luderchris
Bronco Guru
Haven't run codes yet since I switched the hoses around, but it runs the same. I'll check to see if the 41/91 o2 codes are gone. The new BP sensor did get rid of the 22 code though.
where does the hose on the throttle body 90 degree fitting go to?? I think its picture2
Randy,
He moved it. It was connected to PCV valve on driver's side valve cover. Now it goes to oil filler neck port.
Rich
From my research, I don't believe my set up combo, including the 65 mm throttle body, should be a problem. Is that the consensus?
Your EEC has already told you what the issue is. You have a fuel scheduling issue. It is either the aftermarket maf or the O2 sensors
If its not stock it could be a problem.
A dyno tune can take care of it.
I like to start with a stock setup , debug it then add the fancy shit, that way you know its right and where the problem is.
Have you checked to see if the O2 connectors are going to the correct O2 sensors? You might have them swapped.
No. That is my next step after borrowing a different MAF to try.
Just for my own knowledge, why does left/right O2 sensors matter to the computer? Does it correspond to the side of the engine it is monitoring?
Because the computer is looking at O2 sensors and making fuel trim adjustments. If it sees a lean condition on one side and tries to richen up the other side because the harness connectors are swapped you still have problems and the computer won't know it. You don't have to swap the sensors to test it, just the connectors.
I suggest you tend to the O2 sensors first, then the MAF.
FWIW- I think that may possibly be a Cardone reman MAF sensor p/n 74-9502 which is a match for the 91 Mustang 5.0. That being said, it is too much a risk, especially when troubleshooting a problem like this, to make such an assumption.