Question about 2000 Mazda MX-5 Miata

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Mazda Miata: Replaced the coil pack because of misfires, that fixed misfires. Now the check Engine light comes on and the code was related to Cat Convertor. The car get hot around the console and gear shift. There is exhaust coming from the tailpipe but I do not know if it is enough of a flow. Can the Cat convertor be partially stopped up and how can I check and be sure of what the problem is before I buy parts I do not need? Thanks, Danny

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The cat converter was trying to burn all of the excess fuel that was being sent out of the exhaust due to the misfire, got way to hot and melted the inside of the cat. I experimented with this while in tech school. You can burn up a cat in about 15 minutes at around 3000 rpm with a single cylinder misfire. I also work at a shop that specializes in miatas, and have seen this before. Get a new catalytic converter.

Posted on Jun 23, 2009

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IF YOU HAD MISFIRE PROBLEMS,IT PROBABLY DAMAGED CATALYTIC CONVERTER BY TOO MUCH UNBURNT FUEL ENTERING CONVERTER FROM THE MISFIRE CONDITION..IF YOUR SURE MISFIRE CONDITION IS CORRECTED,THEN YOU MUST REPLACE CONVERTER

Posted on Jun 22, 2009

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Why is Mazda Miata stumbling and missing after reaching closed loop?


Check compression. After spark and fuel, compression is next on older cars.

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I own a 1999 Jeep Cherokee Sport 4WD V6. About a month ago, I started getting my check engine light coming on from time to time. One day, when it was on, I stopped and had the code read. It returned code...


Hi kdeyette,
I hope our chat was informative. I am assuming, since you said your Jeep is equipped with a V-6 that it is a 4.7L. You can't swap plug wires because there are none, but you can swap coil packs from one cylinder to another to eliminate the coil pack as the cause of your misfire. As for the "solution" above that says to replace your catalytic converter, all I have to say is if you are not getting the "dreaded" code P0420 "Catalytic Converter Efficiency Below Threshold" - don't worry about the cat. - you MAY get this code once the misfire is fixed, but I wouldn't run out and lay down hundreds of dollars on a converter until the computer tells me it is time....and simply "resetting" codes doesn't fix ANYTHING!!! Just resetting codes and continuing to operate the vehicle with a misfire problem is a sure-fire way to guarantee that the catalyst will need to be replaced. Misfires destroy catalytic converters. Let's hope you get it fixed BEFORE this happens!

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I currently have a mazda rx8 231 2004. The engine management light came on and was told that the cat converter was gone due to misfiring spark plugs x 2 leading and x 2 trailing. these were all replaced...


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My mazda error codes P0300 and P0302 what does this mean!!!


man read this and u will know what is ur problem and how to fix it
P0300 Code - Random Misfire What does that mean? 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.
Symptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
CausesA 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 SolutionsIf 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.

P0302 Code - Cylinder #2 Misfire
What does that mean?
A P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #2
SymptomsSymptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
SymptomsSymptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
CausesA code P0302 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Possible SolutionsIf 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.

Jun 11, 2009 | 2004 Mazda RX-8

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Mar 03, 2009 | 2000 Mazda MX-5 Miata

1 Answer

Check engine light


did you ask the dealer if the car an an emissions recall for this problem

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