EGR deleate

Reply #15 – September 03, 2008, 04:07:14 PM

Readings from my EGR valve position sensor:

Reference voltage: 5.07v
Total resistance of the sensor pot: 4300 ohms
Signal voltage to signal return(gnd) at KOEO: 1.06v

Current from voltage ref to sig return:
I=E/R, 5.07/4300=.00118 amps

Resistance between sensor signal(pot wiper) and sig rtn(gnd):
R=E/I, 1.06/.00118=847.5 ohms

Resistance between sensor signal and reference voltage:
R=E/I, 4.01/.00118=3398.3 ohms

So you would need two resistors, an 850 ohm and a 3400 ohm.
Hook the resistors in series with the 3400 ohms to the 5v and the 850 ohm to sig rtn(gnd). Sensor signal hooks between the resistors.

This would prevent KOEO codes but you still would get KOER codes.

My sensor signal goes up to 1.56 volts running KOER tests. I don't know if that's the max under running conditions or not.
Since CEL only happens when running. maybe redoing the math with the higher signal voltage would prevent a CEL.
Of course you would have to live with a KOEO code.

EGR deleate

Reply #16 – September 03, 2008, 09:40:05 PM

Quote from: kendoo130;234629

Excuse me if I'm wrong-but aren't 83 mustang gt's carbed with no computer?

For 1982 & 1983 there was a 2.3 Turbo option on the Mustang GT

Brent
:cougarsmily:

EGR deleate

Reply #17 – September 03, 2008, 10:47:38 PM

Quote from: TurboCoupe50;234634

So what's it hurting??? I may run a off road pipe, but the EGR still functions...

Quote from: thunderjet302;234648

The EGR is the only emissions component left on my T-bird. It helps with part throttle fuel economy and doesn't hurt performance so I left it on. It's off at WOT so it's not hurting anything. Really I don't know why someone would want to disconect it....

Ditto and ditto.

EGR deleate

Reply #18 – September 04, 2008, 12:08:48 AM

Quote from: softtouch;234775

So you would need two resistors, an 850 ohm and a 3400 ohm.

Those values are both odd values, when dealing with general replacement resistors... A 3300 is common and should be OK, closest to a 850 would be 820... If it gives a problem would be easy enough to add a 27 ohm in series with it... In precision 1% tolerance resistors, there should be close values avail, but you ain't gonna find them at Radio Shack...

EGR deleate

Reply #19 – September 04, 2008, 12:37:14 AM

Quote from: TurboCoupe50;234875

Those values are both odd values, when dealing with general replacement resistors... A 3300 is common and should be OK, closest to a 850 would be 820... If it gives a problem would be easy enough to add a 27 ohm in series with it... In precision 1% tolerance resistors, there should be close values avail, but you ain't gonna find them at Radio Shack...

I suppose you could find a pot with a similar total resistance and just set it to what ever works.

EGR deleate

Reply #20 – September 04, 2008, 08:34:43 AM

Quote from: softtouch;234880

I suppose you could find a pot with a similar total resistance and just set it to what ever works.

Yup probably the best idea, a common 5K pot would likely be fine... Just set the signal return voltage and forget it... I'm still thinking it will trip the CEL when the EEC doesn't see a voltage change at cruse speeds... Mine works fine, ain't going to mess with it...

EGR deleate

Reply #21 – September 04, 2008, 10:43:22 AM

Quote from: BCA;234850

For 1982 & 1983 there was a 2.3 Turbo option on the Mustang GT

Brent
:cougarsmily:

That was Canada only. I wouldn't mind having one......
Bigger fish to fry though

EGR deleate

Reply #22 – September 13, 2008, 08:52:30 PM

Quote from: V8Demon;234914

That was Canada only. I wouldn't mind having one......
Bigger fish to fry though ;)

That is true, in Canada the 2.3 Turbo engine was optional engine on the Mustang GT.
Here in the states, it was marketed as a separate model called the Turbo GT.
Pretty neat car, but personally I would much rather have an '84 Capri Turbo RS. :D

Brent

EGR deleate

Reply #23 – September 14, 2008, 01:27:07 PM

Quote

Here in the states, it was marketed as a separate model called the Turbo GT.

I was unaware of that. Thought that the first U.S. 2.3t Mustang was '84.....

EGR deleate

Reply #24 – September 15, 2008, 06:37:38 PM

There is a benefit to EGR. It lowers the combustion chamber temperatures and reduces pinging which can be a problem with high temps and aluminum heads.

EGR deleate

Reply #25 – September 20, 2008, 10:52:20 AM

Not sure if this is what your looking for, but I've used this at the EGR position sensor to eliminate annoying codes on a couple of my modded Mustangs, so it should work for us.

EGR deleate

Reply #26 – September 20, 2008, 08:50:52 PM

Quote from: Privateer;236785

Not sure if this is what your looking for, but I've used this at the EGR position sensor to eliminate annoying codes on a couple of my modded Mustangs, so it should work for us.

What does the resister between VREF and EVP do for you? I can't see where it would have any affect on the SIG RTN voltage.

EGR deleate

Reply #27 – September 20, 2008, 10:59:32 PM

Quote from: softtouch;236821

What does the resister between VREF and EVP do for you? I can't see where it would have any affect on the SIG RTN voltage.

I doesn't, but it more than doubles the amount of current drawn by the circuit(VREF & EVP)... Looks as some one designed the circuit that didn't really know what he was doing...

EGR deleate

Reply #28 – September 21, 2008, 10:32:42 AM

Well they may not of known what they were doing... but it kept the computer happy and didn't hurt any electrical circuit for over 2 years. There's probably a more efficient way, so let us know.

EGR deleate

Reply #29 – September 21, 2008, 08:22:11 PM

Quote from: Privateer;236856

Well they may not of known what they were doing... but it kept the computer happy and didn't hurt any electrical circuit for over 2 years. There's probably a more efficient way, so let us know.

I have no doubt that it works. I thought maybe you were the circuit designer and could teach me something.