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-   -   do 2004's and 2005's, both with the 5.7L hemi, Use different throttle bodies? (https://dodgeforum.com/forum/3rd-gen-ram-tech/431178-do-2004s-and-2005s-both-with-the-5-7l-hemi-use-different-throttle-bodies.html)

GRNDPNDR Jun 15, 2020 04:40 PM
Does a 2005, 2500, Hemi have an EGR System?
 
Looking at my 04 1500 it has an EGR system, but the same spots on my 05 2500 Hemi have the EGR spots blocked off and there doesn't even appear to be a plug for an EGR valve, so I'm trying to sort out if it's supposed to have an EGR system that someone deleted and cut the plug off, or if it just didn't have one to begin with.

the plugs look pretty old.... about as old as the engine.

Magnoom Jun 15, 2020 10:53 PM
Are you asking about throttle bodies (as your title says) or EGR? Your 2500 didn't come with EGR from the factory, only 1500's did those years.

GRNDPNDR Jun 16, 2020 01:06 PM
Originally Posted by Magnoom (Post 3484129)
Are you asking about throttle bodies (as your title says) or EGR? Your 2500 didn't come with EGR from the factory, only 1500's did those years.
I was asking about the throttle body, but edited and didn't realize that the actual forum topic didn't change.


So does not having an EGR affect anything negatively? I hear both side of the argument that it can increase mpg, and decrease mpg. Why did Dodge decide not to have an EGR on the 2500 Hemis?

HeyYou Jun 16, 2020 07:22 PM
Originally Posted by GRNDPNDR (Post 3484167)
I was asking about the throttle body, but edited and didn't realize that the actual forum topic didn't change.


So does not having an EGR affect anything negatively? I hear both side of the argument that it can increase mpg, and decrease mpg. Why did Dodge decide not to have an EGR on the 2500 Hemis?
Wasn't required by the EPA.

EGR is just Exhaust Gas Recirculation. Run a bit of exhaust back into the combustion chamber to keep cylinder temps down. Reduces NOx production, and allows you to run a bit more timing without pre-ignition. It *might* make a difference in fuel economy, but, on a three quarter ton truck, I doubt it would be enough of a difference for you to notice. :D

Magnoom Jun 17, 2020 12:49 AM
That^^^^
What EGR can do when it screws up is affect driveability. Anyone who swaps to better heads or certain intake manifolds removes the EGR and it gets written out in a custom tune. Oddly enough, no EGR in 03 1500's lol. Only 5.7's in 04-08 1500's and LX's used it. 6.1 did not, 6.4/392 does not, all the 6.2 derivatives do not and the eagle 5.7 does not except for the low production Durango/Aspen hybrids.

HeyYou Jun 17, 2020 07:50 AM
Originally Posted by Magnoom (Post 3484252)
That^^^^
What EGR can do when it screws up is affect driveability. Anyone who swaps to better heads or certain intake manifolds removes the EGR and it gets written out in a custom tune. Oddly enough, no EGR in 03 1500's lol. Only 5.7's in 04-08 1500's and LX's used it. 6.1 did not, 6.4/392 does not, all the 6.2 derivatives do not and the eagle 5.7 does not except for the low production Durango/Aspen hybrids.
On the engines that have VVT, Dodge just adjusted the cam a bit instead of using EGR.

Magnoom Jun 17, 2020 08:50 AM
Originally Posted by HeyYou (Post 3484272)
On the engines that have VVT, Dodge just adjusted the cam a bit instead of using EGR.
Yes I know, VVT gave them that flexibility except for the hybrids; that's why the provision is there for just not drilled through. Also why the eagle head part numers are the way they are, so assembly line workers knew which one went on which side for EGR (normal cases they are side to side interchangeable).


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