- Joined
- Jul 19, 2025
- Messages
- 6
There was a thread about this here:
I was not sure whether to reply there or just start a new thread.
Anyway, my neighbors car is a 2008 Chevy Aveo5 1.6L with 120k on the clock. It has had a misfire off and on, but I was never able to really look at it because he drives it too much. But, in recent months, it has become worse. It seems to happen only uphill at low RPM, just like others have posted about. The code is misfire cylinder 2
I found the spark plugs 3 and 4 were covered in oil due to a valve cover gasket leak. I cleaned everything out and it was fine again, for a while. The problem returned eventually. I thought it was odd that it would say misfire on 2. I did not know at the time that 2 and 3 shared the same coil.
I pulled the plugs and boy they are worn out. You could drive a bus through the gap. The actual metal was worn along with the tip. I swapped 2 and 3 to see if that would make a difference. It was good again (for a while), and the problem returned. When it misfired, you could actually smell the oil burning. So finally, I fixed the valve cover gasket leak and now there is no more oil pouring into the spark plug area.
With all of that done, the problem remains. I thought *maybe* the constant oil on the plug wires had caused them to fail, so I put new wires, same issue. At this point, I pulled all of the plugs for inspection and found #3 to be cracked in the ceramic (a big one), which was originally on #2, but the code is still for #2.
I ordered new plugs and a coil pack. It needs new plugs anyway and I see that many people have had coil issues. Here is the odd part. I moved the cracked plug to #4, #2 to #1 and went for a test drive. Still #2 is the misfire.
So my question is, can half of the coil go bad? I assumed that a twin fire coil was sort of one piece. I have never seen part of it fail, unless there is some internal crack or something that would cause half of it to not work properly.
As another test while we wait for parts, I switched the #2 and #3 wire. I did not realize it is a wasted spark system and we could do that. Went for a test drive, works fine until the hill, then misfire. What I was hoping for was a #3 misfire, but no codes popped up.
I hope the coil is bad and that solves the problem. I just wanted some input or theories for reference that other people might look up.
Note: I went for iridium plugs. But from what people have said here they prefer copper or platinum for longevity.
I was not sure whether to reply there or just start a new thread.
Anyway, my neighbors car is a 2008 Chevy Aveo5 1.6L with 120k on the clock. It has had a misfire off and on, but I was never able to really look at it because he drives it too much. But, in recent months, it has become worse. It seems to happen only uphill at low RPM, just like others have posted about. The code is misfire cylinder 2
I found the spark plugs 3 and 4 were covered in oil due to a valve cover gasket leak. I cleaned everything out and it was fine again, for a while. The problem returned eventually. I thought it was odd that it would say misfire on 2. I did not know at the time that 2 and 3 shared the same coil.
I pulled the plugs and boy they are worn out. You could drive a bus through the gap. The actual metal was worn along with the tip. I swapped 2 and 3 to see if that would make a difference. It was good again (for a while), and the problem returned. When it misfired, you could actually smell the oil burning. So finally, I fixed the valve cover gasket leak and now there is no more oil pouring into the spark plug area.
With all of that done, the problem remains. I thought *maybe* the constant oil on the plug wires had caused them to fail, so I put new wires, same issue. At this point, I pulled all of the plugs for inspection and found #3 to be cracked in the ceramic (a big one), which was originally on #2, but the code is still for #2.
I ordered new plugs and a coil pack. It needs new plugs anyway and I see that many people have had coil issues. Here is the odd part. I moved the cracked plug to #4, #2 to #1 and went for a test drive. Still #2 is the misfire.
So my question is, can half of the coil go bad? I assumed that a twin fire coil was sort of one piece. I have never seen part of it fail, unless there is some internal crack or something that would cause half of it to not work properly.
As another test while we wait for parts, I switched the #2 and #3 wire. I did not realize it is a wasted spark system and we could do that. Went for a test drive, works fine until the hill, then misfire. What I was hoping for was a #3 misfire, but no codes popped up.
I hope the coil is bad and that solves the problem. I just wanted some input or theories for reference that other people might look up.
Note: I went for iridium plugs. But from what people have said here they prefer copper or platinum for longevity.
