I just got some Hooker shorty headers and they don't have the air pump ports like my stock exhaust manifolds do.

If I install these headers will the o2 sensor tell the computer it needs to lean out the fuel?

I have talked to 3 well known mechanics - they say the o2 sensor will not bother the engine's computer.

If it does, should I run a line from the air pump to the down pipe after the header?

1997 4x4 F250 HD 5.8/351 5-speed.

Thanks!

Larry

 

im not completey sure that the exp. work like the Mustangs but if im correct you should be fine. you see your exp. has 2 or 4 catalitick (i dont think i spelled that right) converters that all will act on the o2 reading you get. thoes shorty headers more then likey had a set on them. You have 2 sets of o2s the first is eather on the headers of just after them on the h-pipe the other set will be on the very end of the h-pipe or somewhere before your mufflers. if your going to get a sensor form eather of the sets its going to be form the second set to get rid of the check eng. light all you have to do is git some MIL elimnators. these will go between the o2 and the h-pipe. HOWEVER IT WILL NOT CORRECT THE RICHNESS OF THE FUEL!!! the only way for you to get perfect air/fuel is to get a chip that will even out for the new higher flowin exhaust. But dont worry its no big thing you wont even be able to tell the differince in the way the car drives or in the performance. i have a 99 mustang gt with long tube headers a high-flow h and a borla 1 chamber cat back. i used the mil elimnator and they stoped the check eng. lite. YES im most likely running a little rich but nothing that is going to make any real differince. there is a chance that the mustangs and exps. are really differint but if i know ford they are most likely the exact same. Hope this helped.

 

You need the upstream O2 sensors (closest to the engine) to control the EFI system. If there are no ports for them in your headers, you will have to have bungs welded into your h-pipe for them. The downstream sensor(s) simply monitor catalytic convertor function. On those you can use the MIL eliminator.