1987 BMW 325is Dies during normal operation

https://www.automobile-catalog.com/car/1987/266795/bmw_325.html

Here is the information you are looking for

You can check this website

https://www.autogenius.info/bmw-3-series-e30-325i-convertible-325is-325ix-fuse-box-diagram-us-version-1987-1991

You most likely have an engine vacuum leak or a defective mass airflow sensor or low fuel pressure. Read the codes with a OBD2 code reader and see what the standard codes are.

P1250- PRC Solenoid Circuit Malfunction, could be a problem with you fuel pressure regulator, i would check the pressure of the fuel rail with a fuel pressure gauge depending on what BMW you own fuel pressure spec it different.E39s are supposed to have 50 +/-2 psi of operating pressure

Check fuel pressure. Have you replaced the fuel filter on schedule? Verify that the fuel pump is getting power. Power goes through an in-line fuse, then the fuel pump relay or the oil pressure sensor. (The relay bypasses the oil pressure sensor while the engine starts, but fuel pump power goes through the sensor during normal run operation. If you lose oil pressure, the fuel pump is shut off to protect the engine.) On four-cylinder models, the fuse is in the fuse block (E PUMP 10)
The fuel injectors are connected to the ECM fuse on one side and straight to the engine computer on the other side. Check the connectors and wiring, especially at the injector.

Hi,
Did you done some timing on your ignition?
Sounds like the ignition got problem in firing order and timing sequence.
Check on that first, then we'll be glad to answer more problem to help you in that already classic model!
Thanks for using Fixya!

hello Murray
try to check your second fuel pump condition-delivery,but start with checking your fuel pumps relays
it the front trunk.The relasy should be RED not BLACK typeTo change the fuel filter is a good idea,on the filter is a date of manufactured,filter should be replaced one a year.
trubka

You need a new fuel pump relay. The engine fires up and runs off the oil pressure switch untill the oil pressure PSI is reached at normal operating conditions. When the oil pressure reaches its operating PSI the PCM or engines computer will shut off that circuit and turns on the fuel pump relay to run the fuel pump untill you shut the engine off

On this website you find fuse box diagram and description for BMW 3 series (1987 - 1991)

https://www.autogenius.info/bmw-3-series-e30-325i-convertible-325is-325ix-fuse-box-diagram-us-version-1987-1991

The number one problem with these cars is with clogged fuel filters. They must be changed regularly. When you say it won't start, do you mean it cranks but won't fire? That could be a fuel pressure problem due to a clogged filter.