Engine Cutting Out Again, Severe Miss Options

[PDXBob]

Hi 914’ers,
This is a revival of my old post about the same engine cutting out problem on my 1975 914 (1.8L). It cuts out generally after warmed up and driven for a while. Usually happens under load, like when I’m going up a hill. Doesn’t miss on idle or when I rev it up in the driveway. Based on the work I’ve done so far I’m now thinking must be fuel related.

Here’s an (unfortunately) long list of what I’ve checked or replaced:
- new Spark Plugs and wires,
- new 123Ignition distributor, coil and distributor cap
- no vacuum leaks, all ground wires appear in contact and good shape.
- ECM wiring appears good and I’ve tried wiggling its wires to see if any faults
- Tested the TPS and it’s good, also AFM flap moves smoothly.

A couple of other interesting things- I didn’t drive it for about 2 months, and after installing new distributor it ran great for about 2 weeks. Also, on Friday it was cutting out bad, then I stopped at a store for about 1/2 hour and when I restarted and drove home the cut out had disappeared.

So, I’m now think fuel system related.
Any ideas would be greatly appreciated!
PDXBob

[mgphoto]

What I personally found is that the issue is electrical, fuel or ignition, if the engine back fires then it’s ignition as fuel is still being introduced into the cylinders if there isn’t any back fire than it’s fuel interruption. Most often it’s something simple like a loose connection, you mentioned that the engine ran fine after you installed the 123 dizzy, that is a clue. Good luck.

[emerygt350]

What I personally found is that the issue is electrical, fuel or ignition, if the engine back fires then it’s ignition as fuel is still being introduced into the cylinders if there isn’t any back fire than it’s fuel interruption. Most often it’s something simple like a loose connection, you mentioned that the engine ran fine after you installed the 123 dizzy, that is a clue. Good luck.

There is an exception to this... the combination of the two. When your TPS malfunctions the ECU cuts all injectors, so an electrical issue resulting in a fuel issue and no backfire...