I have a 85 vette that runs very rough when cold. I discovered that there is no fire going to the Thermal time cold start switch except in the starting mode. When the switch is released, the wire going to the thermal switch loses it fire. my question is, is there a relay or what controls the fire going to the thermal switch.
From what I read, the cold start in injector only operates while cranking a cold engine.
I think you need to check f. pump press. & make sure it holds press. when the key is off. An inj. leaking raw fuel will make it run rough. Check your coolant temp. senser for restistence.
Those above are typical room temps(on a cold eng.)
210*f=185 olhms, fully warmed up engine.
i have same problem.just spent 4 months rebuilding everything i could take on and got code for coolant temp sensor[the one under the plenum]. I believe it is the sensor as my cooling fans kick in at startup.this would cause computer to believe the engine is warm and cut power to the cold start injector