1984 Chrysler Laser - Non-Turbo - Throttle Body Injection
What I know so far:
No engine fault codes
AIS Motor works
Vacuum lines have all been replaced
Brand new spark plugs
Ambient temperature above freezing when troubleshooting
No EGR valve (not sure if relevant)
No pre-heat hose (not sure if relevant)
Runs perfectly smooth when warmed up
When the car is cold I have to crank the engine for several seconds until I hear one cylinder fire. After one cylinder fires, it immediately cuts out and does not continue to fire. I then stop and wait a few seconds and repeat the process, holding the ignition on until another cylinder fires and then waiting a few seconds and trying again. I repeat this process for several minutes. Eventually all cylinders fire and the car will run for a second or two and die. I have to fight with that a few times or hold down the accelerator pedal to keep it running. Then it warms up enough to stay on by itself. Once warm, it runs absolutely perfect. I can also turn it off and turn it right back on. If I turn it off and wait several minutes it will still turn right back on.
I removed the EGR valve after installing an aftermarket exhaust manifold. I do not know if this is relevant.
I also had to remove the pre-heat hose that runs from the factory exhaust manifold to the air box. I understand that this hose feeds heated air into the engine to improve cold engine performance, but that shouldn't matter when first turning on the car, as the manifold is initially cold to begin with.