L Jetronic FI, Idle Good, WOT Not Good, But Only Sometimes! Options

[Cjllong]

Alright,

I have L-Jetronic FI and the motor starts and idles. When I hit the gas, it dies at a certain RPM. I'm no stranger to the FI in my car and I have diagnosed many problems, but this one is killing me. The mystery is.... Sometimes it runs like a top, other times it dies. About a month ago, it died at the curb in front of my house. Today, I took it for a ride and it died at the curb again. I took apart the throttle body and checked the Throttle Switch.... it's good. I checked all the other components... All good! I fired it up.... Damn thing ran like a top all over town! I didn't do anything different! I'd like to think I fixed it, but I'm not that good! Any ideas on how to find the actual problem and make it reliable?

Chris

[zonedoubt]

I have been encountering some stumbling on slow increase of throttle the past couple weeks. Today I popped the cover off the air flow meter and found that the AFM flap "rotor" (not sure what it's called -- I labelled it "2" in the photo below) was catching on the fuel shut off contact arm (labelled "1"). I bent it back to where it should be and observed that it was clearing OK when applying throttle.

I'm not sure how the contact arm bent in the first place, maybe was riding a bit close to the rotor.

Having the cover off the AFM is a good way to visually check that things are working as they should in the AFM (at least mechanically). Just don't mess with the adjustment screws. (IMG:style_emoticons/default/wink.gif)