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?

[nihil44]

I've come in late here and haven't read all of the posts.

Several times I have forgotten to replace the connector on the AFM with the result that it would start normally but stall as soon as you hit the gas. Similar symptoms as described in this post.

Secondly, I had a problem with the car stumbling when I went over a bumpy surface or railroad tracks. I discovered that, although the AFM appeared to be connected, the connector was not seating all the way home and was going intermittently open circuit when disturbed by the bumps

On exploration I discovered that the AFM connector has a rectangular foam rubber seal around the periphery of the row of 7 pin connectors to prevent water ingress but the seal was preventing the connector from fully seating. I removed the seal and the connector clicked fully home. Problem solved.

This might be worth a look

[wonkipop]

I've come in late here and haven't read all of the posts.

Several times I have forgotten to replace the connector on the AFM with the result that it would start normally but stall as soon as you hit the gas. Similar symptoms as described in this post.

Secondly, I had a problem with the car stumbling when I went over a bumpy surface or railroad tracks. I discovered that, although the AFM appeared to be connected, the connector was not seating all the way home and was going intermittently open circuit when disturbed by the bumps

On exploration I discovered that the AFM connector has a rectangular foam rubber seal around the periphery of the row of 7 pin connectors to prevent water ingress but the seal was preventing the connector from fully seating. I removed the seal and the connector clicked fully home. Problem solved.

This might be worth a look

(IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif)
yeah nihil we put him through that test - did not seem to be his problem.

good suggestion however to look at that seal.
his connector will be a 6 pin version.

ah. the joys of prehistoric EFI! (IMG:style_emoticons/default/beer.gif)

by the way, hows your car going mate?
got to get up to brizzy at some stage and drop in on you. (IMG:style_emoticons/default/beerchug.gif)