Question about 2002 Mazda Tribute

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Egr valve Egr back feed pressure sensor broke into pieces in the engine and I have replaced it. but the car still has to little power to make it to a gargae

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Posted on Jan 02, 2017

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SOURCE: 2002 egr valve problems

That would be exactly what I would look for... When the catalytic honeycombs become blocked, it causes a build-up of exhaust pressure... and this restriction in the exhaust will also have a very definite effect on engine performance: The typical symptoms are an engine that initially seems to running okay, but slowly loses power.. in severe cases it will lose power to the point the engine stalls and will not restart until the pressure build up bleeds off.

Good luck with the problem --- it sounds like you are on the right track. And don't forget to rate my advice: your approval is my "paycheck"!


Posted on Jul 13, 2008

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SOURCE: I got the code p0400 1.

first take the egr valve off then get some carb cleaner spray it into the egr valve ports let sit 30-60min then take a small flat head clean any carbon left over in it. then check the vaccume lines to it they to might be plugged you can take a small wire or push pin and stick it in the ports to unplug it.

Posted on Sep 06, 2008

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SOURCE: I have a '95 2.5 Millenia. the check engine light

This is all due to a loose connection somewere. If your car had been worked on check all connector that are not plugged in tightly. Some newer cars even have a special lock lever to the connectors, and if not connected properly you would have all kinds of code poping up.

Posted on Aug 13, 2009

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SOURCE: EGR code keeps coming on

It may be, but the code will specify what the problem is as a lot of things can trigger an EGR code. There are numerous codes that relate to the EGR, but the individual code will usually pinpoint what the issue is.
Some causes could be the DPFE sensor is faulty; 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

Posted on Aug 25, 2009

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SOURCE: were is the egr valve located for mazda rotege5

2002 Mazda Protege5 with the FS2.0 Motor. The EGR Valve is located below the throttle-body. You must take off the Intake tube to get a good view of it. To replace it I think you might have to take off the throttle-body.


Fig. Exploded view of the intake manifold assembly with 2.0L (FS) engine

Good luck (remember rated this).

Posted on Jun 25, 2010

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EGR Valve keeps blowing out and no power

EGR valve blow-out can be caused by a clogged catalytic converter. A clogged cat. converter will cause pressure to back up in the engine. A test to perform is remove the front oxygen sensor from the exhaust to see if the engine runs better. Removing the oxygen sensor will relieve the pressure if, in fact the cat. converter is clogged. Another cause for EGR blow-out could be that the timing has jumped.The timing can be checked to diagnose this issue.

Mar 28, 2014 | 2003 Mazda Tribute


DFPE Differential Feedback Pressure Exhaust sensor

<p><b><span>1.7) <span> </span><u>DFPE - Differential Feedback Pressure Exhaust </u>(sensor)<u></u></span></b><br /> <p><b><u><span><span> </span></span></u></b><br /> <p><b><span>What is it?</span></b><span> This is an electrical device that measures the differential pressure between two ports on the pipe that supplies the exhaust gases to the EGR.</span><br /> <p><span> </span><br /> <p><b><span>Where is it located?</span></b><span><span> </span>The DFPE is located near to both the EGR and the exhaust feed-pipe to the EGR.<span> </span>THE DFPE makes two piped connections to the exhaust feed-pipe in front of the EGR valve</span><br /> <p><span> </span><br /> <p><b><span>How does it work?</span></b><span><span> </span>The two pipes on the exhaust feed-pipe are connected at two separate sites.<span> </span>When exhaust flows through the feed-pipe it creates a differential in pressure between the two ports and the DPFE detects this and responds by altering a voltage output to the ECU.<span> </span>The ECU is able to detect for how long and by how much the EGR is open by monitoring the DFPE output.<span> </span>Until the engine has warmed the DFPE signal should indicate no EGR activity as the ECU disables the EGR from opening when coolant (engine) temperature readings are low.<span> </span>The EGR is kept closed by either the ECU not sending voltage to the EGR actuator (in cases of direct motor/solenoid control of the EGR) or by not charging the <b>vacuum control solenoid valve</b> on the vacuum line to the EGR (in cases where vacuum is used to actuate the EGR). <span> </span></span><br /> <p><u><span><span> </span></span></u><br /> <p><b><u><span><span> </span></span></u></b><br /> <p><b><u><span>Symptoms of faulty DFPE</span></u></b><span> </span><br /> <p><span> </span><br /> <p><span>The DFPE may misread the differential pressure leading to the ECU opening or closing the EGR valve at the wrong time.<span> </span>The symptoms mimic very much the effects of a faulty <b>EGR</b> namely:-</span><br /> <p><span> </span><br /> <ul> <li><b><span>Erratic idling</span></b><span> - if DFPE signals 'no pressure' in error and ECU opens the EGR valve.</span></li> <li><b><span>Misfire ('pinking')</span></b><span> - if DFPE detects 'pressure' in error and ECU keeps EGR closed. </span></li> </ul> <p><span><span> </span></span><br /> <p><b><span>Note:</span></b><span><span> </span>Sometimes a DPFE fault can be misdiagnosed:<span> </span></span><br /> <p><span>1) If the <b>coolant temperature</b> sensor is at fault and sends an incorrect 'the engine is warm' signal then the ECU responds by opening the EGR valve prematurely causing the engine to stumble and stall.<span> </span>This pattern looks very much like a fault from the DPFE when in fact the DPFE might be working perfectly.</span><br /> <p><span>2) If the <b>vacuum control valve</b> fails to open when instructed.<span> </span>Apply 5 volts between the socket pins on the valve to check for valve opening.<span> </span></span><br /> <p><span> </span><br /> <p><b><span>How to Check?</span></b><span> Applying pressure to one or the other ports on the DPFE should result in a change in electrical output as detected by a volt meter.<span> </span>No change in voltage output indicates the DFPE is faulty.</span><br /> <p><span> </span><br /> <p><b><span>How to Fix?</span></b><span> Make sure the pipes to the DFPE are free of leaks and clear of carbon deposits.<span> </span>If the DFPE is itself faulty then it must be replaced.</span><br /> <p><span><br /></span><br /> <p><span><b>NEXT 1.8) PCV Positive Crankcase Vent valve</b></span><br />

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

95 cougar 4.6l wont pass emissions heavy smoke out tailpipe but runs fine spark plugs are new,no misfires, rechecked plugs and are not oil or fuel soaked. all fluid levels are staying the same. have egr...


Oct 12, 2011 | 1995 Mercury Cougar

1 Answer

I replaced the EGR valve on the car and now have an error code indicating "EGR valve insufficient air flow..." I cleaned out a lot of carbon and junk that I could reach with a short piece of wire...

The air flow through the EGR is usually detected by a DPFE (differential Pressure Feedback Exhaust) sensor. The DPFE is connected by two pipes/ports on the exhaust feed pipe leading to the EGR. This sensor measures the pressure difference (differential) in the two pipes when the EGR is open; the more open the EGR the more the pressure imbalance detected by the DPFE. If the pipes/ports to the DPFE become clogged or the sensor malfunctions, the signal to the ECU will be seen as incorrect as compared to how much the EGR has opened...'insufficient air flow'. It is just as likely for the DPFE to fail as the EGR when there are 'EGR problems' . Hope this gives you another thing to check

Sep 21, 2011 | 1996 Geo Prizm

2 Answers

Need to find and replace the DPFE-15 sensor. Dealership diagnosed when service engine light came on and saaid this is what needed replacing. Problem is I do not know where to find it on the engine.

Exhaust Gas Recirculation (EGR) System The exhaust gas recirculation (EGR) system is designed to:
  • reintroduce exhaust gas into the combustion cycle.
  • lower combustion temperatures.
  • reduce the formation of oxides or nitrogen (NOX).
The amount of exhaust gas reintroduced and the timing of the cycle varies by calibration. Timing and volume are controlled by the following:
  • engine rpm
  • engine vacuum
  • exhaust system back pressure
  • engine coolant temperature
  • air charge temperature
  • throttle position
The EGR valve (EGR valve) (9D475) is vacuum-actuated. The vacuum hose routing diagram is shown on the Vehicle Emission Control Information (VECI) decal. The EGR system is a differential pressure feedback EGR Sensor system. Differential pressure feedback EGR Sensor is a subsonic closed loop EGR system. The differential pressure feedback EGR system:
  • monitors EGR flow rate by the pressure drop across the metering orifice located in the EGR tube.
  • uses a differential pressure feedback EGR sensor as the feedback device.
  • uses the EGR valve only as a pressure regulator, rather than a flow metering device.
  • controlled pressure is varied by the valve movement using vacuum output of the EGR vacuum regulator solenoid (9J459).
  • allows for a more accurate assessment of EGR flow requirements.

Differential Pressure Feedback EGR Flow Diagram


Differential Pressure Feedback EGR Sensor Removal
  1. Disconnect engine control sensor wiring (12A581) from Differential Pressure Feedback EGR Sensor.
  1. Disconnect Differential Pressure Feedback EGR Sensor hoses from EGR valve to exhaust manifold tube (9D477).
  1. Remove retaining nuts or bolts (depending upon application) and EGR Differential Pressure Feedback transducer.
  1. Follow removal procedure in reverse order.
  1. Tighten retaining nuts or bolts (depending upon application) to 5-7 Nm (45-61 lb-in).

    Differential Pressure Feedback EGR Sensor, 3.0L (2V) Engine


    Differential Pressure Feedback EGR Sensor, 3.0L (4V) Engine


    Item Part Number Description 1 6049 RH Cylinder Head 2 - Differential Pressure Feedback EGR Sensor 3 - Nut (2 Req'd) 4 - Stud Bolt 5 - Bolt (2 Req'd) 6 - Differential Pressure Feedback EGR Sensor Bracket A - Tighten to 5-7 Nm (45-61 Lb-In) B - Tighten to 8-12 Nm (71-106 Lb-In)

    Engine Emission Control Component Location-3.4L SHO Engine


    Item Part Number Description 1 95607-05200 Nut 2 - EGR Sensor Hose 3 - EGR Sensor Hose 4 95027-08016 Bolt 5 - Differential Pressure Feedback EGR Sensor 6 9J433 Differential Pressure Feedback EGR Sensor Mounting Bracket 7 9D474 EGR Solenoid Vacuum Valve (2 Req'd) 8 A4670 Vacuum Tube Assembly 9 9424 Intake Manifold 10 9J459 EGR Vacuum Regulator Solenoid A - Tighten to 5-7 Nm (45-61 Lb-In)
Hope this helps

Aug 14, 2011 | 1999 Ford Taurus

1 Answer

Would replacing the egr valve fix the other faults such as egr solenoid fault,egr pressure sensor fault and egr positionsensor fault

The EGR valve can be tested with a Vacuum pump. If the diaphragm is bad, the valve will not change positions. Hence the error Code for the position sensor not opening to allow the valve to work. And the error code for the pressure sensor not registering a change in pressure because the EGR valve did not work.

So both sensors can give a false Code. On the other hand, you will see both sensors have Vacuum lines and electric connections. When the electricity is switched on, vacuum is suppose to flow back to the EGR Valve. That is why the first thing you do is test the EGR Valve to see if the diaphragm is broke.

If the EGR valve holds pressure it should be okay. Then you would want to check for pressure in the lines coming off of the switches. Remember to clear the onboard computer each time you replace a part, or you will get 25-35 Startups worth of false information.

Both Autozone and Oreillys will scan or clear your car for free. I hope you find my solution very helpful. You usually don't have a complete failure of all 3 parts at the same time.

Dec 12, 2010 | 2000 Ford Taurus

2 Answers

Service engine code P0402 for Ford Mustang

P0402 OBD-II Trouble Code - Exhaust Gas Recirculation Flow (EGR) Excessive Detected

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 (DPF). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0402 code means that OBD detected an excessive amount of EGR.

You may notice drivability problems such as the engine may surge off idle. There may also be other symptoms.

A code P0402 most likely means one or more of the following has happened:
* The DPFE (differential pressure) sensor is faulty and needs to be replaced
* There is a blockage in the EGR (most likely carbon buildup)
* The EGR valve is faulty
* The EGR valve may not be opening due to a lack of vaccuum

Possible Solutions
With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor.
* Check the voltage at the DPFE sensor both at idle and when the EGR is open
* Replace the DPFE sensor

Hope helps (remember rated and comment this).

May 27, 2010 | 2001 Ford Mustang

2 Answers

2003 Grand Am: Just replaced egr valve car has and cleaned maf se... throws a check engine code for the EGR valve.... car has noticeably less power (especially on the highway)and fuel mileage is noticably worse.
Cause....catalytic converter.

May 17, 2010 | 2003 Pontiac Grand Am

4 Answers

Insufficient egr flow, already replaced egr valve and purge valve canister

I too replaced the egr valve and was discouraged that the check engine light came back on with the same "insufficient flow" code. I took it to my mechanic to put it on the monster diagnostic machine. It said "check all vacuum line, and or map sensor". After looking real close we found a melted vacuum tube, and a cracked vacuum angle connector. Replaced both vacuum pieces, reset the codes, and good to go. If that fails than the next thing is the map sensor, that tells the EGR valve what to do.

Jan 12, 2010 | 2002 Chevrolet Impala

1 Answer

My 2001 E150 4.2L has a high input EGR sensor problem

Check the pipe that feeds the DPFE for cracks, if that's ok, check the Engine's back pressure at the front O2 sensor port. It should have no more than about 1 lb of back pressure max. If it's higher, you may have a faulty cat converter. (they're not cheap) When they go they sometimes plug the muffler with debris.

Jun 06, 2009 | 2001 Ford Econoline

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