Tab & Tad
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Junior Member
Joined: Dec 2004
Posts: 1
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From: oceanside, CA
Tab & Tad
I have a hose coming from the TAB on my 1990 5.8 F150 that is broken and i cant tell where it is supposed to go to, I have looked all through the chiltons manual and cant seem to find anything on it. the hose is yellowish/tan. any help would be greatly appreciated.
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
The TAB valve has a feed from the air pump. The other line goes to a diverter valve called a TAD.
The TAB does two things. It passes air to the TAD diverter or vents the air to atmosphere.
The TAD either passes the pump air to exhaust passages in the heads and manifolds or directs it to the cat convertor, at the direction of the computer.
The TAB does two things. It passes air to the TAD diverter or vents the air to atmosphere.
The TAD either passes the pump air to exhaust passages in the heads and manifolds or directs it to the cat convertor, at the direction of the computer.