1974 1.8L engine fast idle then stalls, Fuel injection issues Options

[tshih914]

My 1.8L 914-4 with stock Bosch L?-Jetronic FI after being stored several years started to develop a hard to start problem. When finally started would stall when I give the gas pedal any input to raise the revs. I suspect there was some kind of intake air leak and while fiddling around had a backfire which blew the AF meter which I had Pelicanparts repaired. After replacing the fuel lines with the stainless ones from Tangerine Racing and flushing out the fuel system with Techron the engine started to run normally for a short time. Now the engine can be started and fast idles at 3000 rpm but again any input to rev up the engine results in stalling. The idle adjustment screw at the base of the throttle housing is fully closed. Any suggestions on how to fix?

[Van B]

Diaphragm is rubber. It gets hard and less flexible, but the spring is what wears out and what causes the required adjustment. Lots of movement and heat cycles over the years.

If you’ve read my thread, I was having high idle issues when running and idle hang when driving.

IMO, you have a whole collection of maintenance issues from deferred maintenance over the years. None major or you wouldn’t even get a high idle and smooth running.

I think your biggest issue is it not taking throttle input.