Need help identifying an engine part

7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
7,388
3,091
194
Kearney, NE
To each his own
I will not be running an EGR valve on mine
Any EGR at anytime is a power loss
Your info is simply not accurate.
See post #3 in the linked thread for the low down from jrichker.
“The EGR shuts off at Wide Open Throttle (WOT), so it has minimal effect on performance.”

Or there are other places that say the same.
“The EGR valve is normally closed. There is no EGR flow when the engine is cold, at idle, or during hard acceleration. The EGR flow is at its peak during steady cruising under moderate load.”

Now if you want to take it off for some weight and tune without it for a max race effort, that’s understandable. I think everything missing that was throwing codes and irritating the stock computer on my car when I saved it from the track, both smog and EGR, weighs about 8 lbs, not including the cats.
 
  • Sponsors (?)


COramprat

...I can take it. I think.
Mod Dude
Mar 2, 2003
8,302
1,483
223
Sea of Tranquility
On the subject of EGR valves my car asks "WTH is an EGR valve?" :rlaugh:
 

Attachments

  • IMG_20220101_184449977.jpg
    IMG_20220101_184449977.jpg
    568.2 KB · Views: 36

Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
39,707
15,488
224
Massachusetts
Here’s the actual EGR strategy from the A9x as written by Ford. We will ignore the “confidential and proprietary” statement and don’t ask questions ;)

This section is 30 or so pages long so I just snapped the most relevant. As you can see, throttle condition is one of the criteria.

15617569-3D81-49F6-805C-ADA05B150CEA.jpeg


APT of part throttle is 0. Idle would be -1 and 1 is WOT. (This is explained on a different page) The only allowable condition to allow the EGR to function is part throttle, otherwise the system self-disables until the 0 condition is met.

More importantly, LOAD is a bigger part of the equation as to when the EGR is functioning. Even at part throttle, as the engine loads up (like going up a hill) the egr is commanded to disable. It would take 5 pages to show this.

In other words, when you need power it shuts off.

Also, just to add. If the EGR is disabled on the A9x, it also disabled “decel fuel shutoff” and “manual trans shift fuel shutoff” from the programming as well.

This doc is almost 600 pages of ECU function.
 
Last edited:
  • Useful
Reactions: 1 user

Bullitt347

I have been doing it wrong this whole time
15 Year Member
Mar 23, 2007
2,820
1,772
184
Middle of Maine
A lot of misconceptions of how "most" emissions system works. A properly operating EGR system does not hurt HP at any time, except for this caveat: If the EGR system makes the cylinder heads or Intake manifold less efficient, then yes, it can hurt HP. But usually never at PT.
 

Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
39,707
15,488
224
Massachusetts
I’m still curious what this part is. I’ve spent a good hour down the Google rathole. My 1986 EVTM is quiet on the 3.8L with regards to this.

I’ll have to check my chiltons. I always felt it was better with the early cars.
 
  • Like
Reactions: 1 users

Wayne Waldrep

Before I post a pic, do you have one of yours?
15 Year Member
Apr 14, 2003
1,270
692
143
56
Cuba, AL
I’m still curious what this part is. I’ve spent a good hour down the Google rathole. My 1986 EVTM is quiet on the 3.8L with regards to this.

I’ll have to check my chiltons. I always felt it was better with the early cars.
Lol....i did the same. Not much info on the 3.8L.
 

Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
39,707
15,488
224
Massachusetts
It’s labeled as an “exhaust heat control valve”

However I can’t find any additional reference to it.

This is out of my Haynes manual for the 1986 3.8

54B9E0D0-3698-4127-868A-9971EB515514.jpeg
 
Last edited: