EGR Delete Help
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Joined: May 2012
Posts: 39
EGR Delete Help
I got rid of my EGR components on my LT1 but am just wondering what I do with this last thing. It's the EGR solenoid. Do I still need this solenoid to plug the sensor into? And what about the two hoses coming off of it? The one I know I don't need since it's going to the EGR valve, but the other says it's a vacuum feed. What is this and will I need it? Thank you very much guys.
http://shbox.com/1/egr1.jpg
http://shbox.com/1/egr1.jpg
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Re: EGR Delete Help
The EGR valve is operated by vacuum - vacuum opens up the valve. The vacuum is "off" when the solenoid is closed (there is no "sensor" involved). To operate the the EGR valve the PCM pulses the solenoid to provide a controlled vacuum level. Low pulse rate opens the EGR valve a small amount, high pulse rates causes the valve to open more.
Since you have deleted the EGR valve, there is no use for the EGR vacuum solenoid or the vacuum lines. All can be removed, and a small vacuum cap added to the nipple on the intake manifold.
But..... when you unhook the harness connector from the EGR vacuum solenoid, the PCM will set code DTC 27 (appears you have a 94 - why not add a "signature"?) for the incomplete electrical circuit. And since you have no EGR flow at any time, the PCM may also set DTC 32 for lack of flow. You have to have these codes programmed out of the PCM or you will be staring at an SES light.
Just curious - why did you delete EGR? If you have emissions check, you may have a problem with NOx. And you have eliminated a system that can actually prevent detonation (knock) when lugging the engine at low RPM. There is no performance gain, since the EGR system does not operate at WOT or above 3,500 RPM.
Since you have deleted the EGR valve, there is no use for the EGR vacuum solenoid or the vacuum lines. All can be removed, and a small vacuum cap added to the nipple on the intake manifold.
But..... when you unhook the harness connector from the EGR vacuum solenoid, the PCM will set code DTC 27 (appears you have a 94 - why not add a "signature"?) for the incomplete electrical circuit. And since you have no EGR flow at any time, the PCM may also set DTC 32 for lack of flow. You have to have these codes programmed out of the PCM or you will be staring at an SES light.
Just curious - why did you delete EGR? If you have emissions check, you may have a problem with NOx. And you have eliminated a system that can actually prevent detonation (knock) when lugging the engine at low RPM. There is no performance gain, since the EGR system does not operate at WOT or above 3,500 RPM.
Thread Starter
Registered User
Joined: May 2012
Posts: 39
Re: EGR Delete Help
The EGR valve is operated by vacuum - vacuum opens up the valve. The vacuum is "off" when the solenoid is closed (there is no "sensor" involved). To operate the the EGR valve the PCM pulses the solenoid to provide a controlled vacuum level. Low pulse rate opens the EGR valve a small amount, high pulse rates causes the valve to open more.
Since you have deleted the EGR valve, there is no use for the EGR vacuum solenoid or the vacuum lines. All can be removed, and a small vacuum cap added to the nipple on the intake manifold.
But..... when you unhook the harness connector from the EGR vacuum solenoid, the PCM will set code DTC 27 (appears you have a 94 - why not add a "signature"?) for the incomplete electrical circuit. And since you have no EGR flow at any time, the PCM may also set DTC 32 for lack of flow. You have to have these codes programmed out of the PCM or you will be staring at an SES light.
Just curious - why did you delete EGR? If you have emissions check, you may have a problem with NOx. And you have eliminated a system that can actually prevent detonation (knock) when lugging the engine at low RPM. There is no performance gain, since the EGR system does not operate at WOT or above 3,500 RPM.
Since you have deleted the EGR valve, there is no use for the EGR vacuum solenoid or the vacuum lines. All can be removed, and a small vacuum cap added to the nipple on the intake manifold.
But..... when you unhook the harness connector from the EGR vacuum solenoid, the PCM will set code DTC 27 (appears you have a 94 - why not add a "signature"?) for the incomplete electrical circuit. And since you have no EGR flow at any time, the PCM may also set DTC 32 for lack of flow. You have to have these codes programmed out of the PCM or you will be staring at an SES light.
Just curious - why did you delete EGR? If you have emissions check, you may have a problem with NOx. And you have eliminated a system that can actually prevent detonation (knock) when lugging the engine at low RPM. There is no performance gain, since the EGR system does not operate at WOT or above 3,500 RPM.
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