Question about 1996 Chevrolet Blazer

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Multiple mis-fires. I changed the plugs, coil box, throttle position sensor, egr valve, pcv valve, o2 sensor. i still get the multiple mis-fire code

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Have you checked the timeing belt also the bad gas does that to have your fuel filter checked

Posted on Sep 01, 2010

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Posted on Jan 02, 2017

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P0300


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 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

May 04, 2011 | Mitsubishi Eclipse Spyder Cars & Trucks

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Truck not firing properly front coil pack not firing at all.


if this truck has an o2 sensor i would replace that and also make sure the cat-converter is not plugged,this would give you your powerloss and egr code,next is your coil,this may be caused by the computer or your crank sensor,look at the tone ring that the crank sensor uses and make sure its not missing teeth or broken,also check all your fuses.

Jun 12, 2010 | 1994 Ford Ranger Supercab

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Code p0300 replaced coil spark plugs and coil cover 2000 2.4 cavalier rpm up and down while ideling


The code is a mis-fire code. This code does not tell you which cylinder is mis-firing.
Here is a list of other items to check :

- O2 sensor
- Catalytic converter
- EGR valve
- Cam sensor
- Bad computer

Please let me know what you find.

Feb 07, 2010 | 1996 Chevrolet Cavalier

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