2006 s-type not firing on one side

Have you put leads on back on correctly are any damaged

Clogged cats can cause stalling and other issues.

New. Cats

A smog check/diagnostic at a reputable shop should reveal any catalytic converter problems. As far as random cylinder firing, there are several things which might present problems. I will list a few for you to consider: 1. Engines with higher mileage often have carbon deposits built up on the piston,valves, cylinder head,etc. When hot from running, these deposits can result in unexpected detonations of combustion chamber. 2. Condition of spark plug wires: old wires may "leak" meaning allowing current through the insulator. Also, sometimes wires run parallel to each other for a distance can create inductive firing out of order. 3. Spark plugs with deposits can cause detonation out of sequence. 4. Valve lash out of specification or worn cam can allow hot gases to detonate chambers. Sticky valves/guides may not be seating (closing) properly.

mean you replace front O2,codes mean back O2 sensor,spark plugs,fuel filter,could be battery[300].

Tune-up--spark plugs---waste of time and money

Cats-- won't last long with a misfire-that is why they failed


O2 Sensors--should have been changed when the cats were,
as they were over heated or over 100,000 miles

You still have coil misfires,you even said so

You replaced a cop coil based on a code

It doesn't work that way

P0300 Diagnostic Code - 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.


Hope helps, and keep us updated.

1-5-3-6-2-4 is the firing order.

right side is 1-3-5 left is 2-4-6

6 5
4 3
2 1

if your car give you i code thats says mutlipul misfire on number 1,2,3,or four cyl. that means that that cyl is not firing when its suppost to so if the code says number 3 cyl misfire or multipul misfire replace number 3 spark plug and coil pack and 80% of the time that will solve the problem.

P0300 Multiple/Random Misfire detected.
P0301 Misfire detected - Cyls. 1-4.
P0302 Misfire detected - Cyls. 1-4.