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indy-tech, Import tech
Category: Nissan
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Experience:  Import technician
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QBR reader put "Misfire all cylinders Plugs, Injectors, Coils"

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QBR reader put "Misfire all cylinders Plugs, Injectors, Coils" we have changed coils and plugs plus put cleaner in injectors but are still getting misfire when accelerating.
Hi .
Still need assistance with this issue ??
What codes did you get just the one P0300 ,if any other please let me know.
Spark plugs ,all injectors, Coils, (New)
Any other test done .
Customer: replied 2 years ago.

the error code was P9*** "fault either injectors, coils, plugs" .

We have put new plugs, coils and cleaned injectors we do notice that it seems to happen more when on low fuel.

Hi Maurice .
See if you can get me the complete code so i can investigate this for you.
Customer: replied 2 years ago.

found out the code is P0300, which is generic to Nissan for they don't know. After much testing with on board obd2 scanners the garage has said one thing ECU unit faulty, but as one is worth more than the car i.

Hi Maurice .

What plugs do you have fitted ,if Bosch replace with NGK.

What Causes a P0300 Code?
  • 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

First do a fuel pressure test and if found good do a cylinder leak down test .

Then any vacuum leaks should be checked ,if st fuel trim is +10 and over manifold leak .

EGR system also a typical problem to cause a P0300 code .

Engine condition check that cylinder compression is above 8bars and all even .


The most common issue for this engine to set a P0300 code is the timing chain has slightly streached and will need replacing ,if on start up you hear a slight engine chain rattle then this is your problem .

Check the above and if needed please get back to me with the reply button, and not the poor or bad service, this way i can get back to you or suggest another expert if needed.

Your deposit does not pay me until the answer is rated in a positive way,
Not rating or a bad rating does not constitute a refund.

If you are not happy or you have sorted out your problem before the answer then please let me know with the reply button .

Kind regards Greg.

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