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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis SPONSORED BY:

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Old 02-22-2012, 09:27 AM
SMONTANA SMONTANA is offline
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2008 6.4L Turbo Problem

Long Story short I crashed my truck and just got it back $27,000 in damage. The replaced the whole frame and that means the cab had to come off. Currently for mods i have a K&N cold air intake, 5'' turbo back to a 6'' tip and a Spartan Tuner. Before i crashed i could easily get my turbo to 30psi without even trying and as soon as i let off the pedal you could hear the release of air the typical turbo whistle sound. Now when i go the truck back i cant get past 13-14psi of boost with my tuner turned on 250 tune. The intake is sucking air but the turbo is not running at the usual PSI. Also even when it does get to 14psi and i let off the pedal i dont get the release whistle sound that i did even when the truck was bone stock.

I have to ideas of what might be the problem. One is that since the 2008 Fords are "twin turbo" and electrically engaged if you will that the first stage turbo is working and the second one is not resulting in not geting the psi past 14. This could be due to a wire or sensor they did not hook up when they put my truck back together.

The second problem i could see is something to do with a wastgate issue not releasing the pressure or a house disconnected somewhere not allowing the truck to build up boost.

Please any ideas or places to look on my truck to see a problem.
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Old 02-22-2012, 09:49 AM
250ryansuperduty 250ryansuperduty is offline
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sother26
Maybe a boost leak?
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Old 02-22-2012, 10:47 AM
BroncoEx BroncoEx is offline
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Correct me if I'm wrong, but the 6.4 does NOT have TWIN turbos... it has dual turbos. Difference..... With twin, 1 turbo for each side 4 cyl of motor. Dual.... one is for slower speed 2nd for higher.
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Old 02-22-2012, 11:00 AM
SMONTANA SMONTANA is offline
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Yes you are correct it would be a dual turbo set up and that is why i have a feeling that the second stage if you will is not working and that is why i am not getting past the 13-14psi mark. On the other hand i also dont know why i cant hear the turbo release whistle.
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Old 02-22-2012, 11:15 AM
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Welcome to FTE SMONTANA.

I've moved your thread to the 6.4L Powerstroke Diesel forum for better assistance.

On another note, with $27k in damage on a 2008 truck, I'm amazed it didn't get totaled out, especially considering they had to replace the frame.
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Old 02-22-2012, 11:18 AM
SMONTANA SMONTANA is offline
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Thank you for the welcome! Yes i am too the told me that it was worth 41,000 and they would have to reach 75% of the trucks value before they would total it so i just made it.
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Old 02-22-2012, 11:25 AM
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Well I'm glad you've got your truck back now. These guys in the 6.4 forum are great and will help you out with your issues.
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Old 02-22-2012, 01:27 PM
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Not sure about the problem other then what your already suspecting.

But damn, I want to see pictures of what $27K damage looks like. Were you in it when it was wrecked? Wow.
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Old 02-22-2012, 01:41 PM
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The reason it was so much money is because they had to replace the frame with a brand new one. All new suspension in the front and all new front end panels and fenders, new radiators, new transmission lines that run right behind the bumper, two new tires a new rim and I have the factory 20" so they are not cheap, whole new bed including spray in bed liner and hard cover top. The card top cover was one of the new low profile ones with led lights that turn on when you lift it up that was 1000 by its self. Yes I was in the truck and the only reason I didnít flip the truck was because I hit a tree when I was sliding sideways and thatís why I had to get a new truck bed. fficeffice" />>>
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Old 02-22-2012, 02:13 PM
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Ouch, sounds like ALLOT of damage. Interesting how they said the truck was worth $41K by insurance. That's some good news.

Also curious, where did they get a frame from? Didn't think Ford would have any frames lying around for our model trucks with them having the new frames for the 11+ model trucks now.
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Old 02-22-2012, 02:22 PM
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Not sure where they got it from but it has all the Ford Stickers and barcodes on it with dates. I want to even say the date was just a few months old so i dont know if they make thems still so many a year or if the will still make them under order for isurance claims. I have no idea but i know its brand new because i saw the cost of it on the insurance claim!
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Old 02-22-2012, 02:35 PM
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For the turbo issue...first start by inspecting all the turbo inlet pipes and boots. Check all connections to see if tight.

start truck up and listen for leaks after you have put your hands on all connections.

You should still be under warranty so you might want to take it in. Most likey something is not hooked up correctly.

You have the spartan..have you run a diagnostics and checked for codes?
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Old 02-22-2012, 02:54 PM
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Yes I have the spartan and i have read the codes but everything is okay. The truck is still getting around 14psi and that is what i was getting when i was stock. Once i put the tune on i could easily hit 35psi. I understand that 14 psi is going to be better for the life of the turbo but the thing that i dont like is before the crash and them putting a new frame in i did hit 35psi and after i only hit 14psi. Thats why i think that maybe a connection for the "second stage" turbo was not working. The only problem is the 2008 Fords you can see anythin when you look everything is under something. I can argue with insurance that it was their fault when they worked on my truck and i know they will pay for all of it to be fixed i was just looking for a answer so i could go there and make the time i dont have my truck as short as possible. Also if i did take it to Ford i dont think i would be in warranty since my truck has 60,000 on it and i have the spartan tune or am i wrong about that?
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Old 02-22-2012, 03:09 PM
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I suspect the VGT for the turbo is not cycling to give you the boost under load. they (ford) can hook up to it and command the cycling of it.
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Old 02-24-2012, 09:13 PM
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Originally Posted by senix View Post
I suspect the VGT for the turbo is not cycling to give you the boost under load. they (ford) can hook up to it and command the cycling of it.

Hmmmmmm....

So THATS what I should try disconnecting to test my overboost / mileage conspiracy theory .....
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