mustang86cars

I need some help!!!
After just replacing my exhaust from the cats back on my 86 GT I happen to notice a loose tube, about the diameter of a nickle, which ties into both exhaust pipes just before the H-pipe. The pipe runs all the way up to a series of vacum control valves inside the engine compartment then it looks like this tube mounts to the rear of each head near the firewall.

What is it?? Do I need to replace it or can I bypass it if its not needed.

Someone please give me a clue.

callmecobra

sounds like the line the runs from the smog pump to the cats...if the hose was off, you would hear the smog pump cycling periodically.

mustang86cars

Is this somthing I can eliminate or should I have this tube replaced?? What does the smog pump do??

callmecobra

you cant elminate the smog pump line...it would blow **** into your engine compartment. however, you could elimiate the smog pump, but if you have emissions where you live, im not sure if you would pass

mustang86cars

Could I seal off the lines on the exhaust side and also the line going to the heads, remove the pump and seal off all the vacume lines??

Do I need this system working for the car to run properly?

Brian18034

I believe it pushes fresh air in to reduce the overall percentage of emissions out. (by diluting it) If you bypass it or block it, you are only hurting your emissions.