Power loss while towing
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Turbocharger/Supercharger "A" Overboost Condition (Diesel specific)
bismic is 'da man. Maybe he'll come back soon and tell us what he was thinking when he asked about overboost.
Dang!that was quick!
bismic is 'da man. Maybe he'll come back soon and tell us what he was thinking when he asked about overboost.
Dang!that was quick!
Last edited by Rusty Axlerod; May 11, 2011 at 06:35 PM. Reason: got beat to the post
Senior User
Joined: Apr 2010
Posts: 151
Likes: 0
From: Suffolk, VA
That is what I want to know. What happens an over boost is sensed?
Thread Starter
|
More Turbo
Joined: Apr 2011
Posts: 627
Likes: 1
From: Western Connecticut
I purposely was scanning the dashboard gauges right before I lost power. 20lb of boost, that was it! From other threads on this forum i should be constantly pull 26-30 lbs given those towing conditions. I had the skinny pedal to the floor @ 3500rpm, 70mph and gaining when it went into limp-home mode. can you overboost at 20lbs, or is it possibly the MAP Sensor on it's way out?
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Instant "limp home" mode.
Maybe your boost gauge is not reading correctly rattleNsmoke?
Maybe your boost gauge is not reading correctly rattleNsmoke?
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Kinda weird to quote myself but....there's a problem here. I was rooting around it the Tech Folder and read that the alarm is set for 28 psi boost stock and 30psi with a tuner, and engine is defueled at 28.6 psi. so if I'm seeing 35 psi something is wrong somewhere. I'm sure I've seen daylight between the left side of the needle and the 30 psi mark on the gauge face on a few occasions. Maybe I'm looking at it wrong and that hashmark between 20 and 40 isn't dead in the middle. Hmmm..
Fleet Owner
Joined: Nov 2003
Posts: 27,900
Likes: 3,617
The two most common issues to cause de-fueling when working the engine hard are EOT/ECT split and overboost.
You got an overboost code.
Personally, I would be looking into the turbo system for the issue. MAP sensor hose might be plugged or the sensor could be bad, but I don't think the code is for EITHER an underboost or an overboost (ie only overboost).
So ..... you might not see the boost on the gauge for whatever reason. Could be that the MAP saw a high boost that was not as rapidly transmitted to the gauge - who knows. Maybe the ebp saw a high reading (IIRC the code can be thrown due to an EBP value also - but not 100% sure).
Most likely, your turbo vanes are sticking - at least IMO. I would also check the ebp sensor tube for plugging, and I would get a way to verify that MAP, BARO, and EBP all read the same at KOEO.
You got an overboost code.
Personally, I would be looking into the turbo system for the issue. MAP sensor hose might be plugged or the sensor could be bad, but I don't think the code is for EITHER an underboost or an overboost (ie only overboost).
So ..... you might not see the boost on the gauge for whatever reason. Could be that the MAP saw a high boost that was not as rapidly transmitted to the gauge - who knows. Maybe the ebp saw a high reading (IIRC the code can be thrown due to an EBP value also - but not 100% sure).
Most likely, your turbo vanes are sticking - at least IMO. I would also check the ebp sensor tube for plugging, and I would get a way to verify that MAP, BARO, and EBP all read the same at KOEO.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
FTE Leadership Emeritus
Joined: Jan 2003
Posts: 161,999
Likes: 75
From: 3rd Rock
How many miles on it
How many times reflashed
How many times reflashed
FTE Leadership Emeritus
Joined: Aug 2007
Posts: 42,085
Likes: 6
From: Lakewood, Ca.
MAP sensor is mounted on the passenger's side, off of the engine near the AC receiver/drier. There's a hose that runs to it from the intake manifold.
Thread Starter
|
More Turbo
Joined: Apr 2011
Posts: 627
Likes: 1
From: Western Connecticut
Thanks guys, I found it. I unplugged the hose from the nipple and it was partially clogged. I reamed it out good.
Tim, the truck has 84k on it and no idea how many times she was re-flashed. The dealer wants $100 to hook it up and re-flash. From what I've been reading, the latest flash has wreaked havoc on the exhaust temp reading spread before and after the EGR cooler. Is getting the latest and greatest re-flash a good idea?
Tim, the truck has 84k on it and no idea how many times she was re-flashed. The dealer wants $100 to hook it up and re-flash. From what I've been reading, the latest flash has wreaked havoc on the exhaust temp reading spread before and after the EGR cooler. Is getting the latest and greatest re-flash a good idea?
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
There's NOTHING that monitors exhaust temperatures on a 6.0 diesel from the factory. The newest flash changes the inductive heating strategy to extend the life of the FICM and still maintain ease of cold starts and injector stiction. It also monitors engine coolant and oil temperature spreads as an indicator of OIL cooler plugging which can cause EGR cooler failure from a lack of coolant flow that keeps hot exhaust gasses from melting welds/solder of the EGR cooler "radiator" fins.
FTE Leadership Emeritus
Joined: Jan 2003
Posts: 161,999
Likes: 75
From: 3rd Rock
Where did you hear or read that?
Thanks guys, I found it. I unplugged the hose from the nipple and it was partially clogged. I reamed it out good.
Tim, the truck has 84k on it and no idea how many times she was re-flashed. The dealer wants $100 to hook it up and re-flash. From what I've been reading, the latest flash has wreaked havoc on the exhaust temp reading spread before and after the EGR cooler. Is getting the latest and greatest re-flash a good idea?
Tim, the truck has 84k on it and no idea how many times she was re-flashed. The dealer wants $100 to hook it up and re-flash. From what I've been reading, the latest flash has wreaked havoc on the exhaust temp reading spread before and after the EGR cooler. Is getting the latest and greatest re-flash a good idea?