6.0 map psi drops when high boost psi
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 14
From: Virginia Beach VA
The huge flutter sound when you let up fast is the turbo venting the pressure it built, called a turbo fart.... normal.
Baro should not move. EBP does go up when you stomp it, it should come down when you let up, amybe a little slow but should come down. P0401 is EGR low flow, if you deleted the EGR or it's unplugged or it could be plugged up and needs cleaned. If you have a delete, you'll need a tuner to clear the P0401 code.
Verify the MAP x-gauge is programmed correctly.
When turning the corner and you boot it, tires spin and then you let off the wheel kicks the other direction... yep, truck trying to get itself straight.
Baro should not move. EBP does go up when you stomp it, it should come down when you let up, amybe a little slow but should come down. P0401 is EGR low flow, if you deleted the EGR or it's unplugged or it could be plugged up and needs cleaned. If you have a delete, you'll need a tuner to clear the P0401 code.
Verify the MAP x-gauge is programmed correctly.
When turning the corner and you boot it, tires spin and then you let off the wheel kicks the other direction... yep, truck trying to get itself straight.
Thread Starter
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Junior User
Joined: Jun 2013
Posts: 54
Likes: 0
The huge flutter sound when you let up fast is the turbo venting the pressure it built, called a turbo fart.... normal. Baro should not move. EBP does go up when you stomp it, it should come down when you let up, amybe a little slow but should come down. P0401 is EGR low flow, if you deleted the EGR or it's unplugged or it could be plugged up and needs cleaned. If you have a delete, you'll need a tuner to clear the P0401 code. Verify the MAP x-gauge is programmed correctly. When turning the corner and you boot it, tires spin and then you let off the wheel kicks the other direction... yep, truck trying to get itself straight.
Elder User
Joined: Aug 2006
Posts: 642
Likes: 0
From: Olathe, KS
Do you have the EGR butterfly in the intake? If so it would cause the loss of boost at the intake and power will roll off. If so remove and things will be better. Most remove regardless of tuner just so it cannot close even if from air flow. Early had one, I believe 05 and up do not.
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Junior User
Joined: Jun 2013
Posts: 54
Likes: 0
Do you have the EGR butterfly in the intake? If so it would cause the loss of boost at the intake and power will roll off. If so remove and things will be better. Most remove regardless of tuner just so it cannot close even if from air flow. Early had one, I believe 05 and up do not.
Elder User
Joined: Aug 2006
Posts: 642
Likes: 0
From: Olathe, KS
Easy to do. There are two screws in the center of the butterfly plate. They are braded so will take a little work to screw out. Remove the housing from the truck easy to drop the screws in the intake. Once off it is pretty easy to figure out. Don't need to remove the shaft. Just the butterfly valve itself.
Posting Guru
Joined: Nov 2012
Posts: 2,123
Likes: 5
Same basic design as a carburater throttle plate, comes out the same way. Like he said leave the shaft in place.
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Junior User
Joined: Jun 2013
Posts: 54
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Okay so yeaterday or the day before I forgot witch all the days are mixing in together works been crazy but I tested the cac pipes and cac it self. But if I did it correctly witch I think I did no leaking from either the pipe or intercooler but I did notice a slight release of pressure from just under the turbo or possibly to the right of the turbo but no leaks from the intercooler so yay don't have to spend a grand on parts. And I did the flap removal and possibly the easiest mod I have ever done and did a big difference. So don't know where to go from here.
Lead Driver
Joined: Sep 2012
Posts: 7,844
Likes: 96
From: Manteca,Ca
Lead Driver
Joined: Sep 2012
Posts: 7,844
Likes: 96
From: Manteca,Ca
Thread Starter
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Junior User
Joined: Jun 2013
Posts: 54
Likes: 0
How can I test those spots without taking everything apart. And to be honest I don't think they could be cracked or leaking because I just replaced both manifolds and the smooth up pipe egr delete and y pipe the manifolds and y pipe are off a donner but they were pretty much brand new came off a 07 with 35000 miles (total truck there loss is my gain 
) how can I test it?
) how can I test it?
Lead Driver
Joined: Sep 2012
Posts: 7,844
Likes: 96
From: Manteca,Ca
some signs of leakage
1. smelling exhaust in the cab
2. loud
3. loss of power
4. soot on the firewall
5. rattling connection
A visual inspection would be necessary take a piece of paper towel or toilet paper and hold it up in that area and watch for blow by.
1. smelling exhaust in the cab
2. loud
3. loss of power
4. soot on the firewall
5. rattling connection
A visual inspection would be necessary take a piece of paper towel or toilet paper and hold it up in that area and watch for blow by.