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Thread: Code 44 on koer

  1. #1

    Default Code 44 on koer

    The only code I have left is in the koer part. Its a code 44r which is a thermactor issue. Thing is everything works and the cross over tube is clear. Heads were cleand and worked on when the motor was rebuilt. I seem to remember the crossover (air injection thbe) being cleaned as well.

    Could a bad one way valve cause this code? I can swear I can feel something coming from that air injection tube when i take the hose off.
    1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD.
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  2. #2
    FEP Super Member TWR2003's Avatar
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    During KOER the EEC tests the Thermactor (secondary air) system by commanding it to supply air to the backs of the heads and/or the cats. It then looks for a response from the O2 sensors. If it does not see the expected response it logs the error code for that bank. Several failure modes can cause this such as the Thermactor air is not getting into the exhaust stream or the O2 sensors are not responding to the additional oxygen. Since you have no other codes I would suspect a failure in the Thermator control/distribution system rather than a failed O2 sensor.
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  3. #3

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    Checked through the whole system during lunch.

    The diverter and the bypass valves both work. The TAB/TAD solenoids do open and close them. Check the bypass valve when cold and the diverter valve when warmed up.

    The one way check valve for the air injection crossover to the back of the heads is stuck open. I checked it when the engine was cold, with the diverter valve disconnected from that crossover one way check valve I can feel "air" coming out of that valve. There is also a bunch of crud in it... which I think is why it's stuck open.

    Could this be the source of the code 44?

    If anything it's probably causing stress to my diverter valve.
    1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD.
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  4. #4
    FEP Super Member TWR2003's Avatar
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    The check valve just prevents exhaust gases from 'backing up' when the diverter valve is closed (dumping) and will NOT be the source of you code 44.

    What I really suspect is the issue is that secondary air is not reaching the exhaut ports and/or catcon on the side that the code was for. You will need to verify that all the plumbing - including the rear crossover and the passages in the head are clear so that air can flow thru them to reach the exhaust stream. Clogging of the Thermactor passages is fairly common especially on older engines.
    Last edited by TWR2003; 03-22-2013 at 03:50 PM.
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  5. #5

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    Quote Originally Posted by TWR2003 View Post
    The check valve just prevents exhaust gases from 'backing up' when the diverter valve is closed (dumping) and will NOT be the source of you code 44.

    What I really suspect is the issue is that secondary air is not reaching the exhaut ports and/or catcon on the side that the code was for. You will need to verify that all the plumbing - including the rear crossover and the passages in the head are clear so that air can flow thru them to reach the exhaust stream. Clogging of the Thermactor passages is fairly common especially on older engines.
    It's a motor that was rebuilt less than a year ago. The heads were completely redone with a valve job. I don't think the heads are blocked.

    However, I will try to look at the cross over tonight and see what I find. But I'm sure that was cleaned as well.
    1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD.
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  6. #6
    FEP Super Member TWR2003's Avatar
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    Quote Originally Posted by Marz View Post
    It's a motor that was rebuilt less than a year ago. The heads were completely redone with a valve job. I don't think the heads are blocked.

    However, I will try to look at the cross over tonight and see what I find. But I'm sure that was cleaned as well.
    Basically the air (oxygen) has to get into the exhaust stream and the O2 sensors need to see it. If you are certain the air is getting there then perhaps you do have an O2 sensor issue on that side. You can try swapping the O2 sensors and see if the code changes from 44 to 94.
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  7. #7

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    Well, I took the crossover off. It was clean. But I ran a wire through it anyways.

    And I took that same wire and poked around in the air injection hole and found it was clogged. I tried to clean it the best I could. Car seems to run better. Seems like it has more power.

    Strange that head was dirty. I had them tanked and rebuilt.
    1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD.
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  8. #8
    FEP Super Member TWR2003's Avatar
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    Quote Originally Posted by Marz View Post
    Well, I took the crossover off. It was clean. But I ran a wire through it anyways.

    And I took that same wire and poked around in the air injection hole and found it was clogged. I tried to clean it the best I could. Car seems to run better. Seems like it has more power.

    Strange that head was dirty. I had them tanked and rebuilt.
    Was it clogged on the passenger side (ie code 44)?

    It can be very difficult to clean out those passages with the heads on the engine as there are small intersecting passages at each port that cannot be reached from the rear.
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  9. #9

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    I reached it from the rear. Used 16 gage bus wire.

    Btw: bus wire as in copper solid core solder coated wire that is used on satellites.

    I even started the car with the tube off to try and bow out what was left in the passeges. I let the car sit overnight with the battery disconnected. We'll see if i have to go in there again.
    1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD.
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  10. #10
    FEP Super Member TWR2003's Avatar
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    Quote Originally Posted by Marz View Post
    I reached it from the rear. Used 16 gage bus wire.

    Btw: bus wire as in copper solid core solder coated wire that is used on satellites.

    I even started the car with the tube off to try and bow out what was left in the passeges. I let the car sit overnight with the battery disconnected. We'll see if i have to go in there again.
    You only need to disconnect the battery for 3 -5 minutes or so to clear the KAM in the ECU.

    Like I said there are small intersecting passages that go from the main passage that runs the length of the head to each exhaust port. You will not be able clean out those small passages from the back. They must be addressed with the heads off and valves remove and alot of head rebuilders dont bother with them.

    You can see the main air passage (round) and intersecting passage in this x-section of an E7 exhaust port:
    Last edited by TWR2003; 03-23-2013 at 12:24 PM.
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  11. #11

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    The heads are actually e5 heads. The whole motor is from my 85 GT. e5 cam and heads
    1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD.
    Cardomain: http://www.cardomain.com/ride/565542
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  12. #12
    FEP Super Member TWR2003's Avatar
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    E5 and E7 heads have same Thermactor passages
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