L-jet help needed Options

[wanchaiwarrior]

74 1.8L L-jet was running well before I decided to give the engine a good cleaning and replace all the old vacuum lines. Now it idles great, but as soon as I go beyond 1/10th throttle it just losses all power. At low throttle it will run all the way to 4,000+RPM. But beyond a certain throttle position, regardless of RPM, it just goes limp.

2 months ago I performed a full tune, including valve adjust, pertronix, plugs, rotor, cap. I have triple checked my vacuum hose connections and electrical connections. I even pulled the throttle body off and checked the TPS operation, which appears to be operating properly. Oddly, my throttle body only has one port that goes to the back side of the vacuum advance diaphragm leaving the port on the front of the vacuum advance open.

It definitely seems to be related to throttle position.

Not sure where to try next. Any suggestions would be greatly appreciated.

[wanchaiwarrior]

I opened up my air flow sensor and discovered the problem. The center tab connection had somehow twisted to the side and was no longer making contact with the center pole. If you look closely you can see the arrow pointing to the copper tang.

Now the car is running like a top!! I'm so happy (IMG:style_emoticons/default/cheer.gif)

[Brando]

To address this issue later on in Motronic cars, Bosch ran a ground wire from the wiper bridge to the wiper. It prevents issues like this from happening.

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.efinnegan.com-2648-1272868011.1.jpg)

More info on AFM rebuilding & diagnostics here.

I opened up my air flow sensor and discovered the problem. The center tab connection had somehow twisted to the side and was no longer making contact with the center pole. If you look closely you can see the arrow pointing to the copper tang.

Now the car is running like a top!! I'm so happy (IMG:style_emoticons/default/cheer.gif)