No Power Issue
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Junior User
Joined: Jun 2011
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From: St. Martinville, La.
No Power Issue
2004 6.0L here. All stock except for MBRP turbo back exhaust (no muff, no cat). I am having a no/low power issue. Truck starts fine, idles fine, no smoke and no missing.
The problem is that I can't hardly get it over 60 mph on the highway. If I take off slow it seems to do fine, but if I try to accelerate quickly it falls on its face. I have an 04 so it has the loud turbo whistle. Turbo sounds fine and whistles normal at a low rpm , but if I try to accelerate quickly the whistle seems to go away and the exhaust gets louder. If I let off the throttle, the whistle comes back and the truck seems to pull a little harder. If I hold the brake and try to spool the turbo up the same thing happens. It falls on its face at about 1800 rpms and quits pulling. Any advice would be greatly appreciated!
The problem is that I can't hardly get it over 60 mph on the highway. If I take off slow it seems to do fine, but if I try to accelerate quickly it falls on its face. I have an 04 so it has the loud turbo whistle. Turbo sounds fine and whistles normal at a low rpm , but if I try to accelerate quickly the whistle seems to go away and the exhaust gets louder. If I let off the throttle, the whistle comes back and the truck seems to pull a little harder. If I hold the brake and try to spool the turbo up the same thing happens. It falls on its face at about 1800 rpms and quits pulling. Any advice would be greatly appreciated!
More Turbo
Joined: Jan 2011
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Are your boots good? Dont remember the name CAC boots maybe?. They are on the turbo pipes... I had one fail on vacation last year and it had 0 power! Hit a ford shop because I was on vacation lucky they had it and fixed it. It sounded similar to what you describe.
Daniel
Daniel
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Joined: Mar 2007
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From: Claremore, OK
Check your CAC boots, the one closest to the turbo takes a beating as far as oil & heat goes. Usually if you have one split, it's the one that will. It's also possible you've got stuck vanes in the turbo charger...you'd need to check for an underboost code to confirm that.
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Junior User
Joined: Jun 2011
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From: St. Martinville, La.
Thanks for info so far. I changed the CAC boot on the output side right at the turbo a few months back. It had a split in it. I could hear it leaking pretty loud from in the cab and there wasn't near this much loss in power at the time. I don't hear any leaks, but I will definitely check all of the boots. If I had stuck vanes would it still whistle normally at low RPM's then stop whisting when I try to spool it up then start whistling again when I let off? So low boost would would throw a code with no CEL? A slow to moderate acceleration feels normal but if I try to get more than about half throttle it really just falls on its face and the exhaust is louder than normal with no whistle at hard acceleration.
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Junior User
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From: St. Martinville, La.
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Hotshot
Joined: Apr 2010
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From: Saratoga Springs,UT
Well that does suck
so I see 2 options here get some gauges a SGII minimum or take it to the dealer
I mean check the CAC boots and also clean EBP sensor and tube and check MAP sensor and tube
so I see 2 options here get some gauges a SGII minimum or take it to the dealer
I mean check the CAC boots and also clean EBP sensor and tube and check MAP sensor and tube
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Junior User
Joined: Jun 2011
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From: St. Martinville, La.
Not familiar with the EBP?? sensor and tube. I found it in the 6.0L bible but the pic is not real clear. What can I use to clean these sensors and tube with that will not damage them?
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Junior User
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From: St. Martinville, La.
This may sound like a silly question, but here goes! Is the EBP (exhaust back pressure) sensor the same sensor that is referred to as the EP (exhaust pressure) sensor in the 6.0L Bible. And is it located right on the side of the dip stick stick tube kind of under the air filter? What can I use to clean this sensor and the MAP sensor with that will not harm them?
Hotshot
Joined: Dec 2003
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From: Stuttgart, Ar
Yes--EP = EBP. Just make sure the tube is clear between the sensor and the exhaust manifold. Carb cleaner or brake cleaner work great.
On an 03/04 it's mounted on the drivers front corner of the motor to one of the thermostat housing bolts. If you have an 03 motor (ICP under the turbo) it is not actually used by the PCM. It's an inferred value.
On an 03/04 it's mounted on the drivers front corner of the motor to one of the thermostat housing bolts. If you have an 03 motor (ICP under the turbo) it is not actually used by the PCM. It's an inferred value.
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From: St. Martinville, La.
I do have an 03 motor with the ICP under the turbo. When you say "it is not actually used by the PCM. It's an inferred value" what do you mean? Could it still be causing the issues that I am having? Does it still control the VGT vains somehow? Could I unplug it to see if the problem goes away?
Hotshot
Joined: Dec 2003
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From: Stuttgart, Ar
I do have an 03 motor with the ICP under the turbo. When you say "it is not actually used by the PCM. It's an inferred value" what do you mean? Could it still be causing the issues that I am having? Does it still control the VGT vains somehow? Could I unplug it to see if the problem goes away?
Hotshot
Joined: Dec 2003
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From: Stuttgart, Ar
If the truck has been dealership flashed anytime after July 2005 then yes, that's what I'm saying.