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Where is the EGR valve located

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
If it happens again. You have a backpressure problem, or, a restriction in the exhaust!
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
TAURUSWHEEL
  • MECHANIC
  • 718 POSTS
Are you experiencing any run issues like pinging, any check engine light? If the egr isn't up to snuff, pinging is usually the result, it could be still opening, but not enough, however pinging can also be caused by dirty intake valves, or various carboned-up parts and orifices.
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
FLCRACKER610
  • MEMBER
  • 3 POSTS
Hi TaurusWheel
Thanks for responding my questions.
It runs rough an idle, sometimes it quits running just as you step down on the gas when leaving a stop light. Other than that it runs OK, I guess, it’s my stepdaughters car and sometimes it hard to useful information from her.
How could the EGR pressure sensor and the rubber tube connecting the sensor to the EGR valve / exhaust manifold pipe becomes damaged from excessive heat? Is there a restricting orifice inside the metal tube? The EGR sensor tube was repaired a few months ago because it had broken off the larger air pipe. Maybe a restriction was inside this tube and became damaged or lost at the time of repair and because it’s missing it allows too much exhaust gas out of the tube and damaging the sensor?

Because of the cost of the replacement EGR pressure sensor, I would like to understand the root cause of the damage to original sensor.
Any Idea’s?
Thanks
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
SHAWNPAUL
  • MEMBER
  • 2 POSTS
  • 1997 FORD TAURUS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 197,020 MILES
How can you tell which is the high and low on a
EGR Valve Pressure Sensor
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
SHAWNPAUL
  • MEMBER
  • 2 POSTS
Where the hoses go form the egr to the sensor
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
DOCTORD453
  • MEMBER
  • 46 POSTS
Sounds to me like a similar problem I am having with my 2003 Taurus. Was giving code for DPFE sensor. Replaced sensor but wasn’t the problem. After blowing the hose off the new DPFE sensor and breaking the plastic hose nipple off. I have since learned that there is too much back pressure in the exhaust system indicating a possible problem with he catalytic converter being stopped up. This, causing the hot exhaust gas to blow back through the DPFE sensor. Probably how yours was melted. Check your catalytic converter for restricted flow.
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The sensor is marked and the hoses are 2 different sizes.
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Yep happens all the time on these cars,

Here is a guide to help confirm the issue.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Great addition to this thread! Please feel free to help out whenever you are on the site :)

Cheers, Ken

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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
DOCTORD453
  • MEMBER
  • 46 POSTS
Thanks Ken. I really didn’t know if I was suppose to reply to this post or not. But felt it might be helpful information. As this site is where I was given the information originally to deal with my problem. Hope you find the solution.
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
I have only seen a plugged cat do this kind of damage to the DPFE sensor.
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
R W HARRIS
  • MEMBER
  • 1 POST
  • 1994 FORD TAURUS
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 92,000 MILES
I have a 1994 Taurus with a ruff idle. My Son run some Seefoam thru the intake and in the gas, after that the ruff idle started. I have run a code check and got a 335 Pressure Feedback EGR (PFE) sensor or EGR Pressure Transducer (EPT) - signsl voltage higher or lower than expected.

Thank you RWH
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean out the EGR valve passages and see what happens. Adding chemicals to it can displace thing around.
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
KFULLER
  • MEMBER
  • 2 POSTS
  • 1999 FORD TAURUS
I have a 1999 Ford Taurus w/ 6cyl. Engine. Engine trouble code showed up as an EGR insufficient flow detected. I replaced EGR valve. Code stayed gone for a few days and reappeared as same problem. Ive looked for vacuum leaks but cant seem to find one. Car seems to idle high on start but goes down withing a minute or two. Any suggestions?
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
TAURUSWHEEL
  • MECHANIC
  • 718 POSTS
Usually it's not the egr valve itself, it's the dpfe sensor, that little gray plastic thing with a couple of small rubber hoses attached to it, they are a known failure part. Their job is to detect flow. Egr valves I've never replaced one. What is the code you got? As far as high idle, it's programmed that way from a dead-cold start, unless you're experiencing a really high idle, then there may be another issue
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the DPFE sensor as recommended my dime is on it.
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Don't replace any more parts till you remove the erg and clean the channel inside. You will find it's caked with carbon. I use a steel coathanger to do it! Then have the light turned off at autozone. If it comes back on replace the egr position sensor. Let me know! Clean or push the coathanger till you can see it in the throttle body at the butterfly. Let me guess the code is p0401? You must have the computer reset for the light to go out! Or drive it 15 times on the highway for some distance.
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
KFULLER
  • MEMBER
  • 2 POSTS
Yes, the code is po401. Ive had the code cleared twice. It stays off for a day or two and then comes back on, throwing the same code. I rechecked the carbon build up today in the new parts, clean. Havent checked the egr position sensor though or the dpfe sensor.
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Tuesday, April 2nd, 2019 AT 5:10 PM (Merged)
Tiny
JBECKETT
  • MEMBER
  • 2 POSTS
  • 2001 FORD TAURUS
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 215,500 MILES
Recently my check engine light came on, and it started hesitating at low rpm cruising (say 25-35 mph steady on level ground) and under light acceleration. I replaced the EGR valve and the EGR flow sensor, which got rid of the check engine light, but didn't completely eradicate the hesitation. 3 months later, the light is back on and the hesitation is starting to get worse again. I also replaced the PCV valve, but that produced no results.
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Saturday, April 20th, 2019 AT 11:49 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Insufficient EGR Flow

What does that mean?EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.

SymptomsYou may notice drivability problems such as pinging (a.K.A. Pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

CausesA code P0401 most likely means one or more of the following has happened:

The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
There is a blockage in the EGR (tube), most likely carbon buildup
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum
Possible SolutionsIn fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.

Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
Clean out the EGR valve and/or tubing to remove deposits
Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
Replace the DPFE sensor (with a good quality / OEM one)
Replace the EGR valve
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Saturday, April 20th, 2019 AT 11:49 AM (Merged)

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