EGR Valve???

what was the codes ? most common EGR PRESSURE FEEDBACK SENSOR

Just changed the EGR and the DPFE sensor. These lines don't add up. I have the diagram here and it doesn't make sense. It's almost like I'm missing a line. In my photo the red line has a 90 deg bend into the intake, and also there is a red line coming from a solenoid next to the fuel rail. That red line ends.. open? I have 2 fittings here I found sitting on the transmission. One with green plastic but the plastic line is hooked up.

Okay, I may have jumped the gun and asked this question, I found the remainder of the line which is a connector to the rear of the intake with a red line. however the picture with 2 fittings I pieced together to join the remainder of the red line together. Is that how it is supposed to go? It seemed to run fine. My engine light is staying off but for some reason when I do an OEM Enhanced scan it shows P1519 showing up.

Hello,

I have included the vacuum hose diagram for your vehicle in the diagrams down below. The DPFE sensor should just have an electrical connector and two hoses that go to the exhaust manifold as it measures the exhaust pressure in your vehicle. There should be no vacuum lines going to it. I hope this helps.

Thanks,
Alex
2CarPros

Has nothing to do with the DPFE, only the green and red plastic lines going to the intake, FPR, EGR, and solenoid. I pieced those two black plastic fittings together to join the remaining red line.

The car starts and shoots to 2,000 rpm's, then sits at 1500 for a few seconds, and finally rests at 700-800 rpm's. Is that okay? Feels like it has more power after this new EGR and sensor, does that make sense?

Hello,

Yes, it is okay. What is going on is the Power-train Control Module [PCM] has the timing retarded so the combustion event is happening much later to actually get it so it is happening that fire is actually going out the exhaust valve to get the O2 sensor[s] up to operating temperature as quickly as possible so it can switch from open loop operation to closed loop operation. When the rpm's do this, it is the PCM controlling the Idle Air Control [IAC] valve operating the engine rpm's as needed. This is normal for this year of vehicle. My 1997 Mustang GT does the same thing.

Thanks,
Alex
2CarPros

Okay, well it didn't do it before the new EGR, DPFE sensor, and hoses. So could this mean that the vacuum is better and that this is a good thing? or the opposite?

Hello again,

Okay the Exhaust Gas Circulation [EGR] valve should be closed and only recycles exhaust gas when at cruising speeds like going down the highway. If it was open at idle your vehicle would stall because there is just enough air passing the closed throttle plate to keep the vehicle idling through the Idle Air Control [IAC] valve. The DPFE is a sensor that deals with the exhaust pressure and doesn't have any vacuum lines attached to it. The EGR valve is vacuum controlled through the EGR vacuum control regulator which is a PCM controlled vacuum one way gate. I don't know why it wasn't operating in open loop before, but, I assure you, this is how this years vehicle's are supposed to operate.

Thanks,
Alex
2CarPros

I fixed the above vacuum lines but I'm still getting a P0401 code. I replaced the EGR valve, DPFE sensor, and exhaust hoses going from the sensor to the EGR tube.

Hello again,

In the diagrams down below I have included the diagnostic troubleshooting guide for DTC P0401 from the vehicle manufacturer. Please go through the guide and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

seems like p0401 may be intermittent. What does HE90 say? It may come on after a couple weeks, or months, sometimes every other day. It's never consistent. I almost think it's the control solenoid because that's the last thing to replace. I don't have vacuum gauges and you can forget getting a multi-meter on the DPFE sensor.

Hello again,

Okay, so I have included HE90-92 in the diagrams down below. Please go through this guide and get back to us with what you find out.

Thanks,
Alex
2CarPros

There's nothing there...

Hello again,

I'm sorry about that. This happens to me from time to time. Here they are. A little trick that I've used before is where they want you to install a breakout box is to use the PCM electrical connector and small safety pins instead. The breakout box is a box that goes inline in between the PCM connector and the PCM with big holes for every pin on the PCM. You can stick the leads of your DMM into the holes and it is the same thing as inserting them into the PCM connector, but without the possibility of damaging the PCM electrical connector. Using small straighten out safety pins, and I emphasize small, you should be able to insert the safety pin into the corresponding PCM electrical connector female pin and then touch with the DMM lead and accomplish the same thing. The small safety pin will fit snug and will not damage the PCM electrical connector female pin. This is extremely important and please be very delicate when you do this. Please get back to us with what you find out.

Thanks,
Alex
2CarPros

Well, the light hasn't come back on yet. I cleaned the EGR port on the intake. It was pretty dirty. Also, I found that a metal arm attached to a lever was disconnected. It looks like the lever is attached to an "intake manifold runner control valve", Part # 911928. This arm is held in the lever by two little white bushings (part #47099). Do you think that has anything to do with it? The car seems to start right up very quickly now.

Hello again,

Absolutely. The intake manifold runner control is vacuum operated and if there is a leak there, then that's a vacuum leak and that would cause your vehicle's symptoms.

Thanks,
Alex
2CarPros

Visiting this again because it's still happening. Read something somewhere about the C channel might be clogged. Look at this!! This apparently goes right to the EGR. Hope cleaning this will do the trick.

i have a faulty egr code ive replaced the egr valve and sensor, plugs, wires, filters and light is still on. if my car is idling if rev it two two 2000-rpms and let go it falls all the way to 0 almost stalls and then idles kinda low not exactly sure where it should be at 1 -900 -8 00? when it idles low my oil light flickers not sure why? oil is fine and it kinda sounds like it might miss very very slightly when i rev it up or hold it steady in park, also if i hold the pedal steady the rpm still moves a little bit . i dont notice it while im driving but if im kinda coasting at 30 to 40 mph my rpms drop and bounce till i get on the gas or slow down hard its been doin all this for a little while and it doesnt seem to good for the car.....pleeze help also i think maybe i just notice every little thing to that could be it. and also i use regular gas

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

You found the problem my friend, nice work. Let us know when happens after you clean it.

I have a2000 Ford Taurus sel which on start up runs really rough to the point of stalling and also will stall once in awhile while in drive with the brake pressed down while like at a light. But in neutral it will rev low but not stall recent work done includes new plugs ,2 coils, egr valve, 4 02 sensors ,and new belt .please any helpful advice would be appreciated.

try cleaning throttle plate on both sides with choke cleaner also iac hole

A!so the emissions light keeps coming on and it I've noticed it only been doing it worse since the weather has been colder.

if that is the case then scan for codes and check fuel pressure with a gauge.....autoparts rent gauge and can scan for codes.

OK thanks I will let you know

OK cleaned the iac and replaced 2 coils still running rough on start up acceleration is a little hesitant and emissions light is blinking

got a diag. code was "egr low pressure". it also kinda idles rough. i plan on replacing the egr value, pipe and pressure sensor. ANY feedback on this topic is greatly appreciated.

If its p0401,remove egr then use a steel coathanger and push it through the port all the way through to the throttle plate. Clean the egr of carbon and vacuum test it. If it opens and.closes as it should and holds vacuum, put it back on. If the light and code.come back. Replace the sensor.

did you get it scanned for codes? you probably have a misfire or egr valve hanging open or partially blocked along with differential egr pressure sensor or something similar.

Don't forget the DPFE sensor.

A "clogged" EGR valve could not cause a poor idle, as it's supposed to be closed at idle. Pinging under acceleration, higher operating temperatures maybe. But it would have to be stuck open (or otherwise open when it's not supposed to be, which includes at idle) to cause a poor idle quality.
So, which actual code was this anyway? Because I can't think of any "low pressure" that would relate to the valve itself. It operate on vacuum not pressure. Maybe the pressure sensor, but not the valve.
If we had the actual code, maybe someone who knows what's what could clear this up, and save you a lot of money wasted on perfectly good parts being replaced?

It can cause poor idling if the port is clogged all.the wau to the throttle plate. Because this will affect the idle.air control valve. Remove this as well and check the pintle.

With no code its a gess . Hi fail rate is the dpfe. None of which would make idle poor.only if it was sticking open.

It will if it's clogged with carbon and not allowing the pintle to seat.

My engine light came on and i took it to get looked at by my local mechanic. He said the problem was most likely had something to do with the EGR valve. I was wondering if I dont get it fixed right away, what kind, if any, problems come along with this.

hi most likely no probs will come with this. it could possibly have an erratic idle down the road. but if the code is for the sensor or egr valve.other then not passing emission test.you will be fine billymac

my engine light is on and i read the code, the code was p0401 it is egr insufficant flow, i was woundering what that could be if it is a egr vavle problem of vacum problem

check vacuum line on the EGR valve
check EGR position sensor and replace if needed
check the two hoses on it too.

remove EGR and clean intake side passages

Engine problem
1999 Ford Taurus V6 Two Wheel Drive Automatic 14339 miles
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i have two questions really. one is my car when first started in the mornings or after a period of over eight hours not running will stall out multiple times before running well. someone told me EGR valve but i disconnected that and still have same problem when hooked up the car gets horrible gas mileage. Any advice? Also when looking under my hood to winterize my car i do not find a radiator just an overflow jug. does this mean i use dexcool or what sort of antifreeze?

No Dexcool is a GM product...Get a can of spray gumout, start the car and spray around, pay attention to vacuum lines and manifold, if the idle changes, you found a leak. Poor mileage and these symtoms, I suspect a vacuum leak and or the need for a tune up!