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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 07-29-2008, 05:57 AM   #1 (permalink)
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Starting Problem

I have a South African Manufactured 1992 BMW 530i V8. I have never had any starting problems before and the car is well maintained and runs smoothly.

It devloped a water pump leak. I bought a new water pump.

Before getting to work, I pulled the car out of the garage and parked it outside and drained the water. I left it outside overnight while clearing out the garage. Next morning there was a starting issue.

The engine cranked, started, ran for a second or two, then dies. I disconnected batteries, reconnected and nothing. I cranked the motor a number of times and the motor remains dead.

I thought it might be a water level sensor, so I filled up with water. No change.

Every now and then, the motor starts, runs for 2-3 seconds and dies. Then wont start again. I have checked spark, there is spark. There is fuel pressure.

After reading a few posts, It would appear as though it could be the crank / cam position sensor. I have been to the local guys for a bit of help but they want huge prices for workshop manuals and parts.

So, my request is as follows :

1. Any suggestions as to what I could do to narrow down the cause of the problem. I dont want to rush off and buy expensive parts to discover they are the wrong parts.

Is this an issue related to a water level sensor, or an issue related to cam / crank position sensor.

2. Not having ready access to a manual, just a simple description of where the cam / crank position sensors are on the engine, what they plug into and where and how I could unplug / test them without performing major surgery.

3. Any diagnostic tips etc.

4. Any where that I can download a workshop manual.

I am a technical person with a fully equipped workshop and many years experience in rebuilding motors and maintaining my own vehicles. I have oscilloscopes, meters and all the tools. Perhaps if I can unplug the relavant sensors, and look at signals / voltages / impulses and verfy that they are within desired ranges that would help.

I am assuming that the crank / cam position sensor sends an impulse. Is this generated magnetically / optically ? Does the sensor require a bias voltage or is is just a passive pickup with a little magent inside it?

Suggestions, advice would be greatly appreciated.

Thanks very much ... Mike Brink zs6meg
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