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Discussion Starter #1
According to the code sheet its for the Poor or No Flow Evaporative Emmissions (Purge/Charcoal Canister)

Now looking at the complete circuit,, I see a line that goes to the tank and to the charcoal canister and to the purge solenoid.

How does the computer know if its hooked up to vacuum or not? What exactly sense's that?

I can understand if the purge solenoid was disconnected but not if the vacuum line wasnt.

Reason I ask is its the only thing I didnt hook up,, and the light stayed off for quite some time,, I actually for the first time drove the car farther then 1 mile by going to get it emmision tested (IT PASSED!) but as soon as I pull out and leave the place the light came on? (thank god it held out! lol)

Brad
 

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3rd Gear Chirper
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Usually when an engine computer (generally speaking, this is not limited to Fords) commands a vacuum valve to open, it will expect to see a change in the air-fuel ratio via the signal from the oxygen sensors. This is caused by the extra air entering through the open valve creating a lean condtion.
 

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Discussion Starter #4
Hotbird,,, that was exactly what I was thinking.

Master486: is that from a 96/97 tbird?? because I dont see anything like that on my car
 

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Fry Rice Specialist
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it is right under the air filter assembly. kinada hard to access it.
 

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SplitPortBird said:
Master486: is that from a 96/97 tbird?? because I dont see anything like that on my car
Yeah I've got it on my 96 so I'd assume it's also on 97. Don't know about earlier years though. Like Casper said, it's kinda hard to see.
 
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