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Magnum 5.9 idle surges and dies

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Old Mar 26, 2026 | 08:27 AM
  #21  
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Originally Posted by HeyYou
Can't see the video of your scanner that well.....
Here is a hopefully clearer video of a cold start this evening. Cold Start. The longer video is the first started, The shorter one is restarting it right after it died.
 
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Old Mar 26, 2026 | 09:04 AM
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Originally Posted by Palerider3
Here is a hopefully clearer video of a cold start this evening. Cold Start. The longer video is the first started, The shorter one is restarting it right after it died.
Can you rotate those? It is difficult for me to follow the way they are..... (old eyes, and all that. )
 
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Old Mar 26, 2026 | 09:28 AM
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Originally Posted by HeyYou
Can you rotate those? It is difficult for me to follow the way they are..... (old eyes, and all that. )
Cold start
 
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Old Mar 26, 2026 | 10:27 AM
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Originally Posted by Palerider3
That was just the vacuum gauge.

 
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Old Mar 26, 2026 | 12:34 PM
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Cold start

I think this worked better.
 
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Old Mar 26, 2026 | 01:53 PM
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Not seein' anything there to really point at and say "This is an issue."....... One thing I did notice though, it is shows rich, but, fuel trims are both zero?? That seems odd.
 
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Old Mar 26, 2026 | 03:42 PM
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Originally Posted by HeyYou
Not seein' anything there to really point at and say "This is an issue."....... One thing I did notice though, it is shows rich, but, fuel trims are both zero?? That seems odd.
It does seem odd right? It shows rich, smells rich and the plugs are black. So shouldn't short term trims be negative to try and correct that?
 
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Old Mar 26, 2026 | 05:01 PM
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Originally Posted by Palerider3
It does seem odd right? It shows rich, smells rich and the plugs are black. So shouldn't short term trims be negative to try and correct that?
One would think that.... Why they aren't is a mystery to me. Even if it were leaking injectors, the PCM should still be trying to compensate.....
 
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Old Mar 26, 2026 | 09:42 PM
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wouldn't it stay static being its operating in open loop?
 
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Old Mar 26, 2026 | 10:07 PM
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Originally Posted by dodgetruck2
wouldn't it stay static being its operating in open loop?
Yeah, you're probably right
 
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