I'm going to be wiring up the 90' EFI 460 I just swapped into my rig and I want to trash the EGR valve.

Is this going to upset the computer?? If so is there a way around it?

Depending on what year truck you are putting it into, who cares??
A 90' 460 should have an EGR postion sensor, and a temp sensor. If you plug off the EGR passage then you will set a check engine light, assumeing of cousre that you wired one in.:D
It will not, however, effect how the engine runs. My buddy just swapped a 5.0L into a 68EB and asked me the same question, I have been trying to find the proper wiring diagram at work to wire around the EGR circut, but have been unsuccesful. When I figure out a way I will let you know.:D

Did I answer the question? or just ramble for 5 min???:D

Brian--

By the way, contray to popular gossip. A properly funtioning EGR circuit will not in any way effect the way an engine runs. If anything it will help stop detenation(pinging), and inprove mileage.

Had to throw in some Smog B.S. before I left.:flipoff2:

Brian--

cool, that's was I was hoping for. the check engine light won't be a prob....it doens't have to smog.

I wouldn't bother.

The EEC shuts the EGR at WOT, idle, and cold start conditions anyway.

The injector pulses and ignition timing are calculated for EGR operation at part-throttle.

So all you stand to benefit is the potential of knocking, reduced power output at part throttle, and wasted fuel. And since the 460 doesn't have a knock sensor, the EEC can't compensate with the timing like it can with the 302.

so has anyone that's eliminated the egr valve on an EEC-IV setup noticed adn ill performance effects??

It's gonna be a real pain in the ass to get it all hooked up with the headers I have to run, so I 'd rather junk it

Ok, I'll offer first-hand experience. To start, I run an OEM EFI '89 460 in my Bronco which I swapped in last summer. What I did was I screwed a pipe plug in the EGR port on my header and capped off the port on the EGR valve and left the valve/EGR sensor bolted up and plugged in as stock. Basically this eliminates the EGR hose but allows the ECM to think the EGR valve is still functioning as usual. I have not received any error codes and the engine runs just fine. I can't comment on the fuel mileage as I did this mod when I swapped in the engine so I had no previous MPG to go on.

Thanks, thats exactly what I was looking for.....I'm gonna do the exaqct same thing

I wouldn't take motor building advice from anybody who said they couldn't tell a performance difference between their new 460 and their old 302. :rolleyes:

:D :D

:flipoff2: I can too tell a difference! The 460 sucks down twice as much gas! Truthfully I do think there is a problem with my 460 but not quite sure what yet. I'll figure it out someday :cool:

Originally posted by Dustball
Ok, I'll offer first-hand experience. To start, I run an OEM EFI '89 460 in my Bronco which I swapped in last summer. What I did was I screwed a pipe plug in the EGR port on my header and capped off the port on the EGR valve and left the valve/EGR sensor bolted up and plugged in as stock. Basically this eliminates the EGR hose but allows the ECM to think the EGR valve is still functioning as usual. I have not received any error codes and the engine runs just fine. I can't comment on the fuel mileage as I did this mod when I swapped in the engine so I had no previous MPG to go on.

Why in the world would you do this??

The EGR does not hinder performance in ANY WAY. The ECM shuts it during wide open throttle and high engine loads.

All the EGR does is lower combustion temps and increase fuel efficiency. You will, if anything, notice a decrease in power at part throttle because the ECM is leaning the A/F mixture because it thinks the EGR is functioning.

I can see why you'd remove an EGR for clearance or other issues, but to plug a fuinctioning EGR is just ignorance. You don't understand what its there for. Its not just for smog, its a vital part of the EFI system.

EGR does not effect top-end power, as it closes at WOT anyhow.

Functioning EGR will save you some gas in part-throttle conditions
(like highway cruising). It lowers manifold vacuum, so reduces pumping losses. With a 460, this could be welcome.

Not sure if there ever was a SD '460. A MAF system will probably compensate for disabled EGR fine, but SD (EEC-IV) system on my 2.9 pings at mid-throttle (due to lean mixture) if it is disabled.

We are conditioned to think that if something improves emissions, it must hurt performance. This is not the case with EGR, and it saves gas to boot.

Originally posted by CPMaverick


Why in the world would you do this??


I can see why you'd remove an EGR for clearance or other issues, but to plug a fuinctioning EGR is just ignorance. You don't understand what its there for. Its not just for smog, its a vital part of the EFI system.

That's exactly right- it was clearance issues. I have aftermarket long-tube headers and I just plain could not get the metal tube to line up correctly. I have searched for a compatible flexible tube replacement with no luck.

I have found that, in fact, I do not run lean but actually a bit rich. I'd take a rich situation over lean anytime.

Originally posted by Kevbo
EGR does not effect top-end power, as it closes at WOT anyhow.

Functioning EGR will save you some gas in part-throttle conditions
(like highway cruising). It lowers manifold vacuum, so reduces pumping losses. With a 460, this could be welcome.

Not sure if there ever was a SD '460. A MAF system will probably compensate for disabled EGR fine, but SD (EEC-IV) system on my 2.9 pings at mid-throttle (due to lean mixture) if it is disabled.

We are conditioned to think that if something improves emissions, it must hurt performance. This is not the case with EGR, and it saves gas to boot.

Most if not all OBD-I 460's were SD...I've heard that 95 CA emission 460's were MAF, but I've never seen one.