Well after figuring out my earlier code I am now dealing with another except this time Im running rich instead of running lean. The good thing is the truck actually is running rich lol instead of reading lean and being obviously rich.

The code is 42 always rich. I have picked up a Genuine Ford CD manual and have studied and followed the flow charts. It seems according to the manual my problem is more than likely Carburetor related.

All the checks on this code come back good. There is this one step "Force system lean" to where Ford wants the Tech to manually create a vacuum leak to check and see if the ECM would respond to it by unplugging a 7/32 vacuum port on the vacuum tree. After I unplugged the 7/32 vacuum port and reran the KOER test it came back "code 44, problem with air injection". The thing is, Ford says ignore all other codes at that time and proceed as follows to the next step, checking EVAP system if code 42 is no longer present. If EVAP checks out then it says go to the fuel related section. Well like I said everything checked out fine, including the MC solenoid and Purge Solenoid.

So I guess what I was wondering is if my Computer is actually responding to actual conditions and not being locked in Limp mode.

MC solenoid is being pulsed on and off rapidly.
Computer reads lean when 02 circuit wire jumped to ground.
I get code 44 instead of 42 when creating a 7/32 leak to manifold vacuum.
MC solenoid will make engine run rough when manually energized.
Engine has a good idle but rich according to my meter and computer.
Computer does turn EGR on and off according to my vacuum gauge and DVM
My DVM reads 11volts at idle and 7volts when revved on FBC wire to -post
Test light hooked to FBC wire shows fast pulsing, flashes get brighter when revved.


Well what do yall think. Is my problem fuel related and not electrical? I know the possible reasons on the carb that could make it rich. First things first is making sure all electrical things checks out including MC solenoid. Thanks in advance for any info.

1984 f250 4x4 4.9 300

 

So the computer says it's rich, and it's obviously rich from the exhaust smell? It looks like the computer is responding ok.

While it's running, take a flashlight and look down the carb throat. You should hear a lot of air noise, but see no fuel going in. If you see fuel dripping into the engine, then you do have a carb problem, and I would rebuild it.

 

I haven't checked the exhaust smell so I will have to look into that.

Next time I have the truck running I will check the carb throat and see if fuel is dripping in. Thanks for the tip, I will remember that for now on.

If anyone has anymore tips feel free to add them.