smog pump question?
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Cross-Country
Joined: Sep 2006
Posts: 53
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smog pump question?
I guess that is what it is called. On my 93 f150, 302, the pump at the bottom where the hose comes off and goes into a can on the fender. Then another flexible hose comes off and goes nowhere. Is that right? It has some vacuum to it when it is running. Don't remember seeing it just laying there?
Also my cat. convertors are no longer on the truck, do i need to do anything?
is the pump still neccessary?
Also my cat. convertors are no longer on the truck, do i need to do anything?
is the pump still neccessary?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Originally there would have been a hard tube connecting ports on the back of the cylinder heads, and this was fed from the air pump. There would also be another valve that directed air down to the cats. If the cats are gone and the head ports are plugged, you can remove the pump and use a shorter serpentine belt. There is no performance gain to be had with this though.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Originally Posted by acdc
okay i understand that but is the flexible hose coming off the can supposed to be just there and not connected to something?
Elder User
Joined: May 2006
Posts: 623
Likes: 1
From: Mississauga,Ont.,Canada
I think he has the same setup as my 88 .There is a can (it may be black plastic) , near the coffee can that has a hose that sits loose on the inner fender. I think the smog pump draws fresh air through this hose and into the can and then to the rest of the secondary air system. I think it serves as either a muffler or has a filter inside to keep debris from damaging the air pump impeller. If required I can check the exact hose routing tonight.
