BUILD THREAD EGR

Rams18

Not-quite-so-new-guy
May 12, 2024
8
0
1
67
Augusta, MI
Hi, I have a ‘86 MCSS. I installed a little cam(springs, seals), headers- true dual exhaust, Edelbrock “air gap performer intake, kept the quadrajet. I deleted all the A.I.R. smog stuff. I understand however, that the EGR valve has to stay or it will throw a code. I see that a fellow back a few years made a EGR delete kit are those still available? If not how do I reinstall the EGR on this intake. I see Edelbrock makes an adapter… I don’t see how that works. I kept the vacuum/ electric connections for the EGR and see that the OEM intake just had a port in one of the intake runners… I suppose I could modify that same runner on the air gap performer to except the original EGR or is there an adapter to run into one of the threaded ports? Any ideas? I see online that people are modifying their MCSS ‘s all the time. Thanks. Steve.
 
You can't install EGR on a non EGR intake. Bitflipper sells clones of the ZZ4 PROM chip but you will need to tell him to disable EGR and you will also need a 87 up ECM.
 
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I had an 86 El Camino that I swapped a 355 with the computer controlled carb and distributor. If I remember correct there is no electric computer control going to the EGR just a vacuum line. I had mine on a stock manifold but had made it inoperative with a plugged vacuum line running to it for state inspections at the time. They were more concerned with the true dual exhaust and what a few inspectors thought were hollow converters.
You should not see a code set without the EGR.
 
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I had an 86 El Camino that I swapped a 355 with the computer controlled carb and distributor. If I remember correct there is no electric computer control going to the EGR just a vacuum line. I had mine on a stock manifold but had made it inoperative with a plugged vacuum line running to it for state inspections at the time. They were more concerned with the true dual exhaust and what a few inspectors thought were hollow converters.
You should not see a code set without the EGR.
Ok great. Now I hope I get the rest of this heap together correctly. It’s been 45 years since I tore into a motor…like riding a bike I guess.
 
I had an 86 El Camino that I swapped a 355 with the computer controlled carb and distributor. If I remember correct there is no electric computer control going to the EGR just a vacuum line. I had mine on a stock manifold but had made it inoperative with a plugged vacuum line running to it for state inspections at the time. They were more concerned with the true dual exhaust and what a few inspectors thought were hollow converters.
You should not see a code set without the EGR.
There is a computer controlled solenoid that controls vacuum to the EGR valve. It's mounted on a bracket on the rear passenger side of the intake manifold with the vacuum sensor.
 
If you keep the computer-controlled QJet and HEI and the original PROM, the computer will adjust fueling and ignition on the assumption EGR is working, and it wouldn't be good if it wasn't. So you'd probably want to either take your chances with a rigged PROM that disables EGR, or ditch the computer entirely and install pre-computer QJet and HEI. But either of those approaches assumes you can get away with it in your state, inspection-wise.
 
EGR is and has been a crutch for the OEMs to introduce an inert gas into the combustion process, it is no longer needed with today's engine management systems. I am frankly not sure why anybody would try to keep these archaic emissions systems operating. The lean burn operating systems of the past are just that...the past. Today's EFI systems are so efficient EGR is no longer needed. If you are required in your state to have functioning emission system. I'm sorry for your luck!
 

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