EGR question "diode trick"
Thread Starter
Racer
Joined: May 2002
Posts: 266
Likes: 0
EGR question "diode trick"
Hi everybody!
i have a question about the EGR disable,i took out the EGR valve,and leave the solenoid connected,i did it when i installed the Superram and headers,but seems like my car is not idle right it is unstable sometimes,and feels heavy when i hit the throttle
,i checked for leaks and everything seems to be ok,maybe the reazon is that egr problem i have not a reprogramed chip,but i heard about a diode trick for the solenoid,is that a good mod for that????
anyone has the link???
Thx!
i have a question about the EGR disable,i took out the EGR valve,and leave the solenoid connected,i did it when i installed the Superram and headers,but seems like my car is not idle right it is unstable sometimes,and feels heavy when i hit the throttle
,i checked for leaks and everything seems to be ok,maybe the reazon is that egr problem i have not a reprogramed chip,but i heard about a diode trick for the solenoid,is that a good mod for that????anyone has the link???
Thx!
Race Director
Joined: Jun 2004
Posts: 13,939
Likes: 705
From: WI
With the valve removed, it cannot be doing anything. On my car I cut the wires and tied them back, you do not need them hooked up. The diode trick would not do anything as far as I know, since with mine disconnected it does not get codes. 65ZO1 has the diode information on his site here: http://www.geocities.com/jgkov/index.html
Thread Starter
Racer
Joined: May 2002
Posts: 266
Likes: 0
With the valve removed, it cannot be doing anything. On my car I cut the wires and tied them back, you do not need them hooked up. The diode trick would not do anything as far as I know, since with mine disconnected it does not get codes. 65ZO1 has the diode information on his site here: http://www.geocities.com/jgkov/index.html
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
egr
1.if I unplug my egr solenoid, I get a code.
2.If I disconnect the egr sensor, I get a code.
3.I am guessing, that if you ohm the egr solenoid coil, and solder a resistor of that value to the egr connector pins, and use a hose clamp, clamp the egr sensor to the exhaust manifold, it would not throw a code.
2.If I disconnect the egr sensor, I get a code.
3.I am guessing, that if you ohm the egr solenoid coil, and solder a resistor of that value to the egr connector pins, and use a hose clamp, clamp the egr sensor to the exhaust manifold, it would not throw a code.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
diode
diodes are one-way electrical gate valves. They only pass electricity in one direction.
a diode isn't what you need, shat you need is a resistor.
the computer is resistance based. If you replace the egr solenoid with a resistor, you can fool it into thinking that the egr solenoid is still connected.
a diode isn't what you need, shat you need is a resistor.
the computer is resistance based. If you replace the egr solenoid with a resistor, you can fool it into thinking that the egr solenoid is still connected.
Thread Starter
Racer
Joined: May 2002
Posts: 266
Likes: 0
diodes are one-way electrical gate valves. They only pass electricity in one direction.
a diode isn't what you need, shat you need is a resistor.
the computer is resistance based. If you replace the egr solenoid with a resistor, you can fool it into thinking that the egr solenoid is still connected.
a diode isn't what you need, shat you need is a resistor.
the computer is resistance based. If you replace the egr solenoid with a resistor, you can fool it into thinking that the egr solenoid is still connected.
does the car runs better with the resistance instead the EGR solenoid??
i mean just the solenoid without hoses and egr valve??or the solenoid does the same function???
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
egr
the solenoid is a vacuum switching valve run by the computer.
the Egr adds exhaust to the intake to assist in filling the cylinders with a volume of unburnable gasses that your engine actually generates as a product of combustion.
When you fill the cylinders with this gas, and the air, and the fuel, you need less fuel to burn the air that's been diluted with a gas that doesn't burn. The end result is less detonation on cheaper gas, and the power output is about the same because compression is all about compressing the mixture of air and fuel into a specific volume to intensify the explosion that pushes the piston back down the cylinder..if that volume doesn't change, the explosion is obtained with less actual fuel and less emissions.
the Egr adds exhaust to the intake to assist in filling the cylinders with a volume of unburnable gasses that your engine actually generates as a product of combustion.
When you fill the cylinders with this gas, and the air, and the fuel, you need less fuel to burn the air that's been diluted with a gas that doesn't burn. The end result is less detonation on cheaper gas, and the power output is about the same because compression is all about compressing the mixture of air and fuel into a specific volume to intensify the explosion that pushes the piston back down the cylinder..if that volume doesn't change, the explosion is obtained with less actual fuel and less emissions.
Last edited by coupeguy2001; Jul 31, 2007 at 05:24 PM.
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Drifting
Joined: Feb 2006
Posts: 1,423
Likes: 96
From: Magnolia Tx
Not to argue here, but the diode is being used as a switch. If done right, it will pull the egr temp switch lead to ground when the soleniod pulls in. That is the feed-back the ecm is looking for. The egr switch has to change states when commanded or you get a code32.
Benny
Benny
Thread Starter
Racer
Joined: May 2002
Posts: 266
Likes: 0
Not to argue here, but the diode is being used as a switch. If done right, it will pull the egr temp switch lead to ground when the soleniod pulls in. That is the feed-back the ecm is looking for. The egr switch has to change states when commanded or you get a code32.
Benny
Benny
cause the solenoid is not reading the pressures without the valve and maybe the values are low and the readings help to the fuel mix at idle,what you guys think about it??
And thanks a lot for the quick answers!!
