EGR code, 97 Mountaineer

skimo600 · #1 12-14-2003, 09:35 AM

My truck runs fine but I get this check engine light, says its the egr valve. Would it then be more likely to be a sensor or something else. Ounce in a while, the light goes off. I was told that if it runs fine, its probably something else but I would like some help on this and where to look. Is there a way to check the sensor with a meter or maybe jumper the sensor out and see if the check engine light goes off. Sounds like I could stick a lot of money into this otherwise to find the problem

mk30263 · #2 07-02-2004, 01:40 AM

I was out of town till today and the wife called - said she had the same code. Well, she took it to Advance Auto Parts and they tested P0402. EGR Flow Excessive. As they explained to her , the vavle was probably stuck and causing excessive carbon dioxide to be release. It wouldn't do nothing to the vehicle, except keep it from passing emissions. They also said the valve was most likely not bad and just needed to be removed and cleaned (probably stuck). If you do replace it, they said it was a dealer part (not sure on that).

I'm taking mine out tomorrow and cleaning it up. If you want I can let you know what I find.

rivguy · #3 08-08-2004, 03:05 PM

to start with never beleive what the parts store tries to sell you on - the dpfe sensor is stuck and needs to be replaced - see my other many posts for egr codes on fords - it's always the sensor and that isn't just my thought - that comes straight out of the tsb from ford themselves

flamen19 · #4 09-17-2004, 03:04 AM

on my 97 mountaineer i found a tube hanging under the front drivers side tire that looks as if it has been broken off from the conector. it says its the evap check valve 1psi. a few days latter the check engine light came on and it came up with the same error, the auto parts store tried to sell me a new gas cap. i took it to a dealer and they said that the tube is the problem but they have no idea where it goes. they looked at the map in the computer for about 30 min and have no idea where the hose goes since it is a check valve. i havent been able to find where it conects to and they quoted me about 125$ to try and find it. it doesnt seem to affect anything but the light. the only times it goes off is if you remove the battery, reset the light (it stays off for a day or two) or when i was towing a trailer a long distance it stayed off. anyone have any input it owuld be appreciated.

Adam Holmes
[email protected]

rivguy · #5 09-20-2004, 04:53 PM

the evap vapor managment valve is mounted in the front of the fender well - the vac line to this valve is known to break - just remove the screws and pull the fender liner back and check the valve - there should be 2 large hosed and 1 small hose - also has a 2or3 pin electri connector

jmmilleritc · #6 03-12-2005, 02:33 PM

I have a 97 5.0 AWD Mountineer and I too am getting an EGR code. Mine is a P0401 - "EGR FLOW INSUFFICIENT" I've replaced the EGR valve, the Vacuum Solenoid, and on a suggestion of a friend the PCV valve all to no avail.

And now I'm also getting a P0125 Closed loop fuel CTRL Insufficient Coolant temp. Can anyone give me some direction on what to try next?

rivguy · #7 03-14-2005, 07:12 AM

the 0401 is the dpfe sensor - and the 0125 is normaly caused a bad thermostat.

jmmilleritc · #8 03-14-2005, 01:29 PM

Thanks I'll try replacing them.

Jim

bumpinkicker04 · #9 05-20-2005, 03:28 AM

Quote:

Originally Posted by jmmilleritc

I have a 97 5.0 AWD Mountineer and I too am getting an EGR code. Mine is a P0401 - "EGR FLOW INSUFFICIENT" I've replaced the EGR valve, the Vacuum Solenoid, and on a suggestion of a friend the PCV valve all to no avail.

And now I'm also getting a P0125 Closed loop fuel CTRL Insufficient Coolant temp. Can anyone give me some direction on what to try next?

Try the oxygen sensors.

jabrunn · #10 05-20-2005, 09:54 AM

Quote:

Originally Posted by jmmilleritc

I have a 97 5.0 AWD Mountineer and I too am getting an EGR code. Mine is a P0401 - "EGR FLOW INSUFFICIENT" I've replaced the EGR valve, the Vacuum Solenoid, and on a suggestion of a friend the PCV valve all to no avail.

And now I'm also getting a P0125 Closed loop fuel CTRL Insufficient Coolant temp. Can anyone give me some direction on what to try next?

I got the exact same code on my 99 Mountaineer and it turned out to be the DPFE sensor. I purchased one at Auto Zone for about $55. It seems Ford has trouble with their Idle Air Control valves and DPFE sensors because we replaced the exact same sensors on our 95 Taurus. I'm not sure where the DPFE sensor is located on the 4.0L V6 but I'm pretty sure it's made of black plastic with two hoses connected to it. The DPFE sensor on my 5.0L V8 is located on the back side of the engine next to the firewall. It is made of aluminum (or some other metal) and is silver in color with two hoses connected to it. This sensor monitors EGR flow and can become clogged with carbon deposits (as was the case with mine). Hope this helps.

bumpinkicker04 · #11 05-25-2005, 04:30 PM

Quote:

Originally Posted by jabrunn

I got the exact same code on my 99 Mountaineer and it turned out to be the DPFE sensor. I purchased one at Auto Zone for about $55. It seems Ford has trouble with their Idle Air Control valves and DPFE sensors because we replaced the exact same sensors on our 95 Taurus. I'm not sure where the DPFE sensor is located on the 4.0L V6 but I'm pretty sure it's made of black plastic with two hoses connected to it. The DPFE sensor on my 5.0L V8 is located on the back side of the engine next to the firewall. It is made of aluminum (or some other metal) and is silver in color with two hoses connected to it. This sensor monitors EGR flow and can become clogged with carbon deposits (as was the case with mine). Hope this helps.

What is a dpfe sensor and where is it located? I got the EGR code too and replaced it but the check engine light is back on. I have not had it checked but from reading these forums i think i know what the code is gonna be.

exploded99 · #12 05-26-2005, 02:17 AM

There are two temperature sensors on your 5.0 - one feeds info to the temp gauge on your dash. The other is under your coil packs and feeds temp info to the computer.

If your dash gauge does not show any change in engine temperatures, the thermostat probably is working ok - altho it might be a good preventative maintenance thing to do.

If you are setting a low temp code and your engine temp seems ok by the temp gauge, change the temp sensor under the coil packs. Sounds to me like it is failing.

Engine temperature also figures in to what the computer tells the EGR valve to do. Its possible when you change the temp sensor and the computer gets the correct engine temp info the EGR code will go away. Sometimes you get lucky!

exploded99 · #13 05-26-2005, 02:42 AM

Quote:

Originally Posted by jmmilleritc

I have a 97 5.0 AWD Mountineer and I too am getting an EGR code. Mine is a P0401 - "EGR FLOW INSUFFICIENT" I've replaced the EGR valve, the Vacuum Solenoid, and on a suggestion of a friend the PCV valve all to no avail.

And now I'm also getting a P0125 Closed loop fuel CTRL Insufficient Coolant temp. Can anyone give me some direction on what to try next?

Oh, by the way, when you buy the temp sensor double check that you have the one for under the coil packs.. The parts boobs at autozoned out will sell you the wrong one two out of three times. The wrong one fits right in, and you get the check engine light again......

I'm sure you all hear the voice of experience talkin' here.

bumpinkicker04 · #14 05-26-2005, 10:56 AM

Quote:

Originally Posted by exploded99

Oh, by the way, when you buy the temp sensor double check that you have the one for under the coil packs.. The parts boobs at autozoned out will sell you the wrong one two out of three times. The wrong one fits right in, and you get the check engine light again......

I'm sure you all hear the voice of experience talkin' here.

thanks

72flameorange · #15 10-10-2005, 02:46 AM

I have a 97 Mountaineer with 73K on it. Owned it since new and been babyed every mile. For the last 10K I have been experiencing usually on cold start ups when I go and drive it and slow down to come to a stop the RPM's will pretty much fall flat on their face and stay around 100 to 300 RPM's. If I give it some gas it is hesitant, but if I stay on the gas slightly the RPM's will pick back up and idle normally. When giving it gas after this, the RPM's seem a bit sluggish to regain control under acceleration. This same thing can happen 3 to 4 times while driving it and coming to more stops. But sooner or later when it warms up it wont do it. I have had no engine check lights come on. I have been told it is the IAC Valve for sure by a few Ford dealerships, but wanted to come on here to get some of your folks' ideas before giving them my next pay check. Any help appreciated, thanks, Andrew.

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