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2017 GMC 6.2 Whipple Supercharged Map sensor Problem

Tanner Smith

By Tanner Smith
in Engines & Drivetrain

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Tanner Smith Enthusiast

Tanner Smith

Posted
Posted

I have a 2017 GMC sierra with 6.2L and I just installed a whipple kit on it. Everything went great, no coolant leaks, its tuned by black bear performance. On whipple's instructions it says to use factory map sensor, well with my kit it came with a new LT4 map sensor in the manifold already. My truck is having a rough idle, erratic acceleration, and sometimes it doesn't want to start, until after I crank it a few times. I believe the stock map sensor is 1 bar? and the LT4 map sensor is 4 bar if I'm correct. Part Number for new map sensor that is in the truck is (12644807) if anyone could tell me more info on that map sensor. My tuner made the tune for the stock map sensor, could that be why the truck is running poorly? The map sensor not tuned correctly so its telling the ECM false readings? Thanks

flyingfool Senior Enthusiast

flyingfool

Posted
Posted

i could be wrong but you need to use the LT4 sensor, then in the software update the OS on the truck for it. if its tuned for the 1 bar you wont run.

Tanner Smith Enthusiast

Tanner Smith

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26 minutes ago, flyingfool said:

i could be wrong but you need to use the LT4 sensor, then in the software update the OS on the truck for it. if its tuned for the 1 bar you wont run.

okay that what i was thinking if it was tuned for the 1 bar, it wont run correct if it has the LT4 map in it. Thanks

Tanner Smith Enthusiast

Tanner Smith

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2 hours ago, flyingfool said:

your mixing incorrect parts with incorrect software calibration.  tow the truck to a tuner shop

yeah i emailed my tuner black bear performance to update tune for the LT4 map sensor.

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Or you could just stick the stock map sensor in the intake and it would run.

 

Not like your tuner even bothered to tune the MAP portion of the tune anyway, nobody does. They just MAF tune it and send it on it's way because that's the easy way without a dyno and tons and tons hours to burn on a dyno.

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Tanner Smith Enthusiast

Tanner Smith

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31 minutes ago, CamGTP said:

Or you could just stick the stock map sensor in the intake and it would run.

 

Not like your tuner even bothered to tune the MAP portion of the tune anyway, nobody does. They just MAF tune it and send it on it's way because that's the easy way without a dyno and tons and tons hours to burn on a dyno.

well the problem is that the stock map has a different pig tail than the LT4 so I can't plug it in. My tuner should be able to tune for the different map sensor.

flyingfool Senior Enthusiast

flyingfool

Posted
Posted
3 hours ago, Tanner Smith said:

well the problem is that the stock map has a different pig tail than the LT4 so I can't plug it in. My tuner should be able to tune for the different map sensor.

ahh i seen this issue on a youtubers video, look up preston moore on YT, he talks about your issue and has it fixed correctly on his setup.  email him on his website too . but the video shows how to do it.

  • 10 months later...
jay44811 Enthusiast

jay44811

Posted
Posted
On 2/1/2021 at 1:59 AM, flyingfool said:

ahh i seen this issue on a youtubers video, look up preston moore on YT, he talks about your issue and has it fixed correctly on his setup.  email him on his website too . but the video shows how to do it.

flying,

i am about to do this upgrade and am having the issue of using the 4 mapt that came in the blower to the 3 pin stock sensor harness. i looked for preston moore on youtube and came up blank.can you steerme in alittle closer?

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