Hi. I've got a 1989 f-250 with an 300 I6. it's got 163,000 miles on it. I replaced the O2 sensor and it started throwing a code 44 (KOER). Also, it's showing a code 81 c KOEO. The engine seems to run just fine. Starts right up. Seems to idyl fine and has no issues that I can notice.No check engine light. I've been trying for two days to figure out what's causing the fault codes. Can't even really find a clear definition of what they mean. Can someone help me? Thanks.

 

its your smog/emissions, TAB/TAD, can you tell if the smog/emissions is still on truck
Fuel Injection Technical Library » 2 Digit Self-test Codes 11-32

 

81 in C mode is the MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation. This is the code he got because it was in continuous memory.
Start your test again and unplug your reader or jumper when the test starts. This will clear that code. Then you can check again after driving and see if it still comes back.
Sandy

 

Thanks. Yes. The smog emmissions is still on the truck. I'm not sure what the reference to 11-32 was? So... would my next step be to test the Tab and Tad solenoids? Thanks for the help!

 

Thanks Sandymane. I will clear that code tomorrow when I run the test again.

 

That was the segment of codes in the list. I there are four different segments that contain all the codes. Down at the bottom of the page you can see them.

 

Thanks Sandymane. I missed that reference. Got it now. So, I assume my next move is to test the secondary air controls - the solenoid valves Tad and TAB? Would you know any good online reference for that procedure with my 4.9 L, 1989 ford engine? Thanks.

 

I checked the air bypass and diverter valve today on my 1989 f-250, 4.9L, (EEC). The air pump, hoses and combined valves were all fine and operational, but no vacuum getting to them. I checked the vacumm lines, no leaks, I traced the vacuum lines to the back of the engine (drivers side) to a panel (bolted to the engine) of three solenoids. I think a TAD, TAB and EGR solenoid valve. All of the solenoids were getting supplied with vacuum in, but were not passing any vacuum out. I removed the power leads from each solenoid and then removed entire panel with all three attached and hooked up a vacuum pump to the vacuum supply nipples and a vacuum gauge to the out going nipples. When I added vacuum with the pump none of them held vacuum. Then I hooked up 12 v power and a ground to each solenoid. None of them would take or hold vacuum. I then switched the vacuum pump to the (upper) nipples that were designed to expel vacuum and added vacuum. They took and held vacuum in that nipple. These all appear to be the original (1989) vacuum solenoids and it appears to me that they are all bad. Since they are all part of the emmisions system and I've never lived in a state where they checked these, and they don't light up my check engine light, I have no idea how long they've not worked.Anyway, I'd like to replace both the TAB and TAD solenoids and the EGR solenoid valve, but I can't seem to find them online? Do you have any comments on my conclusion and some advice as to where I can get replacement parts that will be suitable for my engine with the same electrical plug ins and vacuum line nipples? Sorry my explanation took so long, but I wanted to be thorough. I really appreciate the help!

 

Here is a video on how to test them. It has a couple of steps that might help you. Sandy

 

Thanks Sandyman. Good video! So, my TAB and TAD vacuum control solenoids both tested bad. As did my EGR vcs. The two air solenoids look very similiar to each other, but they are not the same. The electrical plugs for each are different. they are both Ford OEM parts, but the numbers on the top of them are different - 0449 and 0469. The number on the EGR solenoid is: Ford number EBTE-9J459-BIA I can't seem to locate these on online. Would you have a suggestion as to where I can look? Thank you so much. And, Happy Easter Day!!

 

I really don't know as I have never bought one. I think people are getting them from the salvage yards but not sure. Rock Auto doesn't show them. Maybe someone will chime in and offer a source. Happy Easter to you also. Sandy

 

Anybody have any suggestions as to where I can pick up these two vacuum solenoids (TAB and TAD) for my 1989, 4.9, 4x4 f-250? I don't have a wrecking yard anywhere near. Sure would appreciate any advice. Thanks!

 

before you go buy see link below and retest
read post #5 by kawamatt2..excerpt from post..The service manual calls to put the ecm into Diagnostic Test Mode and test the voltage across the TAD and TAB solenoid connectors. The spec said you should see a slight voltage increase as you move the throttle plate while in this DTM mode. Tested the TAB solenoid and the voltage did in fact increase as I moved the throttle from the idle position up. The same was true for the TAD solenoid.
TAD Solenoid Function Testing | Full Size Ford Bronco Forum <--click on link, takes you to thread

 

Thanks Torqta 58. Good information in the link. But it doesn't pertain to my situation. My TAB and TAD solenoids are toast. I even took one apart. At some point it appears they got wet and they're ruined. I've got Vacuum and power to them. But they remained closed and won't pass vacuum. I even put outside 12 volt power and ground to the two electric connections on the solenoids.. Nada. There is simply no movement or sound. They are just gone. So, I need to replace them and i'm looking for OEM or after market solenoids. But not having any luck finding them online. I guess I could jerk the pump and all the hoses off and plug the holes, etc. But, honestly, I'd just as soon keep the engine stock if possible. Just need those two vacuum control valve solenoids for my 1989, 300 inline six. Thanks!

 

I checked a mustang site and some of these look like they may work. The sellers name is under each picture. I would call them and see if they know if they will work or maybe you can visually ID a fit. Good luck. Sandy


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