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6th Gen ('00-'05): Cylinder 2 misfire detected

  #1  
Old 11-16-2018, 03:13 PM
George Joseph Wickens's Avatar
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Default Cylinder 2 misfire detected

The other day I was driving my car (2005 LT 3800 series 2 Naturally Aspirated) and noticed on 2 different occasions my car would randomly hesitate and the check engine light would flash on the dash. As soon as I slowed down the hesitating will stop and the check engine light would go away.

I Put 6 new spark plugs and wires in (mostly cause I was well over the change interval with the spark plugs but I also noticed one of my wires was falling apart)

After doing this the hesitating didnít go away but now I was able to replicate it. If I let the car gradually pick up speed it wonít hesitate, but if I punch it and go from 1000 rpms to 3000 rpms the hesitating will come back and the check engine light will start flashing . Once again if I slow down the check engine will go away

i was able to plug in my scan tool to see what it was, there was no stored codes but there was a pending code for a P0302 cylinder 2 misfire detected
 
  #2  
Old 11-17-2018, 09:17 AM
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Since you are being told which cylinder, here are somethings to check:
- Inspect the plug wire, ensure it's not damaged or loose on any of it's connections.
- Inspect the coil it connects with, ensure there is no damage the the tower/point it connects to.
- Pull the spark plug and look for signs of damage.
- Check for signs of vacuum leaks (if there is one, it's most likely at the fuel injector for that cylinder). A poor man's method to look for vac leaks, with the car running mist starting fluid around anywhere that has a vac connection or seal. If the idle changes at all, you are on to something.

If all that turns up fine, I would start with swapping the two plug wires on the coil they share (it will not change the firing order, but what you are looking for is if you continue to have a miss fire on the same cylinder OR does it change cylinders). If it changes cylinders, then there is most like something wrong with the coil. You can further test by swapping the coil with another coil on the car, again, looking to see if the problem is following a specific tower on a specific coil.

If it does not appear to be spark related, you may be dealing with an injector problem. You can prove this by swapping two of the injectors around and again, see if the problem follows the injector.
 
  #3  
Old 11-20-2018, 03:32 PM
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Turned out to be a bad coil. Thank you
 
  #4  
Old 11-20-2018, 08:46 PM
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Very welcome. Glad it turned out to be an easy fix
 
  #5  
Old 11-21-2018, 03:21 AM
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Originally Posted by The_Maniac View Post
Very welcome. Glad it turned out to be an easy fix
I bet that's what's wrong with mine, my car is sputtering. It will pick up speed if I press gently on the gas, lacks. Power if press hard,.. I'll let yall know if that was my problem also...
 
  #6  
Old 11-21-2018, 03:54 AM
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I forgot to mention, the code I got was P0300...anybody know that one?
 

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