smog pump delete
Junior User
Joined: Jan 2007
Posts: 52
Likes: 0
From: Middle of Ohio
im pretty sure its my knock sensor that is retarding my timing and making ny truck lose horsepower because when i take off in first and get going and the shift it into second its lame but when the rpms hit 2000 and up it will put you back in the seat. you can actually feel it and i dont know why its doing that
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
That's just the 302's powerband. My truck is the same way, starts to make decent power above 2000 rpm. You can unplug it if you want, just to see if there is any difference, but I don't think there is any way to just bypass it entirely (probably not a good idea either if it still works and is keeping the engine from pinging).
Freshman User
Joined: Jul 2008
Posts: 42
Likes: 0
From: NC
Good thread, I've got an 88 F250 460, I'm doing research in order to remove all the smog crap, I've already made my cat "Free Flow" 
I'm in the process of getting all the air lines disconnected from the manifolds, after that all the other hoses and egr is coming off..
I'm in the process of getting all the air lines disconnected from the manifolds, after that all the other hoses and egr is coming off..
Freshman User
Joined: Jul 2008
Posts: 42
Likes: 0
From: NC
Well I removed all the smog crap from my 460, I gained about 2mpg.. I still need to measure and get the correct size belt so I can remove the smog pump, there's nothing hooked to it but I'd like to remove it... Does anyone have a part # for the correct size belt??? The truck runs great...
Also I removed the EGR and as suggested in post # 21 I installed the Original EGR Eliminator $20.00 from http://rjminjectiontech.com/?p=9 ... Worked as described no CEL
Also I removed the EGR and as suggested in post # 21 I installed the Original EGR Eliminator $20.00 from http://rjminjectiontech.com/?p=9 ... Worked as described no CEL
Senior User
Joined: Jul 2010
Posts: 156
Likes: 0
From: Wasilla Alaska
good thread...im about to do the same thing to my 91 250 with 5.8. anybody got any pics? just put a big red "X" on all the crap that i can throw in the garbage. lol. im just about to yank everything attached to that pump and all related stuff.
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
Removing the smog pump will gain you nothing and could lead to a lean condition. I know this first hand, i took out mine some months ago because of the lack of spare parts (can't find a replacement thermactor in Venezuela), and there were absolutely no gains, neither in mileage nor power. The result could be different on other engines, mine's a 302.
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Freshman User
Joined: Jul 2008
Posts: 42
Likes: 0
From: NC
Just to make sure you know what your getting into be prepaired to remove your exhaust manifolds so you can plug/weld the air tube holes mine were located on the fire wall side of the manifold... The main reason I did mine I was removing the exhaust manifolds to replace my gaskets and I broke a couple of the air tube fittings, but I ended up getting better gas mileage and I can actually SEE my engine now.... So I'm very pleased...
Freshman User
Joined: Jul 2008
Posts: 42
Likes: 0
From: NC
It's an air pump driven buy a fan belt, it part of the emissions system on your engine... It injects air into the exhaust system...
New User
Joined: Aug 2010
Posts: 1
Likes: 0
smog pump delete
I have a 93 f150 that originally had a 302 with a 5 speed that i swapped for a 5.8. when i first did it, i wasnt happy with the power (not much more than the 5.0) and worse mileage (about 13) i ttook off my smog pump and gutted the cat. and gained tons of power and mileage. it now gets about 17 to the gallon, and has more power than my other truck that has the 460, which is now getting the smog pump delete on it. i found in a junkyard a bracket and pulley to go in place of the pump. also, on the back of the heads i just tapped pout the holes and bought plugs to fit in. very happy with how the truck has ran since
Elder User
Joined: Apr 2008
Posts: 841
Likes: 1
From: North Carolina
been a lil while since a post in this thread, but does anyone have a pic of their engine bay after the smog pump delete? I REALLY want to do this to mine when I get the time. The bearings in it are getting noisy, and it sounds terrible.
Cargo Master
Joined: Jul 2003
Posts: 2,328
Likes: 14
From: Colorado
I'll be removing mine when I install my new headers in a few weeks..... and I'll post up some pics!