    2 Answers

    Why the loss of power and po300 code?


    HARD TO SAY WITH OUT BEING THERE BUT THIS MIGHT HELP .
    Crankshaft sensor Was the trouble with my 99 Chevy truck after replacing many components like coil cap rotor wires and so on .
    http://www.obd-codes.com/p0102 Code P0300 Causes and Fixes Code p0300 is a code that is generated when your engine has a misfire that is not related to only one cylinder. Sometimes this code will be set in addition to other codes such as p0301 which means that there is a misfire on cylinder 1 (cylinder 1 is the number one cylinder when looking at the firing order. It is generally the forward most cylinder on the engine.). If these engine codes are present as well the you should diagnose those first as they are probably causing code p0300.
    This code will set your check engine light and needs to be fixed as soon as possible. If it is not then you will probably need to replace your catalytic converter as well as the problem that is causing your misfire.
    There are many causes for this obd code. Since it is a "random misfire" or "multiple misfire" this means that the misfire is on different cylinders and not just one all the time.
    Common Causes
    • Low Fuel Pressure
    • Vacuum Leak
    • EGR system malfunction
    • Internal Engine Problems (such as low compression)
    Less Common Causes
    • Faulty Coil
    • Faulty Spark Plugs and/or Wires
    • Camshaft or Crankshaft sensors
    • Ignition module
    • Computer

    Jun 12, 2014 | 1998 Chevrolet Tahoe

    2 Answers

    98 silverado random misfire


    run a compression test to check for loose valve seat insert . no 1 cylinder
    other wise it is a fuel pressure problem and faulty injector/s

    Sep 26, 2017 | Cars & Trucks

    1 Answer

    When I have my Air Conditioner on my check engine light comes on. The engine studers. This doesn't happen right away. The OBD codes I get are P0300, P0303, P0304, P0305.


    Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
    A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring.


    A code P0300+ may mean that one or more of the following has happened:
    • Faulty spark plugs or wires
    • Faulty coil (pack)
    • Faulty oxygen sensor(s)
    • Faulty fuel injector(s)
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Stuck/blocked EGR valve / passages
    • Faulty camshaft position sensor
    • Defective computer
    • Running out of fuel
    • Poor compression

    If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

    If there are symptoms such as 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 wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

    Jun 02, 2011 | BMW 328 Cars & Trucks

    2 Answers

    I failed the emission test and I also went to get an check engine light test from Auto Zone. I received the codes P0300, P0301, P0302, P0303, P0304 and the results that I received from Auto Zone was valve...


    A code P0300 may mean that one or more of the following has happened:
    Faulty spark plugs or wires
    Faulty coil (pack)
    Faulty oxygen sensor(s)
    Faulty fuel injector(s)
    Burned exhaust valve
    Faulty catalytic converter(s)
    Stuck/blocked EGR valve / passages
    Faulty camshaft position sensor
    Defective computer

    Possible Solutions:
    If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

    If there are symptoms such as 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 wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases 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.

    Hope helps.

    Apr 19, 2011 | Lexus GS 400 Cars & Trucks

    1 Answer

    My 98 sonoma truck runs but lacks power with service engine soon light on .trouble code reads po300 cylinder misfire detected (random) what dose this mean


    See also: P0300 diagnostic code @ OBD-Codes.com
    Possible Causes:
    Fuel injectors, related wiring, sensors and computer issues
    Running out of gas, or poor fuel quality
    Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
    Incorrect Fuel Pressure
    EGR system concerns: leaking EGR valve or restricted ports
    Base engine concerns: low compression, valve train problems and timing issues
    Ignition system concerns including, but not limited to:
    Faulty spark plugs
    Faulty coil or related wiring
    Ignition module or related wiring issues
    Ignition related sensor faults or wiring issues

    Mar 13, 2011 | GMC Sonoma Cars & Trucks

    4 Answers

    2004 Acura MDX 3.5 130,000 miles multiple missfire how do i fix ?


    Hi, multiple cylinder misfire, is when the engine cylinders do not fire in the correct order, and do not do it constantly. There is no particular pattern to it. My experience with this condition is that it is usually caused by a faulty ignition coil that is beginning to burn out. It could also be bad wires pluds rotor or cap

    Causes Include.
    • Faulty spark plugs or wires
    • Faulty coil (pack)
    • Faulty oxygen sensor(s)
    • Faulty fuel injector(s)
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Stuck/blocked EGR valve / passages
    • Faulty camshaft position sensor
    • Defective computer

    Possible Solution:
    If there are symptoms such as 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 wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
    Random misfires that jump around from one cylinder to another. 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.

    Jan 11, 2011 | 2004 Acura MDX

    2 Answers

    Codes P0440 and P0300


    Hi,

    A quick Internet search on those codes pulled up the following info.
    http://www.obd-codes.com/p0440
    • Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
    • Inspect the EVAP system for cuts/holes in tubes/hoses
    • Inspect for damaged or disconnected hoses around the Evap purge solenoid
    • Check and/or replace the sensor
    • Check and/or replace the purge valve
    • Have a professional use a smoke machine to detect leaks
    http://www.obd-codes.com/p0300
    • Faulty spark plugs or wires
    • Faulty coil (pack)
    • Faulty oxygen sensor(s)
    • Faulty fuel injector(s)
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Stuck/blocked EGR valve / passages
    • Faulty camshaft position sensor
    • Defective computer

    Dec 12, 2008 | 1999 Chevrolet Cavalier

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