Question about 1998 Chevrolet Lumina
#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.
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Posted on Aug 27, 2010
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Posted on Jan 02, 2017
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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.
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