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bourbon · 02-13-2005, 04:58 PM

hey guys,

i just joined today and i have a 1989 mustang gt. i have a question about my other car though. i thought maybe you guys might be able to help.

i have a 1988 crown vic with a 5.0 efi. i think someone screwed with air pump and vacuum connections.

ive owned the car for about 3 years now and have always gotten a code 46 from the puter. 46 is: thermactor air system unable to bypass air (vent to atmosphere).

so i look and look for the bypass valve and there just isnt one! there is one thermactor divertor valve (with air pump in and manifold and cat output hoses and one vacuum line that goes to TAD).

so then i look at where the TAB vacuum is going to. it connects to the fuel vapor storage canister purge solenoid. this cant be right. there is a connector that connects into the nipple end of the TAB vacuum line and then there is a hose that goes to the canister purge solenoid which then goes to the carbon canister.

am i right in assuming this is just plain wrong and i need a bypass valve in there? and that the purge solenoid should actually be connected to the manifold vacuum at the manifold?

also, there is another vacuum line connection on my air pump exactly like the one in this pic: http://www.rockauto.com/ref/Motorcra...ml?cx-1136.gif
on mine there is just a vacuum line that runs in a circle from one outlet to the other about 2 feet long. i cant figure it out. are these suppose to be used for something else?

any help would be appreciated

02-13-2005, 04:58 PM	#1
bourbon Registered Member Join Date: Feb 2005 Location: Minneapolis USA Posts: 31	TAB and air pump connections hey guys, i just joined today and i have a 1989 mustang gt. i have a question about my other car though. i thought maybe you guys might be able to help. i have a 1988 crown vic with a 5.0 efi. i think someone screwed with air pump and vacuum connections. ive owned the car for about 3 years now and have always gotten a code 46 from the puter. 46 is: thermactor air system unable to bypass air (vent to atmosphere). so i look and look for the bypass valve and there just isnt one! there is one thermactor divertor valve (with air pump in and manifold and cat output hoses and one vacuum line that goes to TAD). so then i look at where the TAB vacuum is going to. it connects to the fuel vapor storage canister purge solenoid. this cant be right. there is a connector that connects into the nipple end of the TAB vacuum line and then there is a hose that goes to the canister purge solenoid which then goes to the carbon canister. am i right in assuming this is just plain wrong and i need a bypass valve in there? and that the purge solenoid should actually be connected to the manifold vacuum at the manifold? also, there is another vacuum line connection on my air pump exactly like the one in this pic: http://www.rockauto.com/ref/Motorcra...ml?cx-1136.gif on mine there is just a vacuum line that runs in a circle from one outlet to the other about 2 feet long. i cant figure it out. are these suppose to be used for something else? any help would be appreciated