Having problems with your 1994 BMW 5 Series ?

1994 525i wouldn't start. Replaced fuel switch relay. Started once. Ran well. Wouldn't start again. Created bridge with wire and started. Replaced switch again. same result. Checked fuel pump - OK. Help please

Posted / edited by AnonymousUser on : 23-09-2019

Answers :

If you can hear your fuel pump running when you turn key to ON position, that is a good sign. If you want, you can check the test port on the fuel rail to see if there is pressure going to fuel rail and injectors. If you have good pressure, then it's a spark issue, if the pressure is low, then change your fuel filter and have the fuel pressure regulator tested. Do try and wiggle relay to make sure connections aren't loose. Do the same with the fuse because it is known to happen.
If everything checks out ok here, then you will want to check spark. A very common no start issue is related to faulty crank sensor. This sensor sends a signal from the crank shaft to the ignition module and coil packs, then to plug wires and the finally spark plugs themselves. You can test any relay, fuse, or sensor with an ohmmeter in the ohm setting. You can also go to autozone.com and register for free online repair manual for you vehicle which I recommend to everyone. I find it very helpful and I've been a mechanic for 10+ years.
Repair Help & Product Troubleshooting for 1994 BMW 5 Series

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