CODE: 94 (KOER) - Left Thermactor Inoperative
Engine: 5.0L
Year: 86-93
Description:
Thermactor air system inoperative (left side)

CODE: 44 (KOER) - Right Thermactor Inoperative
Engine: 5.0L
Year: 86-93
Description:
Thermactor air system inoperative (right side


As to what they mean? i dunno. Did you yank any of your smog stuff out besides the cats? Ditching the cats won't toss a light. Something is wrong

 

This is referring to the TAB/TAD solenoids having a problem. They are located on the back side of the passenger shock tower underneath the EVR solenoid.


Bill

 

huh!?!

I am still not sure what to do here...

So far, my car has no cats... New exhaust... I have pulled the little pipe going from the air pump valves down to the cats.
The air pump is still currently pumping air and is still hooked to the back of my heads... (Thermator or whatever it's called) . Now the TAD/TAB solenoids are mentioned.... What are they, what do they do... and why would they be giving me codes 94 and 44.
The car has been running like crap for a while now, and i could never figure out why. I had to swap the EGR last fall... Been having problems ever since it pulled a code. Maybe i am somehow loosing vaccum or something.
Still doesn't make sense. I thought that this stuff wouldn't set off any eec codes.
Has anyone else run into this. What happens when i pull the air pump off...?

 

I get those same codes! I also get code 33...EGR. Guess are cars are related! I guess those solenoids would be better off in the can...Need to do some more homework before I yank em though...

 

ttt

I finally tried again... i got code 32 as well. EGR... I just replaced it last year... Why is my car going through EGR's so fast...? Anyways, i pulled it off and cleaned it out.
Anyone else got any ideas about codes 94 and 44... i am still getting those.
Again i have no cats, and the little pipe going to them is pulled off at the TEE in the hoses from the air pump... i think it is more than a TEE probably a valve of some sort.

Anyone?!? know about this stuff?

 

I just pulled the same codes tonight! I have cats and all emissions in place but my car started running like crap (symptoms of both very lean and very rich). What do we need to replace?

 

The thermactor system injects air into the exhaust ports in the heads downstream from the valves. Air is supplied from the smog pump through tubing and the TAD/TAB valves to a copper pipe between the heads on the firewall side of the engine, and ultimately to the exhaust passages. If your smog pump is disabled, or your disconnected the tubing or blocked the thermactor holes in the back of the heads, or if the TAD/TAB valves are bad, you will get these codes. My car has all of this stuff removed and used TFS Track Heat heads (with no thermactor provision), and naturally pulls these codes.

As far as I know, the KOER test pumps atmosphere into the exhaust ports and watches for a response on the O2 sensors, first on the right side, then on the left side. If your O2 sensors are bad, or if the air injection system is disabled or not working properly you should get these codes.

My car runs fine with these codes set, so if you have a poor running car, it might be further evidence that the O2 sensors are bad or marginal. Check the air injection system first though.

As for code 33, take the EGR valve off and clean it up well with carb cleaner. It is more likely that the valve itself is gummed up than that the sensor is bad.

-Matthew

 

This might not help, but...
I had the exact same codes, I replaced the all the vacuum lines, O2 L/R, EVP sensor, control valves. None of it worked. After a couple of months of studying with no answer in sight I replaced the Ignition Module. No problems since, not 1 code.
Like I said, this will probably not be the same problem, but hopefully it will lead to a solution. Good Luck.

 

When you disconnect the smog pump, 44 and 94 are the codes you get when you scan. They will not set off the CE lights, but the computer is telling you the smog pump and air system is not working (as you already know since it is not there or functioning)

Leave the EGR plugged into the vacuum and electrical there. you can bypass the water lines on the EGR spacer plate if you are not pumping the exhaust gases up there.

 

Ok, based on another thread I disconnected my air pump tubes where they connect to the pipes going to the back of the heads. The car ran a little better with them disconnected, but still not back to normal. Strange thing I noticed was that air was only blowing out of one of the hoses from the air pump. Is my diverter valve bad?

I checked the resistance of my tab and tad solonoids and they were both ~78ohms. The resistance of the EGR diverter solonoid was ~44ohms.

I may switch back to my old O2 sensors since they worked fine, but is there anything else I can check or replace? Something isn't right.

(already replaced tps, IAC and cleaned EGR)

 

I had the same problem with the same codes and tried just about all the same fixes and then some. Very frustrating. Finally, I replaced the TFI module as DEACpe suggested, and the problem went away! This may not be your solution, but it worked for me. Thanks DEACpe!

 

I am not sure about any of that other stuff...

So... when the air pump is new and functional on a stock stang... does it force cleam new air into both the chamber in the heads, as well as ahead of the catalytic converters...? And as far as taking the pipes off... what is the thread that goes into the solid pipe between the heads... coming from the air pump. Is there a single fitting I can thread into it.?