Engine leans out over 2400 rpm

[Cruzzar]

Eureka!!!!!!!!  One of the first things that showed a possible problem when I first ran into this problem was my AFM so I replaced it with a rebuilt one but checked it before installation. I tried increasing the fuel pressure as suggested by Siteunseen with no improvement. I was just about to pull the ECU plug and go over the testing procedures to see if I missed anything but instead I called a friend of mine who has some Z stuff to see if he had an old AFM that I could install and see if it made any difference.       W E L L L L L L L L L ------- I  install this  used, grungy one from a friend  this afternoon and it WORKS!!!  It is not the first time I have ilnstalled a rebuilt item and it didn't work correctly. I don't know what the issue was with the rebuilt one, I had examined the carbon track and it look perfect, it could be the batch of resistors for that portion could have been bad or not the correct resistance because I had already done the FSM's suggested checks on it as a precaution before I installed it. Applying the 12v and looking for reducing voltage as you move the air vane didn't show me anything unusal. Anyway thanks to all who have given me suggestion. I guess if anything I have become a better informed owner which I don't mind. This is no my first rodeo working on car but this issue was driving me nuts because it was not making sense and many of you out there have a tremendous knowledge base with these cars. Will post pictures if I can figure out has to do that when I get it all cleaned up, licensed, insured and on the road.

[Captain Obvious]

Or.... My next thought is that maybe there's something wrong with your AFM.  Hahaha!!!

9 hours ago, Cruzzar said:

 It is not the first time I have ilnstalled a rebuilt item and it didn't work correctly.

Yeah. me either. Glad you got it working. And all the other work you did will only help moving forward. So were the numbers on the rebuilt AFM correct? Was it the "right" AFM for the year and all?

[240260280]

Could also be connector or wiring under afm or even afm ground wire

[Cruzzar]

I did make sure the wire ring was clean and made a good ground after I installed it. Do you think there is one wire or are more than one that transmits the varied resistances to the ECU based on the vane position? I did try to clean the female connector but I can't say I did a good job. Does anyone have a good way to cleans in between the metal connectors? I gave up on trying to clean up the injector connections and just replaced them. They were covered with green calk-like corrosion.

[Mark Maras]

11 hours ago, Cruzzar said:

 I did try to clean the female connector but I can't say I did a good job. Does anyone have a good way to cleans in between the metal connectors? I gave up on trying to clean up the injector connections and just replaced them. They were covered with green calk-like corrosion.

 Deoxit works well on corroded connections.