Question about 1996 Chevrolet Cavalier

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

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I have a 2002 Lesabre with the 3.8 engine so this may not apply but will share my experience as I just went through it this week. I had a random misfire code P0300. I replaced the plugs and wires with no change. This engine has three separate coil units. I bought one unit and tried it in all three spots. Again no change. Below the three coils is the Ignition Control Module. It cost about $140. Replaced it and the misfiring went away.

Posted on Mar 12, 2010

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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.

Posted on Feb 07, 2010

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2004 dodge dakota in limp mode wont go past 2000 rpm P2305 code comes on check engine light comes on can reset code but light stays on and wont go past 2000 rpm


Since you didn't say what engine you have, I am assuming it to be a 3.7 L. Code P2305 is set for insufficient ionization of the #2 coil. 1. Inspect the spark plugs for correct application, these should have NGK platinum spark plugs installed. Inspect the plugs for any signs of misfiring, such as carbon tracking on the spark plug insulator or the coil boot. Inspect for cracked spark plugs or incorrect gap. Inspect for any kind of fouling on the spark plugs. Replace the spark plugs or the coils as needed.

2. Verify the wiring is not shorted to ground from the coils to the Powertrain Control Module (PCM).

3. Keep in mind that anything that can affect the air fuel mixture can cause this code to set. Be SURE that there are NO vacuum leaks, the injector is not at fault, etc. Moving parts one at a time (spark plug; coil; injector) to "known good" cylinders is the best way to diagnose this trouble code.

Sep 20, 2014 | 2004 Dodge Dakota

2 Answers

What does code P0300 mean for a 2000 volvo engine


P0300 random misfire P0302 misfire cyl 2 P0304 misfire cyl 4.
Check spark plug and wires and coils

Feb 03, 2013 | 2000 Volvo S40

2 Answers

Got a p0300 and a p0316 code on my 03 navigator it is running rough and losing power


CODE PO300 - RANDOM MISFIRE DETECTED. POSSIBLE CAUSES ENGINE HAS A MECHANICAL FAULT.CLOGGED OR FAULTY FUEL INJECTORS.FUEL PRESSURE TOO LOW OR HIGH FUEL SUPPLY CONTAMINATED.EVAP CANISTER FUEL SOAKED.EGR VALVE IS STUCK OPEN OR THE PCV VALVE SYSTEM HAS A VACUUM LEAK.COULD HAVE FAULTY IGNITION COIL OR BAD SPARK PLUG. MAF SENSOR CONTAMINATED IT CAN CAUSE VERY LEAN FUEL CONDITIONS. CODE PO316 - MISFIRE IN THE FIRST 1000 REVOLUTIONS

Aug 29, 2011 | 2003 Lincoln Aviator

1 Answer

Have a cylinder 1 misfire on my 2000 cavalier z24 plugs are replaced and am goin to change the coil plug boots next will that help or no.


Was there oil in the spark plug hole? If so, you need to replace the valve cover gasket and possibly the coil pack.

Jan 29, 2011 | 2000 Chevrolet Cavalier

2 Answers

What does code p0300 mean for a 2004 chevrolet cavalier-car is sputtering and stalling when idiling


P0300 - Random/Multiple Cylinder Misfire Detected

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.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: 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.

Keep us updated and remember to rate this answer.

Jan 01, 2011 | 2004 Chevrolet Cavalier

1 Answer

P0300 Code 2001 Chevy Cavalier 2.4 twin cam


I would've started with the coil packs, modules, boots and plugs myself. They give many problems on the quad 4s?.

Jun 15, 2009 | 2004 Chevrolet Cavalier

2 Answers

MISSFIRE


try unplug the up streem O2 sensor drive the car for a while then check the code if its not p0300 change the O2 sensor

Apr 07, 2009 | 2000 Hyundai Accent

1 Answer

Code p0300


Basically this means that the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 OBD DTC 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

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 gettingpast the airflow sensor, or an EGR valve that is stuck open.

Mar 23, 2009 | 2000 Toyota Camry

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