Question about 1995 Mercury Grand Marquis

1 Answer

Code P401 on mercury Grand Marque. EGR valve replaced and code returned in about a week. Could it be th vacum egr regulator?

Posted by on

  • joeanddi May 06, 2010

    I changed the Vacum egr control valve this morning and drove the car about 50 miles. So far the trouble light hasn't come on.

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Mercury Master
  • 14,036 Answers

COULD BE THE EGR VALVE PORT HOLE IN THE INTAKE MANIFOLD IT COULD HAVE CARBON BUILT UP BLOCKING THE HOLE CLEAN IT A SMALL WIRE OR SCREW DRIVER.

Posted on May 05, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Buick errors 420, 401, 1406


P420 is EGR system malfunction P1406 is EGR pintle position problem be sure and check power and ground before condemning the valve and the P401 is catalyst code i would fix EGR code first clear monitors and run a drive cycle to see if the cat code returned although the egr and catalyst are separate systems an EGR that isn't functioning may cause the emissions levels to be too high for a marginal converter to diffuse resulting in the cat efficiency code

Dec 10, 2012 | Cars & Trucks

1 Answer

EGR Code


I had simular problem on 1996 Mercury Marque. Mine was stopped up exhaust port under engine heads = remove heads, clean, replace head gaskets. Also possible that you have a problem with EGR controls, that is due to bad control or vacuum hose off. What does engine analyzer say? Mine was very confusing, listed all kinds of EGR control faults.
Thanks and Good Luck,
Bill

Aug 17, 2012 | 1997 Mercury Cougar XR7

1 Answer

2004 mercury grand marque check engine light on code is p0108 says map sensor or vacum leak but does not have leaks.this car does not have map sensor what else needs to be replaced


PO 108 --- Baro/Map Sensor High Voltage Detected

Yes it does

It is integrated into one unit in the ESM EGR assembly
(possibly)

I have no experience with that,so if you find only an egr valve
& no other sensor with vacuum hoses & wires going to it,replace
the egr valve.

Getting the feeling you missed it

Work the web sites. Put in your motor & EMS Module for egr
& see what comes up

Sep 21, 2011 | 2004 Mercury Grand Marquis

2 Answers

1999 mercury sable engine code p1744,p0401. Failed e check. EGR looks new, replaced egr solenoid then cleared codes. what more can i do about the p0401 code and the p1744 code Thanks


for p0401:
In 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.

Jul 08, 2011 | 1999 Mercury Sable

1 Answer

I replaced egr valve code 401 still comes up on my scanner. why?


The code P0401 is often not a problem with the EGR valve itself. Rather, the EGR system is not allowing enough EGR to flow back into the combustion process to sufficiently cool the peak firing temperatures. Once the code P401 has been retrieved with a scan tool, the freeze frame data should be documented and analyzed in order to determine what engine conditions were present when the code was triggered. It is recommended that the vehicle be driven in such a way as to duplicate the code setting conditions with a data streaming scan tool connected, so the behavior of the EGR actuating components and feedback sensors can be monitored.
Common Tests to Determine Whether the Problem Is an EGR Control Problem, a Plugged or Restricted System, or a Defective Feedback Device
  • Does the engine die, not just stumble, when the EGR valve is manually raised to its maximum?
    (Use either a vacuum pump or bi-directional scan tool if it's a digital EGR valve.)
  • Is the EGR valve getting sufficient vacuum? (Use the manufacturer EGR vacuum spec.)
  • Is the EGR system restricted? (The engine stumbles, but does not die.)
  • Is the EGR system plugged? (Engine RPM does not change.)
  • Does the EGR valve work?
  • Raise the RPM to 3000 and check manifold vacuum. Then open the EGR valve to its maximum-the manifold vacuum should drop by at least 3" of mercury. If it does not, there is a flow and/or restriction problem.
  • Test the EGR temperature sensor (if equipped) with a propane torch and a DVOM.
  • Test the accuracy of the EGR valve position sensor with a scan tool or DVOM by raising or lowering the EGR valve.
  • Test the Digital EGR Pressure Feedback Sensor (DPFE) with a data streaming scan tool to verify that the voltage or lift percentage changes according to spec.
  • Verify that the front Oxygen Sensor readings drop and the Short Term Fuel Trim increases when the EGR valve opens. (EGR leans out the mixture.)

Mar 29, 2011 | 2000 Pontiac Grand Am GT

1 Answer

1998 taurus 24v engine code p401-- what is most common fix?


DTC P0401 - Insufficient EGR Flow

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.

Symptoms: You 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.

Causes: A 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 Solutions: In 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


hope this helps (remeber to rate this answer).

Jan 12, 2011 | Ford Taurus Cars & Trucks

1 Answer

The engine light on our 1986 Mercury Grand Marquis came on and stayed on. When checked, a code of 34 comes on. What does this code mean?


code 34 means you are not getting any egr flow. find your egr valve and check to see if vacume hose is attached, if so follow the hose to the egr solenoid which should have that hose and a direct vac hose going to it. and an electrical connector. make sure all of these things are in place and not disconected or broken. the most likely cause is either a broken vacume hose or a clogged intake manifold.

Jul 10, 2010 | 1986 Mercury Grand Marquis

1 Answer

P401 code?


P0401 OBD-II Trouble Code - 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.


Symptoms
You 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.


Causes
A 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 Solutions
In 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


Hope this helped (remember comment and rated this).

May 05, 2010 | 2002 Honda Passport

1 Answer

Code p401..egr .replaced egr still light comes on.


your code relates to the egr system, vacuum hose leaks are more common for code setting. Also check vacuum modulator as they are known to faile more often than egr valve. If all check out o.k. and there are no exhaust leaks, suspect e.c.m. problem.

Jan 30, 2010 | 2000 Toyota Camry Solara

Not finding what you are looking for?
1995 Mercury Grand Marquis Logo

505 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts

yadayada
yadayada

Level 3 Expert

75197 Answers

fordexpert

Level 3 Expert

5481 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...