Question about 2000 Chevrolet S-10

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Po300 bad misfire

I changed the wires, plugs, spider injection, and distributor is new. I am stumped and aggravated. Oh and it's not the egr either

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.This may be due to a vacuum leak, but it can also be caused by dirty fuel injectors, a weak fuel pump (low fuel pressure) or a faulty fuel pressure regulator.

Posted on Feb 28, 2009

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Bad distributer gear
replace entire distributer

Posted on Apr 18, 2009

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Posted on Jan 02, 2017

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1 Answer

On a 1999 g20 code p0300 can it be caused by a bad egr?


Po300 is code for random misfire. Could be spark plugs, spark plug wires. Continued driving with misfire can damage catlytic convertor.

Jan 26, 2015 | Cars & Trucks

1 Answer

What iRANDOM MISFIREs po300 mean


I'm not 100% sure but a misfire is when a cylinder isn't firing properly. If this is an automobile and fuel injected there can be different causes. These are just a few, bad injector on those cylinder, a bad coil if it has individual coils, bad valves inside the cylinder head, faulty spark plug wires, bad spark plugs, and many more.

Dec 13, 2014 | Cars & Trucks

1 Answer

4.3 vortec code po300


code p 0300 is random misfires and it is mainly from low fuel pressure
regardless of the make of car the pressure has to be no less than 45 -65psi
check the fuel pressure regulator
the next thing could be a problem ECM unit so substitute it with a known good one and see what happens

Mar 29, 2017 | GMC Jimmy Cars & Trucks

1 Answer

Truck had a very bad idle, code 300 multiple misfire, I changed the plugs, wires, distributor shaft, cap, cam pos sensor, crank sensor and the computer. Truck will start and idle fine for a few seconds...


What year is your truck? if it has a "vortex" engine in it then I would suspect the fuel injection system. The Vortex uses a spider web design with a central block and distribution liners that clip into the head. the tips are known to clog in the bores. Take the whole spider web off and spray the tips real good with carb cleaner and then clean the bores before you put it back together.

Aug 05, 2011 | Chevrolet 1500 Cars & Trucks

1 Answer

PO300 code. 3.4L 98 Chevy blazer. (random misfire). this happens at high speeds 16000 rpms and higher. after the engine is warm it is more noticeable and misses at idling speeds. if i take it higher than...


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. it could be any of the following 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
  • also
  • 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.

Jun 08, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

Po300 chevy silverodo sl 4.8 crew cab changed 4 coils tuned it up changed fuel filter clened fuel injecters change mapsencer thottle boddy that was no good changed preaser sceen on feul rail still comes up...


p0300 is a multible/random misfire, did you change the plug wires also !
  • 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

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

Feb 27, 2011 | 2003 Chevrolet Silverado 1500

3 Answers

My S-10 keeps giving a P0300 dtc. Can't figure out what is setting this code. Usually misfires at idle. Any suggestions?


if u change plug wires ,coils ,plugs and still having problems check the injecter with a pulse light the one that dont pulse the pcm is bad are broke wire if all of them are pulseing then change the injecter.had the same problem on a 2000 s10 2.2

Apr 27, 2010 | 2000 Chevrolet S-10

4 Answers

Po300 random mulitple misfire detected p1399 misfire any cylinder


If only one of your cylinders was misfiring, you probably would be getting a more specific code than P1399.
Also check the distributor rotor along with the cap and coils and wires (as mrgreenz suggests); the EGR valve to make sure it doesn't leak; your fuel pressure which can cause random misfires if the pressure is too low; and injectors if they are really dirty. If you have really high mileage, I probably would first just change out the plug wires with a new set, then reset the DTC and see if the code comes back.
Hope this is helpful as well.

Nov 27, 2009 | 2000 Honda Accord

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