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I wouldn't replace anything yet.  

 

from 0-16 psi the quadzilla is reading boost from the data sent out from the ecm.  If the quad shows 12 psi all the time then the ecm is seeing 12 psi all the time.  

 

More than likely it is a failing map sensor, but I would wait until it happens again and troubleshoot when you have the issue to make sure you narrow the issue.    

 

 

It is fairly common for the map to fail like this.  Most never reconize it as most tuners dont show you the issue.  

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I never really paid attention to it but some days the truck would feel lazy then other days it would be peppy! I'll wait till it does it again or gets worse. Guess oem is the best option to replace with right 

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3 minutes ago, Unreal Summit said:

I never really paid attention to it but some days the truck would feel lazy then other days it would be peppy! I'll wait till it does it again or gets worse. Guess oem is the best option to replace with right 

 

I would watch the live data. ECT, IAT and Engine Load. When the IAT falls below +80F then the ECM kicks in extra +4 degrees of timing roughly. Which might be too much timing for cold weather and high cetane fuels. Then when the IAT warm up above the +80F then the timing retards and the performance typically improves. This all can be seen with engine load and cruise control. 

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I wouldn't worrya about it.  timing spike due to cold weather is not something that happens iwth the quad only stock timing

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17 minutes ago, Unreal Summit said:

I'll put those up on my screen today so I can watch um. If that happens can it hurt my truck? That's alot of timing.

 

Doubtful seriously. ISB engines will take quite a bit of timing. The thing is by the time you get to the point of bucking you should have already noticed the engine load is higher because of negative torque. This is why I limit my MAX timing slider to 27 degrees because beyond that point bucking starts. VP44 is capable of 32 degrees of timing. As injectors get larger more timing is needed. I'm going to step up to 7 x 0.010 injectors since my current 7 x 0.0085 have nearly 100k miles already. I'm after efficiency but try to match Nick and get the same number he did.

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What you need to do is get into high gear and get up to 2k on the tach. Then read your timing. A good starting point is 19 to 20 degrees at 2k RPM on flat ground on cruise timing. 

 

You might read over my article on this.

 

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