EGR issue
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Joined: Mar 2011
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EGR issue
I've got a '97 F-150, 5.4 motor, 4x4 Off Road. All stock.
It recently started throwing codes that the EGR was stuck open. The way it drives it's either true, or a bad sensor is sending a false signal and fooling the computer.
It was recommended that I change the entire "EGR assembly". It's still the factory original and apparently there has been an issue them.
Does anyone have any good advice here? Should I put in a value and sensor, replace the entire assembly, or something else?
Thanks....
It recently started throwing codes that the EGR was stuck open. The way it drives it's either true, or a bad sensor is sending a false signal and fooling the computer.
It was recommended that I change the entire "EGR assembly". It's still the factory original and apparently there has been an issue them.
Does anyone have any good advice here? Should I put in a value and sensor, replace the entire assembly, or something else?
Thanks....
Elder User
Joined: May 2005
Posts: 567
Likes: 1
Please list the DTC codes you got
I've got a '97 F-150, 5.4 motor, 4x4 Off Road. All stock.
It recently started throwing codes that the EGR was stuck open. The way it drives it's either true, or a bad sensor is sending a false signal and fooling the computer.
It was recommended that I change the entire "EGR assembly". It's still the factory original and apparently there has been an issue them.
It recently started throwing codes that the EGR was stuck open. The way it drives it's either true, or a bad sensor is sending a false signal and fooling the computer.
It was recommended that I change the entire "EGR assembly". It's still the factory original and apparently there has been an issue them.
I suspect the issue is similar in your engine, but the exact codes that you got are critical.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
You need to get the code the system uses to tell what the failure is.
Then the system parts that involve the "test" failure are the first to look at.
What is the code?
Codes are a reference to specific test faulures so there are no false signals involved.
It's much more complex.
Recommendations are just guessing.
Then the system parts that involve the "test" failure are the first to look at.
What is the code?
Codes are a reference to specific test faulures so there are no false signals involved.
It's much more complex.
Recommendations are just guessing.
Posting Guru
Joined: Oct 2008
Posts: 1,145
Likes: 1
From: Hernando Ms
DPFE(?) sensor...also...IF the EGR valve were stuck open,the engine likely wouldnt idle at all.A stuck open EGR causes a direct vacuum leak.
Elder User
Joined: Jan 2008
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From: Stockton Ca.
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New User
Joined: Apr 2011
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EGR code p0401
I have replaced the egr valve, dpfe sensor, egr vaccum regulator, and I have the throttle body off and I see no ports clogged. I continue to get this same code. Any advise on resolving this issue.
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Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
The 401 code is low flow when the PCM does a test of the system.
The DPFE is the sensor that reads out the results of the test pressure across a calibrated disc orface inside the metal pipe.
1. are the DPFE hoses on correctly?
2. is the regulator able to pass vacuum to the EGR so it will open when commanded?
3. do a test to see if the engine detects exhaust gas when you open the EGR a little with a hand vacuum pump. This proves the port is open or not.
4. inspect the hoses for cracks, splits etc.
. All there is to the system is vacuum to the regulator to be gated to the EGR.
Exhaust is present under some pressure at the exhaust manifold.
With normal intake vacuum, the combination normally flows exhaust gas toward the intake through the port when the PCM commands the regulator to allow vacuum to the EGR.
You must find the issue within these areas.
The DPFE should be a Ford part and not an aftermarket unit.
Sometimes an after market EGR does not work within Ford spec limits.
Good luck.
The DPFE is the sensor that reads out the results of the test pressure across a calibrated disc orface inside the metal pipe.
1. are the DPFE hoses on correctly?
2. is the regulator able to pass vacuum to the EGR so it will open when commanded?
3. do a test to see if the engine detects exhaust gas when you open the EGR a little with a hand vacuum pump. This proves the port is open or not.
4. inspect the hoses for cracks, splits etc.
. All there is to the system is vacuum to the regulator to be gated to the EGR.
Exhaust is present under some pressure at the exhaust manifold.
With normal intake vacuum, the combination normally flows exhaust gas toward the intake through the port when the PCM commands the regulator to allow vacuum to the EGR.
You must find the issue within these areas.
The DPFE should be a Ford part and not an aftermarket unit.
Sometimes an after market EGR does not work within Ford spec limits.
Good luck.
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