Found something. On the Red blocks the temperature switch initiates the cold start process. If the temperature switch is defective the cold engine would be trying to start on the warm start process. Other components involved in the cold start process are ECU, Frequency valve and Thermal time switch...

I believe this engine will have a cold start injector and cold start relay to provide extra fuel when it is cold. The cold start relay may be bad or the temperature sensor for the cold start system may be bad. Do you have a service manual for this B21F K-jet? Also, if this car sat idle for many mon...

Have you tried re-seating the spark plug cables? It sounds like it could be something simple... or at least, always start with the simple and work toward the difficult. That would be a simple thing to address electrical causes. To do something simple to address combustion, I'd throw 1/3 can Seafoam...

yeah, so technically it's a 244. The shop I bought it from said that the PRV was replaced with a B21 because the PRV's weren't very reliable.

I have a 1976 volvo 264 with a B21F K-jet engine in it. Recently I have been having troubles with starting the car, primarily on cold start. Sometimes on cold start I will turn the key to start and I will hear the engine fire once and then it will die. It will continue to do this multiple times unti...