Question about 1998 Chevrolet Lumina

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#1 cylinder misfire and exahust smells bad . could it be converter plugged and car is missing on highway and no power

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Hi Friend:

#1) Go ahead and Change your Plug Wires. Check your Timing and make sure its set right, now check the Coil that #1 Plug wire runs to, It could be you have a Bad coil. Each coil will have 2- Spark Plug wires that it gives you the Spark that goes to 2- of your Spark Plug Wies and to Spark Plug.

#2) If your timing is set Right and your Getting Fire from all your Coils to your Spark Plugs then you can rule them out.

#3) Then your Loss of Power and the smell you have is a Faulty or Plugged up Cataletic Covertor.

#4) Before replacing the Converttor ,Check to make sure that your Oxegen Sensors are good. ( A scan will tell you and Pin Point the various Emmission ,Electrical parts that are not Functioning properly.

#5) The convertor is very Expensive, So i'm going to give you a few more parts to check.

#6) Check your Air Filter make sure its not Dirty or Plugged up, Also check your PVC and The PVC line make sure the line is not Calasped.Check and make sure that your getting good Fuel Pressure. And check to make sure Fuel Filter is not Plugged or Restrited.

#7) When You Scan your Vehicle it will also give you codes that will eliminate some of the Problems i've Listed.

#8) And Last thing it could be is a Faulty Control Module.

Sir This will get your Vehicle running right and eliminate your problems.

Thank You for using Fixya Please let me know how my Solutions has helped you by Voting.

From: d_hubbs

Posted on Aug 27, 2010

  • nicholas_leg Aug 29, 2010

    hello everyone,the problem with my car was both rocker arms broke off for #1 cylinder. had to put heli coils in and reaired it again ,thanks for all the help

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Car is surging when going up hills and smell of eggs is present bad,what do you think the problem is?


Cylinder misfires-real bad ones,not random misfires

You have a Class A misfire- that is ruining the exhaust
converter,thus the sulphur dioxide smell,STOP Using it

You will need new spark plugs,find out what ignition coils
are bad & may have to replace the converters & oxygen sensors,
if you have used it like that a couple weeks

Your looking at $1000 repair bill or more, because you failed to
have it checked for codes,road tested with a scanner & look at
fuel trim & cylinder misfires

Jun 10, 2014 | 2004 Mitsubishi Endeavor

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I have a 2003 lincoln ls 3.9 v8 the code shows that I have a 8th cylinder miss and a bad o2 sensor can the o2 sensor make my car miss and it doesn't miss all the time either


A faulty o2 sensor will not cause a misfire. This is exhaust related, which is more than likely due to a clogged catalytic converter, which was is likely due to your misfire leaving unburned fuel to go to the exhaust, which clogs the catalyst. You likely smell a rotten egg type smell in the car at times. Your misfire is likely another cylinder. The OBDII codes are not great at finding the cylinder of the misfire in this particular car. Your best bet is to replace all 8 coils and plugs at the same time with OEM Motorcraft coils only. One bad coil makes the others work harder, meaning if you replace them one at a time, you will be constantly chasing a misfire.

Apr 12, 2014 | 2003 Lincoln LS

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Loss of power ,misfire, and strong smell of gas in 99 yukon 5.7


You'll need to pull the code from the computer to find what cylinder it is. It could be simple as replacing the spark plug (check it for damage) or the ignition coil. If the spark plug doesn't fix it, try moving the ignition coil to a different cylinder to see if the misfire follows that coil. If it does, replace the coil. If it does not, do a compression test as you may have dropped a valve or lost compression rings in that cylinder. Since there is raw fuel dumping into the exhaust there is the risk of fire from the catalytic converter.

Jan 27, 2014 | Cars & Trucks

2 Answers

Multiple misfire


Hi Jason:
A Random/Multiple Cylinder Misfire Detected unfortunately doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

A code Random/Multiple Cylinder Misfire Detected 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 this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 26, 2012 | 2001 Pontiac Grand Am SE

1 Answer

The car missfired. We put in new coil pack, new plugs, but car still miss fires. The exahuste pipe after cat. getting red hot. The car also smells as if its running rich and both fan motors are on. Check...


Replace the O2 Sensor and if that doesn't fix it your going to have to start replacing the stuff Identified by the codes. Most likely the Catalytic converter is bad and the Crank Position sensor. If the Crank Position sensor is sending faulty signals then it will cause misfires, the O2 sensor causes the motor to run rich, the Catalytic converter will become overheated if your running too rich or it is damaged or partially blocked.

Dec 29, 2010 | Saturn L-Series Cars & Trucks

1 Answer

1 plug miss fireing


You may be have troublecodes that will give you an indication of which cylinder is giving you the problem. P0300 indicates a misfire and if the 3rd digit is something other than 0, it tells you the cylinder. As an example, P0305 means the #5 cylinder is misfiring.

That being said, 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.

Oct 29, 2009 | 1997 Pontiac Trans Sport

2 Answers

What is code P0300 on a 2000 Chevy Malibu?


Basically this means that the 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. 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. 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.


Aug 31, 2009 | 2000 Chevrolet Malibu

2 Answers

2002 ford windstar showing obd2 codes po303,po304,po305 and idiling ruff and wont run over 45 mph and has low miles, how do i fix it ,thanks sincerely mark


might be the coil pack is bad, wires, plugs, o2 sensors, dirty injectors, catalic converter ( only if you smell rotten eggs ) . cylinders are misfireing.

Mar 23, 2009 | 2002 Ford Windstar Cargo

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