Execut1ve

I'm getting a consistent code 311 on my '94 302 (thermactor system inoperative) My Chilton's doesn't have any significant information on the thermactor system and how to work on it can anyone point me to a wiring diagram or give me a procedure for finding out what is wrong? Thanks!

Execut1ve

my understanding is that the thermactor system helps the catalytic converters by injecting fresh air as needed into the exhaust. in light of that:

1) how is the computer sensing that the thermactor system isn't working? by some sensor in the exhaust?

2) could my cats be bad?

Execut1ve

I've also heard thermactor is a fancy word for smog pump, is this true?

dr_bowtie

yep and it means the divertor sensor isnt working or the connection is bad...

Execut1ve

where is this sensor located and how would I check it?

dr_bowtie

where all the hoses come together for the AIR pump...there is wires on the divertor...check that

Execut1ve

and I gotta ask... I thought bowtie was the chevy emblem?

Just call me Sean

iTrader: (1)

Dr. Bowtie is the Chevy man, with a Ford truck. There is no sensor on the thermactor valve. The computer can only tell if the control solenoids are working, so make sure they're plugged in and getting vacuum. They're on the drivers side valve cover.

dr_bowtie

LOL

Execut1ve

now that's a weird smiley :P I've checked the wires to the TAB and TAD solenoids, everything seems to be plugged in, so barring electrical issues elsewhere I have to assume it's vacuum, yes? Is there a better way to test the vacuum lines than turn in the truck, unplug and see if there is vacuum?