TAD Missing
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Freshman User
Joined: Sep 2004
Posts: 41
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From: Pahrump NV
TAD Missing
I had a TAD(Thermactor Air Diverter) valve (I think). At any rate I was in the process of replacing the oil pan and valve cover gaskets, new spark plug wires, coil, and rotor cap, when I noticed that the TAD was missing.
I've got one on order from a Ford dealership.
Will the fact that the TAD is MIA cause any problems if I start the engine and run it?
Thanks
Guy
I've got one on order from a Ford dealership.
Will the fact that the TAD is MIA cause any problems if I start the engine and run it?
Thanks
Guy
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Are you talking about the valve or the solenoid that controls it? The only part of the system the computer knows even exists is the solenoid but even then it's absence will do nothing more than set a low priority code.
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Freshman User
Joined: Sep 2004
Posts: 41
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From: Pahrump NV
Thanks for your reply Paul... I forgot to mention that it is the solenoid.
I have the Thermactor Air Bypass Solenoid. I'm apparently missing the Air Diverter Solenoid. But as I look at the Thermactor valve assembly ..it looks
like a "single" Valve is doing "double-duty" i.e. working as both the Air Bypass and Air Diverter valves
I'll go ahead and start it and do a test drive.
Thanks again
Guy
I have the Thermactor Air Bypass Solenoid. I'm apparently missing the Air Diverter Solenoid. But as I look at the Thermactor valve assembly ..it looks
like a "single" Valve is doing "double-duty" i.e. working as both the Air Bypass and Air Diverter valves
I'll go ahead and start it and do a test drive.
Thanks again
Guy
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Yeah, that is the combined assembly. Did you recently buy this truck and find it this way? As Paul mentioned, it'll throw a low priority code when the PCM goes to energize the solenoid if it doesn't find it.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
Not sure but believe it has all to do with cubic inch displacement? but might be wrong....
My 351 doesn't have the Thermactor Air Bypass valve it never did, it had no tube directly down to cat, tube to back of each exhaust manifold only.
It has the Thermactor Air Diverter only, directs air either to atmosphere or into manifolds handling both jobs all in that single device.
460 on the other hand (both trucks over 8500lbs gvwr), 460 has air via tube down to cat or to manifolds.
No air required the Thermactor Air Bypass valve dumps it to atmosphere right behind the air pump, air required system either sends into manifolds or down directly into the Cat via the Thermactor Air Diverter mounted up on the engine. system uses both valves rather than just one, the when and why part I don't know never got into it that deep. That air feed directly to cat or into the manifolds instead part.
351 I eliminated the cat and later remainder of air system, don't get any codes even though vac lines are gone with it, left its control solenoid electrically active.
As Paul pointed out only aspect of the system the computer is aware of, the tab/tad solenoid/s, retain it get no codes.
My 351 doesn't have the Thermactor Air Bypass valve it never did, it had no tube directly down to cat, tube to back of each exhaust manifold only.
It has the Thermactor Air Diverter only, directs air either to atmosphere or into manifolds handling both jobs all in that single device.
460 on the other hand (both trucks over 8500lbs gvwr), 460 has air via tube down to cat or to manifolds.
No air required the Thermactor Air Bypass valve dumps it to atmosphere right behind the air pump, air required system either sends into manifolds or down directly into the Cat via the Thermactor Air Diverter mounted up on the engine. system uses both valves rather than just one, the when and why part I don't know never got into it that deep. That air feed directly to cat or into the manifolds instead part.
351 I eliminated the cat and later remainder of air system, don't get any codes even though vac lines are gone with it, left its control solenoid electrically active.
As Paul pointed out only aspect of the system the computer is aware of, the tab/tad solenoid/s, retain it get no codes.
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