Way too much gas, 73 1.7 with FI Options

[EJP914]

hello!
Looking for some ideas on why the spark plug electrodes are wet with gas after running the car for only about 20-30 seconds. Something is causing way too much fuel into the engine. Car starts at the turn of the key, but stumbles and runs rough. Exhaust smells like gasoline.

I have checked, replaced, or installed known good parts.
New plugs, points, condenser.
Cleaned trigger contacts. Distributer other wise works as it should.
Swapped in known good relay board and relays
Swapped in known good ECU.
Installed new fuel injectors, Standard Mfg type.
Fuel line pressure at 25 lbs.
Swapped in “adjusted” MPS. (Maybe still too rich?)
Timing is good but not spot on.

I have not yet checked CHT sensor or cold start valve (may be stuck open?). Not sure what else to check? I have never seen this much gas get pumped into an engine.
I would very much appreciate any advice and/or guidance. Thanks.

EJP914

[JamesM]

Swapped in “adjusted” MPS. (Maybe still too rich?)

I have not yet checked CHT sensor or cold start valve (may be stuck open?).

Those are the three, but im leaning towards the MPS.


For the cold start valve to be stuck open it would first have to open which takes either very cold temps, or a grounded out wire to TS1. Quick test, you could try unplugging the injector but I doubt that is your issue.

CHT failures usually result in a no run condition. Rich to the point of having to floor it to keep it idling.