92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
#1
92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
I have a vacuum gauge on the vacuum line to the egr so I know when it turns on and it never does? No CEL. Egr tested good. I got a new cvc and tested good. I tested the egr solenoid and checks good. I swapped ecu no help. I ohm the orange/blue strip wire from egr solenoid to ecu and was good. My question is what sensor or sensors does ecu need to engage the egr solenoid? Maybe I have a bad sensor to the ecu so egr solenoid can't engage? Any thoughts???
Last edited by 83gs1100g; 01-18-2015 at 10:45 PM.
#3
re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
Does anyone know what sensors the ecu requires before it will allow egr to engage?
#4
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re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
There are no sensors that tell egr solenoid to open the egr. Best thing you can do is apply power, or ground to the solenoid. Make sure you unplug it from the original harness though. I don't want you frying the ecu.
#5
re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
Also in my previous post I had mentioned checking the egr solenoid as per the manual and it checked fine. So did the egr valve and the cvc.
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re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
Honda doesn't use EGR like other manufacturers do. It's rarely open. Try cruising around above 3000 RPM (something you never do in a VX). See if that gets it to open.
It wont improve fuel economy if that's what you're looking for. People who measure fuel economy in real time have found that forcing the EGR open hurts MPG.
My VX is over 300k, I haven't gotten around to cleaning up the EGR and intake manifold yet and I'm sure it's never been done. Still no CEL for it. Consistent 45mpg around town without even trying, 49 when I'm driving conscientiously (and that was before I noticed my TPS was damaged and out of adjustment).
It wont improve fuel economy if that's what you're looking for. People who measure fuel economy in real time have found that forcing the EGR open hurts MPG.
My VX is over 300k, I haven't gotten around to cleaning up the EGR and intake manifold yet and I'm sure it's never been done. Still no CEL for it. Consistent 45mpg around town without even trying, 49 when I'm driving conscientiously (and that was before I noticed my TPS was damaged and out of adjustment).
#7
re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
It wont improve fuel economy if that's what you're looking for. People who measure fuel economy in real time have found that forcing the EGR open hurts MPG.
So I'm pretty sure like every car out there the egr only opens when cruising based on sensors telling ecu when its time to open. What sensors? Anyone???
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re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
The ecu tells the egr when to open, it does its own calcuations and tells the egr solenoid when to allow vacuum. Did you put the the vac gauge between the solenoid and the egr?
#9
re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
Yes, I have the vacuum gauge between the solenoid and the egr. It never moves. I have the 12v on the fuse side of egr solenoid. I ohmed the other side to ecu and checks good so according to manual it says swap ecu. I did that and no change. So I was hoping it might be a sensor feeding the ecu like maybe map or tps or what else I don't know that ecu needs to tell egr solenoid to turn on? Thus far I have no cel, new cvc, checked egr, checked egr solenoid and tried another, swapped ecu? So I'm guessing it would be an input sensor that ecu isn't getting?
#11
re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
yes it does. it works fine. im starting to think no one reads my post??? the manual says if u put voltage on it and it works then ohm the org/blue stripe wire to ecu and if thats good then replace ecu. i have done it all and it all works? i know one know what inputs the ecu needs to turn it on?
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re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
So if you swapped ecu's and you still not getting any readings from your vac gauge then its best to say that you have to meet certain driving conditions in order to have the egr activate. For instance you can warm up your car and apply power to the egr and it should start to sound like its ready to die, or so I was told. Also the egr does not take 12v, I think the ecu sends out a 5v to the control solenoid.
#15
re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
So if you swapped ecu's and you still not getting any readings from your vac gauge then its best to say that you have to meet certain driving conditions in order to have the egr activate. For instance you can warm up your car and apply power to the egr and it should start to sound like its ready to die, or so I was told.
Also the egr does not take 12v, I think the ecu sends out a 5v to the control solenoid.
#16
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re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
The egr valve only engages at idle to reduce emissions. The car runs lean at idle and to reduce the hydrocarbon emissions honda had to use an egr valve on its lean burn engines.
Your egr should only operate when the vehicle is cold to help get the car to normal operating temperature.
The egr does not engage during any other cycle for any other purpose
Your egr should only operate when the vehicle is cold to help get the car to normal operating temperature.
The egr does not engage during any other cycle for any other purpose
#17
re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
The egr valve only engages at idle to reduce emissions. The car runs lean at idle and to reduce the hydrocarbon emissions honda had to use an egr valve on its lean burn engines.
Your egr should only operate when the vehicle is cold to help get the car to normal operating temperature.
The egr does not engage during any other cycle for any other purpose
Your egr should only operate when the vehicle is cold to help get the car to normal operating temperature.
The egr does not engage during any other cycle for any other purpose
http://www.agcoauto.com/content/news/p2_articleid/207
Last edited by 83gs1100g; 01-20-2015 at 07:40 AM.
#18
re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
From the link above I found this -
"Electrically operated EGR valves are also common. These may have up to three valves in one unit. The engine computer can open and close any or all the valves in response to input from sensors. For instance the electronic temperature control or ETC sensor informs the computer when the engine is cold. Knock sensor(s) signal valve clatter or detonation. A sensor built into the unit informs the computer of the position of each valve."
This is what I am looking for? Anyone know what inputs the ecu needs to engage the egr solenoid?
"Electrically operated EGR valves are also common. These may have up to three valves in one unit. The engine computer can open and close any or all the valves in response to input from sensors. For instance the electronic temperature control or ETC sensor informs the computer when the engine is cold. Knock sensor(s) signal valve clatter or detonation. A sensor built into the unit informs the computer of the position of each valve."
This is what I am looking for? Anyone know what inputs the ecu needs to engage the egr solenoid?
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re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
The eletrical ones are the newer models. you're using the old style egr, which is a vacuum top. The newer ones don't have a separate egr controller and does not need a vacuum hose. They are also 5 wire egr. Your's, and mine, are 3 wire egr w/ an egr solenoid.
#20
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re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
There are 2 different kinds of egr valves as mentioned.
The egr has nothing to do with lean burn and if you have no check engine light the valve is operating normally.
The egr has nothing to do with lean burn and if you have no check engine light the valve is operating normally.
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re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
If you're trying to figure out lean burn than you ned a wide band a/f ratio gauge. YOu hit that 20:1 thats how you know. You can use the vacuum gauge to help you with your throttle usage.
#22
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re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
How are you testing it with a vacuum gauge? Do you have this gauge run to the inside of the car and are monitoring it?
EGR only opens during deceleration, usually from above 55mph. I've data logged Hondas and very rarely see the EGR opening. The only Hondas I ever see where the EGR will open is on the V6 and it only happens for about 1-2 seconds while decelerating from 55+ mph to 35mpg with no brakes applied.
EGR only opens during deceleration, usually from above 55mph. I've data logged Hondas and very rarely see the EGR opening. The only Hondas I ever see where the EGR will open is on the V6 and it only happens for about 1-2 seconds while decelerating from 55+ mph to 35mpg with no brakes applied.
#23
re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
EGR only opens during deceleration, usually from above 55mph. I've data logged Hondas and very rarely see the EGR opening. The only Hondas I ever see where the EGR will open is on the V6 and it only happens for about 1-2 seconds while decelerating from 55+ mph to 35mpg with no brakes applied.
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re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
The thing is...............what are you trying to gauge by checking the egr to see if its opening?
#25
re: 92 vx egr not engaging - what sensors does ecu need to engage the egr solenoid?
The various sensors the ecu needs the turn the egr solenoid on? From the 92-95 service manual page 11-134 is the drawing I am referring to. It is egr t-shooting section and does not identify the various sensors. If one of the sensors are bad then the egr system won't work.