Boost problem *** UPDATE ***
Thread Starter
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Elder User
Joined: May 2010
Posts: 691
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From: Ohio
No on the coolant. Had EBP sensor problem last summer and cleaned tube out and replaced EBP. Cleaned tube when turbo was replaced. EBP cleaned 2 days ago. No change.
Posting Guru
Joined: Mar 2014
Posts: 1,468
Likes: 5
From: Salt Lake City, utah
When you pressure tested the intercooler was it in the truck or did you remove it? Have you pressure tested the entire system with air and soap including the intake manifold gaskets? Make a boost leak fitting out of a PVC cap and a regulator you can install at the inlet to the turbo and pressure the system as one unit. If no leaks my guess would be a sensor. Even the smallest leak can cause issues.
Thread Starter
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Elder User
Joined: May 2010
Posts: 691
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From: Ohio
When you pressure tested the intercooler was it in the truck or did you remove it? Have you pressure tested the entire system with air and soap including the intake manifold gaskets? Make a boost leak fitting out of a PVC cap and a regulator you can install at the inlet to the turbo and pressure the system as one unit. If no leaks my guess would be a sensor. Even the smallest leak can cause issues.
Posting Guru
Joined: Mar 2014
Posts: 1,468
Likes: 5
From: Salt Lake City, utah
Ok last question. Are you having Drive ability problems or are you looking at the numbers and thinking there is something wrong? The boost numbers will jump and fall depending on conditions, TPS position, grade no grade etc. I will follow along now and hopefully learn something this is definitely an odd situation.
Thread Starter
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Elder User
Joined: May 2010
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From: Ohio
Ok last question. Are you having Drive ability problems or are you looking at the numbers and thinking there is something wrong? The boost numbers will jump and fall depending on conditions, TPS position, grade no grade etc. I will follow along now and hopefully learn something this is definitely an odd situation.
Senior User
Joined: Jan 2017
Posts: 428
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From: Central Illinois
Excellent! Glad ya got her fixed! Hopefully injectors didn't starve too much. Fuel pressure guage install will be #1 priority as far as guages go once I tear into it. Dang injectors are too expensive to not monitor fp.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
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Elder User
Joined: May 2010
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From: Ohio
Full throttle no load it will hit 29psi. All of the drivability problems gone. Drive just like it did before all the problems started. Thank for your help.
Lead Driver
Joined: May 2014
Posts: 6,545
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From: Virginia Beach VA
I'm a need to know why kind of person. The blue spring is designed to ensure the pressure doesn't go below 45psi during WOT. The truck can't really see the actual pressure the pump is making. So I'd assume it was just running out of fuel as it does also help it make boost. Unlike a gasser, you need fuel and air to reach peak efficiency and it won't run lean, just run out... hope that makes sense. It never dawned on me to check that.
I have seen and read of others here saying that the blue spring was worn out and the truck didn't stay above 45psi at WOT. If possible and not much effort, I'd throw a gauge on her to verify you are above that number. Harbor Freight sells an oil pressure test kit for $30, has all the fittings included, #62621. Might be a good investment.
I have seen and read of others here saying that the blue spring was worn out and the truck didn't stay above 45psi at WOT. If possible and not much effort, I'd throw a gauge on her to verify you are above that number. Harbor Freight sells an oil pressure test kit for $30, has all the fittings included, #62621. Might be a good investment.
Thread Starter
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Elder User
Joined: May 2010
Posts: 691
Likes: 0
From: Ohio
I'm a need to know why kind of person. The blue spring is designed to ensure the pressure doesn't go below 45psi during WOT. The truck can't really see the actual pressure the pump is making. So I'd assume it was just running out of fuel as it does also help it make boost. Unlike a gasser, you need fuel and air to reach peak efficiency and it won't run lean, just run out... hope that makes sense. It never dawned on me to check that.
I have seen and read of others here saying that the blue spring was worn out and the truck didn't stay above 45psi at WOT. If possible and not much effort, I'd throw a gauge on her to verify you are above that number. Harbor Freight sells an oil pressure test kit for $30, has all the fittings included, #62621. Might be a good investment.
I have seen and read of others here saying that the blue spring was worn out and the truck didn't stay above 45psi at WOT. If possible and not much effort, I'd throw a gauge on her to verify you are above that number. Harbor Freight sells an oil pressure test kit for $30, has all the fittings included, #62621. Might be a good investment.
Thread Starter
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Elder User
Joined: May 2010
Posts: 691
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From: Ohio
I was just glad that someone else understood what I was talking about. The tech said when he drove it it felt like the rear brakes were holding the truck back but only when you tried to accelerate. He said he has only seen two trucks have this problem. The first one was about a month ago. So when he seen the data and then drove it he knew exactly where to look.
