I know this has been posted time and time again and I'm pretty sure I have read every single post on here, supra forums, and my.is. No one ever posted a clear explanation of how to actually delete the EGR system without throwing a code or having idle issues so I'm making one more post on here to see if anyone has the knowledge on how to do that. If not, I'm going to try to research the system and make a DIY for anyone that wants to do it in the future, but if anyone knows what has to be done with the delete in order to have no issues please help me out. Thanks guys

 

My 04 GS300 does not use a EGR valve. What year and engine size are you referring to?

My Supra has the EGR deleted with two block off plates but I ditched the factory engine computer and I run a custom tune and standalone. The EGR valve helps keep combustion temps down at cruising speeds on the factory computer.

 

Let's start with... why?

Anyway... the EFI system opens/closes the EGR valve, then monitors if the EGR valve is open/closed when expected to be, for air/fuel mixture. If you remove the EGR from the EFI system, you either have to remove the EGR coding from the EFI system, or "trick" the EFI to think that the EGR is behaving normally, so the air/fuel mixture is correct.

I'll step back from the former option.. that's getting in to ECU coding hacks. Per the later, when the EGR is open, more metered air is entering the system... correct? So if you want to remove the EGR, when the EGR is told to be open, you'd have to introduce equivalent air somewhere in the intake path, such as another air valve... the air/fuel mixture will change, and you have to compensate for that.

It's doable, yet this is getting complicated.

 

I mostly wanted to do it for engine bay cleanup, from what I've read the whole system has lots on vacuum lines that you can clear out and make the engine bay look a little nicer. You are right about the unmetered air, I wonder if that's where most people are getting their idle problems.

 

Our cars with VVT-i do not have EGR valves...
End of story.

 

Thanks thats the answer I was looking for

 

When a Camry 5S EGR sticks open, the un-metered air causes such a lean condition, that the car is almost un-drivable. Not a bad idle or reduced performance... almost un-drivable.