Smog Pump 351W
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Freshman User
Joined: Jan 2009
Posts: 34
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From: Oxford Georgia
Smog Pump 351W
Hey guys, I am rebuilding a 1985 F-150 with the 351W for a friend of mine. He wants to delete the smog pump and all of its components.
Can anyone give me any information on anything I would have to BUY when i remove all of this crap? thanks in advance
Can anyone give me any information on anything I would have to BUY when i remove all of this crap? thanks in advance
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Yes get rid of all the smog junk and don't lose a second of sleep over it, and if so equipped make double sure you also lose that stupid heat riser butterfly valve between the passenger exhaust manifold and Y pipe.
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Freshman User
Joined: Jan 2009
Posts: 34
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From: Oxford Georgia
ok,so if i buy headeders, can i just weld a thread-o-let into the header for the O2 sensor and it work properly????
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Freshman User
Joined: Jan 2009
Posts: 34
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From: Oxford Georgia
so....
just to make sure i have everything in order.
remove smog pump and all corresponding plumbing.
the TAD, TAB, and EVR solenoids can be left inplace and wired in, just no vacuum lines
leave EGR valve in place, just remove tube that goes to headers.
O2 has to be in place
with this being done, the engine will throw no CEL, idle propery, and not run rich or lean.
CORRECT??????
just to make sure i have everything in order.
remove smog pump and all corresponding plumbing.
the TAD, TAB, and EVR solenoids can be left inplace and wired in, just no vacuum lines
leave EGR valve in place, just remove tube that goes to headers.
O2 has to be in place
with this being done, the engine will throw no CEL, idle propery, and not run rich or lean.
CORRECT??????
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Elder User
Joined: Nov 2009
Posts: 666
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From: Chicago area
You didn't say if carb or FI?
If FI you have SD (Speed Density) injection.
The EGR system should be left in place and functional.
It doesn't limit power as it only mixes exhaust gases with the incoming fuel/air mixture under certain conditions. When you ask your engine for high power the EGR system is disabled.
It also reduces the combustion temps in the cylinder which reduces the engines octane requirement. What this means is that if the engine was on the limit of pinging then removing the EGR may cause it to start doing so.
You would then either have to use a higher octane fuel or retard the timing
One will cost you more money when you buy fuel and one will cost you performance and fuel mileage!
If FI you have SD (Speed Density) injection.
The EGR system should be left in place and functional.
It doesn't limit power as it only mixes exhaust gases with the incoming fuel/air mixture under certain conditions. When you ask your engine for high power the EGR system is disabled.
It also reduces the combustion temps in the cylinder which reduces the engines octane requirement. What this means is that if the engine was on the limit of pinging then removing the EGR may cause it to start doing so.
You would then either have to use a higher octane fuel or retard the timing
One will cost you more money when you buy fuel and one will cost you performance and fuel mileage!
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5th Wheeling
Joined: Apr 2010
Posts: 47
Likes: 2
Don't forget to plug the air injection lines at the back of the cyl heads where the air gets injected there. On the HO there was a steel tube with an air check valve about centered on the intake and that smog pump was plumbed in there too.
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Freshman User
Joined: Jan 2009
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From: Oxford Georgia
its a speed density FI 351. the egr valve is in place and plugged in electrically and by vacuum. The pipe from the valve to the passenger exhaust manifold is capped. tis was done before i ever touched the truck. I am gonna go ahead and do away with the smog system along with all the BS that goes along with it. I am going to put the EGR back like I found it and go from there. Thanks again guys.
Postmaster
Joined: May 2008
Posts: 2,703
Likes: 3
From: La Vergne, TN
its a speed density FI 351. the egr valve is in place and plugged in electrically and by vacuum. The pipe from the valve to the passenger exhaust manifold is capped. tis was done before i ever touched the truck. I am gonna go ahead and do away with the smog system along with all the BS that goes along with it. I am going to put the EGR back like I found it and go from there. Thanks again guys.
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