Why you need to do an EGR delete
^^^^^^^^^^^^^^^^
A reason we thought of recently to consider an EGR delete stems from design of flow for the system. All of the exhaust flows right at the idle motor. Much like the DSMs that are known for killing idle motors, the Evos are starting to do it as well. This is in part because the EGR is pointed right at it. It also puts a lot of carbon in the throttle body and can cause sticking issues.
.
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
Joined: Mar 2003
Posts: 394
Likes: 7
From: Used to be in Nor Cal, now working in Seoul
Did EGR removal after reading this.
I disabled EGR a few years ago thanks to mrfred/tephra rom modifications, but to my surprise, two of EGR vacuum hoses were already disconnected.
After removal/block/capping vacuum ports, gained ~0.4 AFR, so had to touch the map to compensate the AFR change.
Highly recommended mod for older EVOs (purchased June 03), and thanks for the bringing this up, JohnBradley.
I disabled EGR a few years ago thanks to mrfred/tephra rom modifications, but to my surprise, two of EGR vacuum hoses were already disconnected.
After removal/block/capping vacuum ports, gained ~0.4 AFR, so had to touch the map to compensate the AFR change.
Highly recommended mod for older EVOs (purchased June 03), and thanks for the bringing this up, JohnBradley.
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
Really exact age of the car seems less important than overall mileage. Any Evo with more than 75k should consider this to either fix weird issues, possible idle problems, and at the very least prevent possible issues from arising when the EGR does start to bypass more.
Joined: Mar 2003
Posts: 394
Likes: 7
From: Used to be in Nor Cal, now working in Seoul
Really exact age of the car seems less important than overall mileage. Any Evo with more than 75k should consider this to either fix weird issues, possible idle problems, and at the very least prevent possible issues from arising when the EGR does start to bypass more.
Anyway, highly recommended mod!Thanks!
Newbie
Joined: Dec 2014
Posts: 10
Likes: 0
From: lexington, nc
i just did the EGR delete (capped hoses and made block off plate) and now when i put it in neutral and roll up to a stop my car idle freaks out and will idle up and down a few times before the car cuts off.
Evolved Member
Joined: Mar 2010
Posts: 1,532
Likes: 6
From: chicago,il
My friend , it's not that simple your tuner needs to tweak your ecu to make it work properly.