Egr removal

[Explorer Power]

Hi there,

Yesterday i took of the vacuum line from the egr valve and plugged both ends. It doesn't throw any lights yet, Have already driven for about an hour.
Is the pcm in closed loop mode? or not?
Now i'm monitoring fuel consumption to see if it changes.

Greets.

 

[aldive]

Why on Earth would you do that?

Your gas mileage is going to suffer.

 

[2000StreetRod]

shorter life

Not only will your fuel economy suffer as Aldive points out, your engine life will also shorten. The purpose of the EGR is to reduce the production of nitrous oxides which cause pollution. The EGR accomplishes this by reducing the maximum combustion temperature. A beneficial side effect is increased valve, piston and spark plug life. It used to be that engine heads needed valves after about 80,000 miles due to high combustion temperatures. With EGR, engines can go 300,000 miles and still have decent compression. The main disadvantage of EGR is the build up of carbon in the intake system that comes from the recycled exhaust.

If your PCM is functioning correctly capping the EGR valve will result in a detected low flow diagnostic trouble code. See EGR System O&T to learn more about the system that you have disabled.

 

[Explorer Power]

Not only will your fuel economy suffer as Aldive points out, your engine life will also shorten. The purpose of the EGR is to reduce the production of nitrous oxides which cause pollution. The EGR accomplishes this by reducing the maximum combustion temperature. A beneficial side effect is increased valve, piston and spark plug life. It used to be that engine heads needed valves after about 80,000 miles due to high combustion temperatures. With EGR, engines can go 300,000 miles and still have decent compression. The main disadvantage of EGR is the build up of carbon in the intake system that comes from the recycled exhaust.

If your PCM is functioning correctly capping the EGR valve will result in a detected low flow diagnostic trouble code. See EGR System O&T to learn more about the system that you have disabled.

I mainly did this to prevent carbon buildup in the intake.
And to see if it effects performance (have read on a ford truck forum that it would improve throttle response).
I have read your article before i did this. This was a mere experiment to see if it would change something. I think gas milage is suffering already (i actually have liquid propane injection).
Liquid propane injection does cool the head more, as it is -42 degrees centigrade when it is injected.
I do drive on interstate a lot so i think im gonna unplug it again as i don't want to #### the engine up.

The weird part is that i am not getting any lights...
i would have at least expected one...

Also when does the Egr valve open?
I know it is closed during idle and WOT.
Is it also open when acceleration at about 3/4 throttle?
or is it only open during cruising?

 

[2000StreetRod]

Open EGR valve

I don't know the actual TPS value the PCM uses to close the EGR valve. I'll try and research that. I know that I can hear my valve pop closed when letting off the accelerator after accelerating to 25 or 30 mph. At first I thought it was the A/C clutch cycling. Also, the engine has to be warmed before the EGR system is enabled.

I am also concerned about the carbon accumulation resulting from the recycled exhaust. I may experiment with some type of EGR filter in the future.

It takes a few drive cycles before the CEL is illuminated. Also, the CEL is not activated if the intake air temperature is below a specified amount when low EGR flow is detected. I'll try and find that value also.

 

[2000StreetRod]

drive cycles

. . .
It takes a few drive cycles before the CEL is illuminated. Also, the CEL is not activated if the intake air temperature is below a specified amount when low EGR flow is detected. I'll try and find that value also.

The following is from the Ford 2000 MY OBD System Operation Summary:

"Note: EGR normally has large amounts of water vapor that are the result of the engine combustion process. During cold ambient temperatures, under some circumstances, water vapor can freeze in the DPFE sensor, hoses, as well as other components in the EGR system. In order to prevent MIL illumination for temporary freezing, the following logic is used:

If an EGR system malfunction is detected above 32 oF, the EGR system and the EGR monitor is disabled for the current driving cycle. A DTC is stored and the MIL is illuminated if the malfunction has been detected on two consecutive driving cycles.

If an EGR system malfunction is detected below 32 oF, only the EGR system is disabled for the current driving cycle. A DTC is not stored and the I/M readiness status for the EGR monitor will not change. The EGR monitor, however, will continue to operate. If the EGR monitor determined that the malfunction is no longer present (i.e., the ice melts), the EGR system will be enabled and normal system operation will be restored."

 

[Explorer Power]

The following is from the Ford 2000 MY OBD System Operation Summary:

"Note: EGR normally has large amounts of water vapor that are the result of the engine combustion process. During cold ambient temperatures, under some circumstances, water vapor can freeze in the DPFE sensor, hoses, as well as other components in the EGR system. In order to prevent MIL illumination for temporary freezing, the following logic is used:

If an EGR system malfunction is detected above 32 oF, the EGR system and the EGR monitor is disabled for the current driving cycle. A DTC is stored and the MIL is illuminated if the malfunction has been detected on two consecutive driving cycles.

If an EGR system malfunction is detected below 32 oF, only the EGR system is disabled for the current driving cycle. A DTC is not stored and the I/M readiness status for the EGR monitor will not change. The EGR monitor, however, will continue to operate. If the EGR monitor determined that the malfunction is no longer present (i.e., the ice melts), the EGR system will be enabled and normal system operation will be restored."

I have restored the Egr line.
Hmm.. intresting.
It was above 32 degrees fahrenheit (0 degrees centigrade, freezing point)
How long is one driving cycle?
Since i have restored the line, is my ex now the same as it was before i took the line off?

Thanks.

 

[2000StreetRod]

drive cycle

I believe that an engine start, a drive and a subsequent engine shut off constitutes a drive cycle.

Your Explorer should return to normal after reconnecting the vacuum line.

 

[Explorer Power]

Yeah i think it is back to normal..

So why do we do al sorts of mods to get the lowest intake air temprature possible, and then inject super hot exhaust gas into the intake?

 

[2000StreetRod]

why egr?

The exhaust is oxygen depleted (non-combustible) so when it is introduced into the intake manifold and drawn into the cylinder the result is a less combustible mixture. That reduces the maximum combustion temperature in the chamber reducing the formation of polluting nitrous oxide products. It reduces power production which is why EGR is disabled at idle or moderate or greater throttle.

 

[Explorer Power]

Yes so when you hit the throttle the egr valve closes and the intake air temprature wil return to cold again..
But then you still have a hot Egr tube in the middle of the intake..