I would suggest doing every manual check you can that relates to your pcm before changing it(TAB,TAD,AIRD,AIRB....), but it's probably a related culprit. I know you already changed your EEC relay, but read this article anyway.

http://web.archive.org/web/20040216225246/http://atcdg.com/TechBulletins/bull_125.htm

Based on that I would yake a good look at all the wires leading to your EEC relay.

 

i went to the site on the EEC relay,it talks about'89 and newer.mine is a'87.i'll check into it .how do i get started on checking into TAB,TAD,AIRD,AIRB.....any info would be great. thanks.

 

Do you have a manual?

 

Hey bud, based on your other thread it sounds like you have some emissions trouble, just in incase you don't have a manual I'll type out a bit of what I found...

Fuel evaporation emissions control system description and checks...

The system is designed to prevent raw fuel vapor from being released into the atmosphere during both engine on and engine off conditions. to provide containment of the vapors when the vehicle is not being operated, the entire fuel system must be closed.This is done through the use of a check valve fuel tank filler cap on the supply end and a sealed carburetor bowl on the delivery end. If left in this closed condition, fuel vapor pressure could increase to damaging levels. To prevent this each vapor source is connected to a single vapor absorbing charcoal canister, which under normal conditions keeps vapor pressure to reasonable limits. If exceeded, a vapor relief valve is built into the fuel tank to momentarily relieve trapped vapor pressure.

2. At some point the canister will become saturated and must be purged of vapor to be useful again. To accomplish this vapors are fed to the engine for consumption each time the engine reaches operating conditions. This completes the cycle. Execution of this cycle requires several control devices.

Skipping along....

Fuel injected engines

8. First vapors trapped in the gas tank is vented through a one way rollover check valve in the top of the tank. The vapor The vapors leaves the valve through a single line and is routed to a charcoal canister located in the engine compartment.

9. The canister outlet is connected to an electrically activated canister purge solenoid, which is in turn connected to the intake manifold. The canister purge solenoid valve is normally closed when the engine is not at operating conditions, forcing vapors to the charcoal canister. The purge solenoid is controlled by the EEC PCM, which energizes (opens) the valve only when the proper operating conditions are met. When open, vapors travel through the valve into the intake tract where they are consumed by the combustion process. The purge hose is usually connected to the throttle body purge port(s) or to the vacuum side of the PCV hose. Purge solenoids can be found either free floating between canister and engine purge hoses or mounted to the throttle body.

 

Damn....I saw your name on Vancouver Island's thread and thought you were the OP. Well that was a waste of 1/2 an hour of my life....disregard last post.

 

thanks duppy for the info.i will get a manual this weekend.i'm new to the site and trying to learn as much as i can.for awhile i've been reading threads to see if others have the same type problems.it has helped.i got stuck,so i posted my own thread.any and all help is great,thanks.

 

This may sound simple, but do you have an original gas cap? Sometimes the vacuum created (or not created) will cause this problem.

 

this afternoon i was able to get the codes,...... as follows,23, 67, 81, 82. 23 is the tps voltage out of self ctest spec. 67 is the a/c clutch because the a/c doesn't work. 81 is TAD solenoid circuit failure. 82 is TAB solenoid circuit failure.the first 2 i know what they are.what the h... is a TAD and TAB and where are they? any and all help would be great. the gas cap doesn't look original.

 

Via Fordfuelinjection.com, a site you WANT to bookmark:

Thermactor Air Bypass (TAB) shunts air to the atmosphere, when no air is needed. When air is needed it sends air to the second valve TAD.
Thermactor Air Diverter (TAD) diverts air either to the exhaust manifold, or directly to the catalytic converter.

 

thanks Virto,where are these 2 items.i don't have a cat.i'll probibly start with the tps first.

 

TAB and TAD are the AIR/Smog pump. they are located on the driver side by the idniton coil if you have a 302 or 351

 

For your 4.9 go to this thread for the location:
https://www.ford-trucks.com/forums/8...ml#post8085033

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thanks subford.i went to the link,and i see about where they are,but the diagram is fuzzy.sorry my eyes aren't what they used to be. i guess i go to the auto part store to see what they look like today.i've been picking up alot of good info. on this site.my 87 f-150 4x4 still needs some work and hope to have him in the woods soon.

 

Maybe this will help.

The A.I.R. Sol:


EGR solenoid:


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thank you ,thank you,i was wondering what those thing were.the book i got tells me how to test them but doesn't tell me where they are.maybe you can tell me where the electro-drive fans are? any and all help would be great. thanks