Question about 2003 Chevrolet Cavalier

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Random multiple misfire code. Cat gets glowing red hot. Sluggish lack of power/acceleration

Ran just fine the night before. Had less than a 1/4 tank. Temp dropped to below zero. Went to start it the next morning n was running extremely rough. Sounded like it was missing n engine temp wouldn't heat up. Thought it was just extremely cold s let it run for almost 2 hours. No difference so shut it off. Next day same thing. Installed new AcDelco iridium plugs, gapped properly, checked the boots all fine. Ran a little better after installing new plugs. Same day took it to gas station filled the tank and added Iso-heat n stopped at Autozone to get the cel code read. Random multiple misfire. Noticed my cat was glowing red hot when I got home. Open to suggestions as to what the problem could be.

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  • Chevrolet Master
  • 21,873 Answers

Combining the hot cat converter and the missfire code, I would lean toward a fuel problem. Too lean or pressure too low.
If it was an ignition problem the cat would usually not be hot.
If the exhaust was stopped up, you would not usually get the multiple missfire issue. Just lack of power.
It could be a leaking EGR or other vac problem, and a dirty fuel filter too.

Posted on Jan 23, 2013

  • 2 more comments 
  • Shawn Jacques Jan 24, 2013

    I'm hopefully going to have more time to work on it this weekend. There is a major lack of power as of recent. Almost like it has gone into limp mode. Rpm's only go up to 3 - 3 n a half with the pedal to the floor.

  • Shawn Jacques Jan 24, 2013

    If its misfiring and there's too much gas collecting in the cat it'll get burned there and cause it to get hot.

  • Shawn Jacques Jan 25, 2013

    Cat is hollowed out. Cylinders 3 n 4 are not firing, no spark.

  • Shawn Jacques Feb 07, 2013

    Figured out the problem was either my coil pack assembly or the ignition control module. I bought the whole ignition/coil pack assembly from a junk yard, put it in n now it's running fine except.

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6ya6ya
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Posted on Jan 02, 2017

  • 356 Answers

SOURCE: rough idle, cruise control also stopped working

Sounds like you could have gotten some water in your fuel tank from that fill up. Go to a autoparts store and get a product to put in the tank that takes care of water in fuel. Use it when you fill the tank up a few times after and hopefully it goes away. Whenever you can't sustain power in the engine or it runs rough then your cruise control will constantly be shut off because the engine doesn't have the power to keep the speed up and should go away once your engine is running clean again.

Good Luck

Posted on Oct 09, 2009

wracefans24
  • 1985 Answers

SOURCE: engine temp gage spikes to 260 degree when

are you sure the cooling fans are working?
Is the coolant temp gauge telling the truth?
have you lifted the hood and heard the coolant bubbling into the overflow?
Or heard the tinging sound of a red hot engine?
If he did a liquid test with the dye,and it changed colors it should have changed very fast,
Another thing to think about if he was to take the fan belt off,and pull the thermostat housing off,and removed the thermostat,Now pour coolant into the thermostat hole to almost the top,Now start the car and see which side the bubbles come from,left or right,that will be the gasket that is leaking not both.

Posted on Jan 24, 2010

honeymokey
  • 3113 Answers

SOURCE: I have a 2003 silverado

Pull the vac hose going to fuel pressure regulator and see if it has fuel in it. If it does replace it. Just fixed one with multiple misfire codes.

Posted on Feb 05, 2011

  • 360 Answers

SOURCE: 2002 Chevy Trailblazer 6 cyl The catalytic

If you've gotten a tank of contaminated fuel, I'd check on the condition of the injectors first.

Posted on Feb 23, 2011

kennightinga
  • 2 Answers

SOURCE: Chevy Aveo surging

I had a corolla that did this to me, turned out to be an injector. Definitely worth looking towards that.

Posted on Aug 26, 2012

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P0300 - Random, Multiple Cylinder Misfire Detected Fault Code Definition
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