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4.9 misfire issues

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Old Dec 28, 2023 | 11:53 PM
  #11  
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Originally Posted by Funforandrew
good idea. I agree that it’s getting some bad signal after start up.
i have cleaned it, with the correct cleaner spray. Maybe I will replace it.
Don't guess. If that's the case, you should easily see that with a scan tool connected looking at live data.
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Old Jan 7, 2024 | 01:08 PM
  #12  
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I put a new mass airflow sensor in it. It did not make any change.
It’s still cold starts great and runs normal for about 30 seconds then it starts to either miss or it’s just a timing spike but the timing does spike and fluctuate as it’s idling. I can see it on my scan tool. If you drive it, it gets even worse, but it still runs. It just seems to miss
or stutter or spike worse.

so frustrating

help!

Last edited by Funforandrew; Jan 8, 2024 at 12:56 PM.
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Old Jan 8, 2024 | 04:43 AM
  #13  
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Originally Posted by Funforandrew
I put a new mass airflow sensor in it. It did not make any change.
It’s still cold starts great and runs normal for about 30 seconds then it starts to either miss or it’s just a Timex bike but the timing does spike and kind of Kleiman fluctuate as it’s idling. I can see it on my scan tool. If you drive it, it gets even worse, but it still runs. It just seems to mess or stutter or spike worse.

so frustrating

help!
There's over a hundred bucks down the drain. Did you actually observe its data from a cold start until the problem begins and see it change as the engine roughness began ?
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Old Jan 8, 2024 | 01:08 PM
  #14  
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Yes I can see it change
sorry for sloppy spelling, damn voice to text is junk
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Old Jan 8, 2024 | 01:14 PM
  #15  
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Idk what it cost, I had one on the shelf
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