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    Thread: POSSIBLE Engine Misfire. Tiny OR BIG Problem?

    1. #1
      What do you mean there's no turbo? FlaAveo5's Avatar
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      POSSIBLE Engine Misfire. Tiny OR BIG Problem?

      I looked over the other posts for 'POSSIBLE misfires', but I don't see my issue. So...I THINK my 2006 Aveo is misfiring on the morning cold star only. Never any other time. I have never had this problem with any other car in my life, so I cant compare it to anything. That damn 'check engine' light came on, 'flashing' a few days ago. Not steady,but flashing. So that means a misfire or Cat. problem...right

      I drove to work, a 10 min drive. I came back 4 hrs. later, it was still slightly warm, it started right up and ran fine all day. The light was gone, flashing or otherwise. Still gone now, 4 days later. Has not come on again, flashing or steady.
      The engine starts fine, revs up on the cold morning start, then calms down, we all know the cycle. BUT it runs rough for just the first 2-3 mins. the morning cold start only. Then it is smooth as glass, as usual. (Trying not to babble).

      So...what can I check on my own? I put in new Iridium plugs 6 months ago, took out the Bosch Platinums. Changed the oil on Jan 1st. like a good car owner. I use the same gas from the same station, and a tank-full takes about 3-4 weeks to get to empty. The 'flashing' check engine light is gone, the rough idle stops after 2-3 mins, the temp gauge is barely above stone cold, then it runs smooth. No smoke out the back, no leaks, everything else seems fine. I have a new ACC. belt on the engine, new head gasket, for a minor oil 'weaping' around the spark plug area, that gasket. That was 5 months ago. Don't know if any of that matters.

      So what else can I check or change, or clean on my own?? To see if it is anything else causing this issue. Before I try to find money to go to a mechanic. Is this 2 min. 'possible misfiring' damaging the engine? OR am I just wasting gas? I can live with that. No big deal to me!! Fla. has no inspection for tail pipe emissions..So if it is just wasting a few drops of gas, I don't care. BUT is it causing damage to the engine? Any ideas??? Thanks for any help.



    2. #2
      What do you mean there's no turbo?
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      Pull the plugs and see if there is any oil on them; valve cover gaskets going bad seem to be a problem with these cars
      2004 Aveo beater car
      2005 Aveo LT. 5-speed beater car (DOA)

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      FlaAveo5 (02-14-2020)

    4. #3
      What do you mean there's no turbo? FlaAveo5's Avatar
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      That is the gasket I mentioned that I had replaced months ago. The VERY minor leak it had is gone.
      Thank you for the idea, but that is long ago fixed, and I cleaned out the little bit of oil in the 1 spark plug chamber that had some. When I put in the new Iridium plugs.
      Last edited by FlaAveo5; 02-14-2020 at 01:01 AM.

    5. #4
      What do you mean there's no turbo?
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      Quote Originally Posted by FlaAveo5 View Post
      I looked over the other posts for 'POSSIBLE misfires', but I don't see my issue. So...I THINK my 2006 Aveo is misfiring on the morning cold star only. Never any other time. I have never had this problem with any other car in my life, so I cant compare it to anything. That damn 'check engine' light came on, 'flashing' a few days ago. Not steady,but flashing. So that means a misfire or Cat. problem...right

      I drove to work, a 10 min drive. I came back 4 hrs. later, it was still slightly warm, it started right up and ran fine all day. The light was gone, flashing or otherwise. Still gone now, 4 days later. Has not come on again, flashing or steady.
      The engine starts fine, revs up on the cold morning start, then calms down, we all know the cycle. BUT it runs rough for just the first 2-3 mins. the morning cold start only. Then it is smooth as glass, as usual. (Trying not to babble).

      So...what can I check on my own? I put in new Iridium plugs 6 months ago, took out the Bosch Platinums. Changed the oil on Jan 1st. like a good car owner. I use the same gas from the same station, and a tank-full takes about 3-4 weeks to get to empty. The 'flashing' check engine light is gone, the rough idle stops after 2-3 mins, the temp gauge is barely above stone cold, then it runs smooth. No smoke out the back, no leaks, everything else seems fine. I have a new ACC. belt on the engine, new head gasket, for a minor oil 'weaping' around the spark plug area, that gasket. That was 5 months ago. Don't know if any of that matters.

      So what else can I check or change, or clean on my own?? To see if it is anything else causing this issue. Before I try to find money to go to a mechanic. Is this 2 min. 'possible misfiring' damaging the engine? OR am I just wasting gas? I can live with that. No big deal to me!! Fla. has no inspection for tail pipe emissions..So if it is just wasting a few drops of gas, I don't care. BUT is it causing damage to the engine? Any ideas??? Thanks for any help.
      Just because you replaced something recently doesnt mean its actually working 100%. You might not visibly observe any leaks and/or smoke, but that doesnt mean its leaking internatlly and fouling your plugs. It takes less than 10min to pull the plugs, inspect, and reinstall.
      2004 Aveo beater car
      2005 Aveo LT. 5-speed beater car (DOA)

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      FlaAveo5 (02-14-2020)

    7. #5
      What do you mean there's no turbo? FlaAveo5's Avatar
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      i have all clean and fine.

    8. #6
      What's wrong with my car?
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      If it only runs rough on a cold start good basic things to do is to clean your throttle body and idle air control vlave, it may also help to have your injectors cleaned as they are getting older.





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      FlaAveo5 (Yesterday)

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