EGR recall modifaction, can I do without it?

I'm working on getting my 87 back on the road, and most if not all the vacuum lines are broken and rotted. I'm reworking the egr now and want to return to factory. What was the reason of the recall and would I hurt the engine / pcm tune if I was to return the egr to as left the plant specs?

This article briefly describes the EGR recall. The "Delay" valve is green and black plastic as seen in the pictures.

This article briefly describes the EGR recall. The "Delay" valve is green and black plastic as seen in the pictures.

http://turbotbird.com/faqs/#EGR Recall Info:

Thanks Brian.

Sorry to dig this thread up. Im kind of doing the same as the original poster.

Just wondering if anyone has a part number or is willing to try and read the number on the delay valve?

Ive been able to find 2 different numbers for a green/black delay valve but have no Idea which one is correct.

John

On the black side is "CARB" and in small letters "4C5" and also the "FORD" script within the logo.

On the green side is the word "DIST" and the number "E3AE-KA"

Thanks Pete

It turns out to be an old Spark Delay Valve. Apparently these are color coded for time and direction. Unfortunately the "KA" makes this impossible to find. Is it possible its "HA"? I can find the Black/Green E3AE-12091-HA valve which became E3AZ-12091-H then DY-420. Im not sure if its the same because the pictures ive seen of this valve in the recall almost look florescent green like the 42lb injectors. The DY-420 I found looks more like a deep green and the ports appear to be two different sizes.

John

John

All it does is set a EGR code that the sticker(if present)says to ignore... I just always tossed them...

I believe it only sets the code because the EGR wont open with the delay valve until you get into steady state cruise.

From my understanding the reason they replaced the catalytic converters and installed this valve was because the cats were failing/ clogging, causing increased backpressure forcing excessive cycling of the EGR along with poor drivability. The valve was put in to keep the EGR from being active everytime you hit the throttle to get rid of bogging, hesitation and poor cold drivability. I know mine will open easily with free reving but left disconnected I get light throttle pinging.

What I don't understand is why it sets the code since the EGR is not dynamic and there's no feedback. Maybe im mistaken but I think the computer just triggers the solenoid and doesn't know if the EGR is actually opening. I guess I should plug the vac line and run codes to see if the code pops up.

TurboCoupe50....... if you have one laying around Id be happy to take it off your hands.

John

It only triggers a code during the KOER self test, it won't trigger a code or turn on the CEL in normal driving. During KOER, the PCM opens the EGR valve, and the PCM looks for a change in the O2 sensor reading. If it doesn't see the change in the O2 output in a short time, a EGR code is set.