Should I remove my EGR Valve? 87-93 mustang?

[Mill Creek Mafia]

I've looked around and i didn't really find an answer for this like i thought i would. I know they make block off plates, etc. I don't have any smog stuff, I actually already took it off and made a block plate for it, I just wanted to see if there was any advantage of leaving it hooked up, or if i was maybe wrong to remove it. Thanks. - billy

[Black90gt]

I always take it off...I also make my own block off plate...If you have a cutoff wheel and some decent thickness sheet metal you can make your own Billy....

[Mill Creek Mafia]

yeah I already made one. i need to pick up one of those mil eliminators.

[illdrag]

actualy you should take the sensor part off the valve and plug it in and tuck it behind the intake...if not it will put the computer in "limp mode" at idle

[Gator]

I wish the they would add an EGR delete option on the PMS.. Just about every other chip/tuner allows you to knock it out of the equation. (tweecer/x-cal/diablo)

[Mill Creek Mafia]

actualy you should take the sensor part off the valve and plug it in and tuck it behind the intake...if not it will put the computer in "limp mode" at idle


Mythology Case #3:
EGR deletion w/out deleting its function in the EEC-IV logic, will cause engine pre-detonation (pinging) at part-throttle.

Fact #3:
This is a special case, mainly because it would only be true under the following condition:

-----> EGR gases are blocked from entering the intake, but the EGR valve is set to operate so the EGR Valve Position (EVP) sensor related codes are not registered. No other EGR system related codes registered, and system operational (valve opening/closing portion).<-----

Deletions by:

1. Placing resistors in the EVP connector to simulate closed position EVP value and prevent code 31 (EVP circuit below minimum voltage of 0.24 volts.) from getting logged....but having EVP not opening codes registered (33 & 34).

2. Removal of EGR Valve Regulator (EVR) solenoid, vacuum lines, EGR valve and EVP sensor, thus getting EGR system codes logged in the system...

3. Having an EGR failure code present in the system, IS a way of deleting the EGR function from the system.....

DO NOT cause engine pre-detonation problems due to the EGR delete......Why???????

The EEC-IV logic DOES NOT allow the operation of the EGR system when an EGR failure code is present. Therefore, no timing advance is added by the system, since the EGR function is cancelled/bypassed.

Timing table compensation for EGR operation works as follows:

A. When an EGR code is not registered (EGR Failure Flag=0).
B. Advance degrees added to compensate for EGR opening, are calculated by the EEC-IV based on the actual position change of the EVP sensor...the wider it's opened, and bigger the load, more advance timing is added to the ignition timing table....if the EVP sensor voltage change = 0 from its closed position.....0° advance is the added timing to the tables.

Bottom line....if engine pre-detonation is experienced after an EGR delete, with the only exception mentioned......it's not caused by the EGR being deleted....need to check A/F, total timing advance and combustion chambers for carbon deposits.......etc.

BTW....if you have an EGR code currently set in the system as an On Demand or KOER code....you already have the EGR deleted!

[rel3rd]

To each his own, but I never have figured out why people remove them...

[tstang90]

I'd say it's cause of the clutter they give.....It's my best guess. I kinda wonder how much truth there is in that last post. It sounded like a lot of the problems i had experienced and if it was all due to a EGR delete that would really suck the big one.

[Notch-R]

To each his own, but I never have figured out why people remove them...
exaust gas in the intake track=dirt, FI intakes are for air only!! JK, sorry i could'ent help it,drinking,it's sunday and i don't have to work!!!:shock:

[BRH]

so that explanation has me real confues now, so which is the proper way to do it w/o throwing the car into limp mode or get a cel?

[Quick88Tbird]

Get it dyno-tuned afterwards.