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Old 12-14-2013, 12:46 PM   #1
Levi05
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EGR and the computer

How does the EGR communicate with the computer to know its working? For example, if I removed the valve from the engine but left it plugged in, would the computer still think its working and not throw a code?


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Old 12-14-2013, 03:09 PM   #2
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No, it would throw a code.
The reason for this is the sensor reads differential pressure.

Let's say that it runs on a 5v scale where that equals closed and 14.7"Hg.
That means on one side there will always be 14.7 (atmospheric pressure) call this A. And the other side we'll call B. Which means in a closed position it'd also read 14.7.
Now if it's open 1/4 of the way side B would be 14.7 * .75 = 11"Hg. And so on for each open point.

There are conditions where the EGR is open and conditions where it is closed. If those conditions aren't met, the car runs a self test to determine if it's a fluke. If the test fails it will throw a code.

So it's not a case where you can just hook up the vacuum lines in a different arrangement and fool the ECU. The open/closed conditions will read identical and the self test will fail.
The system is designed this way so you can't fool it to pass emissions. Older systems you could simply put a blockoff plate between the valve and intake and the PCM would never know the difference. You'd pass the electronic emissions tests but could fail the tail pipe section. This is intended to prevent that. In part because modifying Emissions equipment is a Federal crime in every state regardless of testing.

So basically if you want to disable EGR you have to turn the system off with a custom tune. it is the only way to keep the lamp off.
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Old 12-14-2013, 06:20 PM   #3
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Ok, that's what i was afraid of. Hmm... I believe Tom told me a little while ago that it would fail the OBD2 reddiness (sp?) test if he turned it off in the tune. So that wouldn't help either. I don't mind the EGR because it helps with fuel mileage if is setup properly. It just makes things tricky when installing a header... But the majority of theEGR plumbing is in the head so i could grind out the area between the egr port and exhaust port to have a functioning EGR with a header. Right?
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Old 01-01-2014, 06:23 PM   #4
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Ok, that's what i was afraid of. Hmm... I believe Tom told me a little while ago that it would fail the OBD2 reddiness (sp?) test if he turned it off in the tune. So that wouldn't help either. I don't mind the EGR because it helps with fuel mileage if is setup properly. It just makes things tricky when installing a header... But the majority of theEGR plumbing is in the head so i could grind out the area between the egr port and exhaust port to have a functioning EGR with a header. Right?
On my reflash, I have the egr & rear 02 senser deleted & don't have issues passing emissions w/ a header & cams.
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Old 01-08-2014, 06:40 PM   #5
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How do they do your testing? Do they just check for codes? In Utah, they have a printout with a list of things that are checked on the computer. One of those is egr and it says "ready". i think they would notice if it changed to "n/a" or "off" (if that's an option).
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Old 01-08-2014, 07:14 PM   #6
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No everyone fails but to cover my butt I tell everyone that it will show readiness not complete , it seems to be a 60 fail 40 pass

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Old 01-09-2014, 09:20 PM   #7
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Looking at how they do the testing here, I'm sure i'd fail... I guess swapping some parts and loading the stock tune once a year wouldn't be that bad. ...or i could mod the header and/or head to keep the egr active. Tom, you could tune for that, right?
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Old 01-09-2014, 09:32 PM   #8
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How do they do your testing? Do they just check for codes? In Utah, they have a printout with a list of things that are checked on the computer. One of those is egr and it says "ready". i think they would notice if it changed to "n/a" or "off" (if that's an option).
I do get a print out from the emmisions test station, but never paid attention as I was running over to get my tabs. They do plug into the obd2 connector & then give you a printout. I have a fwerks header & of course have the rear o2 senser turned off & the egr also. A IDS that the Ford techs use, If you what your looking for & at, I can see the egr & rear o2 senser is off as it sends a signal as if they were in place & working.
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Old 01-10-2014, 07:49 AM   #9
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Yes I can tune for that

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