EGR Code-should I care?
Thread Starter
Drifting
Joined: Mar 2017
Posts: 1,897
Likes: 164
From: Nashville TN
2017 C4 of Year Finalist
EGR Code-should I care?
Driving today I got the code 32, which I believe is for the EGR valve not opening. No other driveability issues though. With it being cold out, I'm pretty sure that one can wait until spring to fix. Any reason I should worry about it sooner?
Thanks!
Thanks!
8th Gear
Joined: Dec 2011
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egr
[QUOTE=Bfenty;1598441636]Driving today I got the code 32, which I believe is for the EGR valve not opening. No other driveability issues though. With it being cold out, I'm pretty sure that one can wait until spring to fix. Any reason I should worry about it sooner?
my 90 gives that code from time to time...I replaced the egr and from time to time it still gives me that code...The car does not have any running issues and USUALLY once I stop the car restart it the service engine soon light goes and and does not come back on. Since the engine runs just fine...I just leave it alone...
my 90 gives that code from time to time...I replaced the egr and from time to time it still gives me that code...The car does not have any running issues and USUALLY once I stop the car restart it the service engine soon light goes and and does not come back on. Since the engine runs just fine...I just leave it alone...
Team Owner
Joined: Sep 2001
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From: Athens AL
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No, you really shouldn't care unless youre someone who really worries about emissions stuff.
It won't make any real difference in how the engine runs.
It won't make any real difference in how the engine runs.
Thread Starter
Drifting
Joined: Mar 2017
Posts: 1,897
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From: Nashville TN
2017 C4 of Year Finalist
Drifting
Joined: Oct 2015
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From: Shit Creek, USA
One thing I really like about my BlueDriver OBDII interface is the ability to read and clear codes from my iPhone. I had an occasional CEL for the evaporation canister that has since been fixed. I ignored the fix for several months and just wiped the code quickly whenever it popped up.
Of course that's on a '96. Is there some way to rig a remote reset for your '85?
Of course that's on a '96. Is there some way to rig a remote reset for your '85?
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
You could install a 160deg T-stat as the ECM will not call for EGR until >170s and steady driving.
You could also run a diode link between the EGR command line to the sensor on the exhaust tube.
You could also run a diode link between the EGR command line to the sensor on the exhaust tube.
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Thread Starter
Drifting
Joined: Mar 2017
Posts: 1,897
Likes: 164
From: Nashville TN
2017 C4 of Year Finalist
One thing I really like about my BlueDriver OBDII interface is the ability to read and clear codes from my iPhone. I had an occasional CEL for the evaporation canister that has since been fixed. I ignored the fix for several months and just wiped the code quickly whenever it popped up.
Of course that's on a '96. Is there some way to rig a remote reset for your '85?
Of course that's on a '96. Is there some way to rig a remote reset for your '85?
Excuse my ignorance, but what would the diode do for me?
Team Owner
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From: Hartford WI
Pro
Joined: Mar 2007
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From: Mt Prospect IL
2025 C4 of the Year Finalist - Unmodified
Just be careful, EGR reduced combustion chamber temperature for reduced NOx emissions. No EGR will raise combustion temps and could even shorten engine life under hard driving conditions. Had a T/A 400 melt a piston because of an EGR block off. Just be careful.
Thread Starter
Drifting
Joined: Mar 2017
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From: Nashville TN
2017 C4 of Year Finalist
Will it raise engine temps overall or just combustion chamber? I ask because my cooling system is rock solid and overheating isn't an issue for me, but if it were not related to coolant temp then that is different.
I've got another thread about vacuum lines, I might go ahead and replace the EGR valve in addition to vacuum lines at some point in the near future. I assume the valve is pretty cheap and it's not that hard to do.
Team Owner
Joined: Dec 2000
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From: SE NY
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When the ECM calls for EGR the exhaust tube quickly heats up causing the sw on the tube to close, i.e. ground out.
The ECM calls for EGR by grounding one side of the sol., the diode feeds back that signal via the tube sw so the ECM sees the EGR request satisfied, w/o EGR actually being engaged. BTW, to use the diode disconnect the electrical cable from the EGR vac. controller to disable EGR from actually turning on.
I've run a 160deg T-stat in each of my 35th Anni Vettes since 2000 and never had any issues with the ECM staying in open loop. What I did find was ~1mph increase in trap speed over the stock T-stat, equals ~10chp increase.
The ECM calls for EGR by grounding one side of the sol., the diode feeds back that signal via the tube sw so the ECM sees the EGR request satisfied, w/o EGR actually being engaged. BTW, to use the diode disconnect the electrical cable from the EGR vac. controller to disable EGR from actually turning on.
I've run a 160deg T-stat in each of my 35th Anni Vettes since 2000 and never had any issues with the ECM staying in open loop. What I did find was ~1mph increase in trap speed over the stock T-stat, equals ~10chp increase.
Team Owner
Joined: Jul 2004
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From: Hartford WI
When the ECM calls for EGR the exhaust tube quickly heats up causing the sw on the tube to close, i.e. ground out.
The ECM calls for EGR by grounding one side of the sol., the diode feeds back that signal via the tube sw so the ECM sees the EGR request satisfied, w/o EGR actually being engaged. BTW, to use the diode disconnect the electrical cable from the EGR vac. controller to disable EGR from actually turning on.
I've run a 160deg T-stat in each of my 35th Anni Vettes since 2000 and never had any issues with the ECM staying in open loop. What I did find was ~1mph increase in trap speed over the stock T-stat, equals ~10chp increase.
The ECM calls for EGR by grounding one side of the sol., the diode feeds back that signal via the tube sw so the ECM sees the EGR request satisfied, w/o EGR actually being engaged. BTW, to use the diode disconnect the electrical cable from the EGR vac. controller to disable EGR from actually turning on.
I've run a 160deg T-stat in each of my 35th Anni Vettes since 2000 and never had any issues with the ECM staying in open loop. What I did find was ~1mph increase in trap speed over the stock T-stat, equals ~10chp increase.
Team Owner
Joined: Jul 2004
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From: Hartford WI
luckily the light went off and hasn't come back. I think it was probably a fluke.
Will it raise engine temps overall or just combustion chamber? I ask because my cooling system is rock solid and overheating isn't an issue for me, but if it were not related to coolant temp then that is different.
I've got another thread about vacuum lines, I might go ahead and replace the EGR valve in addition to vacuum lines at some point in the near future. I assume the valve is pretty cheap and it's not that hard to do.
Will it raise engine temps overall or just combustion chamber? I ask because my cooling system is rock solid and overheating isn't an issue for me, but if it were not related to coolant temp then that is different.
I've got another thread about vacuum lines, I might go ahead and replace the EGR valve in addition to vacuum lines at some point in the near future. I assume the valve is pretty cheap and it's not that hard to do.
Pro
Joined: Mar 2007
Posts: 595
Likes: 355
From: Mt Prospect IL
2025 C4 of the Year Finalist - Unmodified
Will it raise engine temps overall or just combustion chamber? I ask because my cooling system is rock solid and overheating isn't an issue for me, but if it were not related to coolant temp then that is different.
I've got another thread about vacuum lines, I might go ahead and replace the EGR valve in addition to vacuum lines at some point in the near future. I assume the valve is pretty cheap and it's not that hard to do.
I've got another thread about vacuum lines, I might go ahead and replace the EGR valve in addition to vacuum lines at some point in the near future. I assume the valve is pretty cheap and it's not that hard to do.
Pro
Joined: Mar 2007
Posts: 595
Likes: 355
From: Mt Prospect IL
2025 C4 of the Year Finalist - Unmodified
Once you change the fuel or combustion parts like Intake, Pistons, cam and other internals it changes the dynamics of the combustion process. The OE setup is designed to run as efficiently (read lean) as possible and without EGR this can lead to detonation. If the engine has been modded it allows for full power output, NOx be damned. Rock On and pedal down.
Instructor
Joined: Jan 2015
Posts: 124
Likes: 5
From: Cave Creek arizona
luckily the light went off and hasn't come back. I think it was probably a fluke.
Will it raise engine temps overall or just combustion chamber? I ask because my cooling system is rock solid and overheating isn't an issue for me, but if it were not related to coolant temp then that is different.
I've got another thread about vacuum lines, I might go ahead and replace the EGR valve in addition to vacuum lines at some point in the near future. I assume the valve is pretty cheap and it's not that hard to do.
Will it raise engine temps overall or just combustion chamber? I ask because my cooling system is rock solid and overheating isn't an issue for me, but if it were not related to coolant temp then that is different.
I've got another thread about vacuum lines, I might go ahead and replace the EGR valve in addition to vacuum lines at some point in the near future. I assume the valve is pretty cheap and it's not that hard to do.
Team Owner
Joined: Jul 2004
Posts: 28,431
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From: Hartford WI
Once you change the fuel or combustion parts like Intake, Pistons, cam and other internals it changes the dynamics of the combustion process. The OE setup is designed to run as efficiently (read lean) as possible and without EGR this can lead to detonation. If the engine has been modded it allows for full power output, NOx be damned. Rock On and pedal down.
Advanced
Joined: Oct 2018
Posts: 73
Likes: 1
From: Mesquite, NV
Yes. Fix it! Your combustion chambers will run cooler, your Nox emissions will be lower, O2 sensor readings will be more relevant, knocking/preignition will be guarded against and if you live in a smog test area you at least will not fail for check engine light or Nox. Anything else?