528i E12 start problems

528iE12 · Post by **528iE12** » Sat Feb 02, 2013 8:00 am

The engine hasn't been running in very many years, and it doesn't start because the injectors are not opening, only the cold start valve. I have changed 2 relays next to the brake cylinder and the control unit for the injection, both things are used. What is wrong? If I take 2 wires direct from the battery to the injectors, I can hear they are opening.

JodyStevens · Post by **JodyStevens** » Sat Feb 02, 2013 10:48 am

Are you sure you are getting fuel to the engine? Could be a bad pump or cracked hoses.

528iE12 · Post by **528iE12** » Sat Feb 02, 2013 2:01 pm

JodyStevens wrote:Are you sure you are getting fuel to the engine? Could be a bad pump or cracked hoses.

Yes, the pressure is ok and the fuel is new, but the injectors are not opening. it starts but stops after a few seconds because the cold start valve is opening. So everything is fine without the injectors that don't get power to open.

Robert Bondi · Post by **Robert Bondi** » Mon Feb 04, 2013 3:05 am

Have you inspected the ignition control unit and power resistors over by the
washer fluid reservoir?

I'm assuming the relays you mentioned by the brake cylinder includes
the combination relay (has two separate plugs)...

528iE12 · Post by **528iE12** » Wed Feb 06, 2013 4:35 pm

The problem is found! It's a broken wire to the combo relay. When the engine is cranking, is only the cold start valve opening. When it fires is the other injectors activated of the wire that is broken. So i made a wire from the relay to the ignition lock, so when i turn the key, the injectors are opening and now it's running again after many years!:)
Than you for help:)

Jeff Dennis · Post by **Jeff Dennis** » Wed Feb 06, 2013 8:46 pm

Does this bypass the combo relay now?

528iE12 · Post by **528iE12** » Sun Mar 31, 2013 7:25 pm

Jeff Dennis wrote:Does this bypass the combo relay now?

The wire goes to the input to the relay, so it doesn't bypass. But where is this wire coming from?

Jeff Dennis · Post by **Jeff Dennis** » Mon Apr 08, 2013 10:35 pm

So you are taking power from the ignition to the input of the relay with a new wire? If I read you correctly?

528iE12 · Post by **528iE12** » Wed Apr 10, 2013 12:44 pm

Jeff Dennis wrote:So you are taking power from the ignition to the input of the relay with a new wire? If I read you correctly?

Correct:)