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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 11-20-2011, 03:12 PM   #1 (permalink)
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e34 540i running rough then conking out...

G'day guys,

I had my first real hiccup with my e34 540i the other day. It was a warm, humid day and I had just driven about 50km heading home after work. I had been driving through nearly peak hour traffic and there was much stop-go driving, and a few stretches of very low speeds. As I drew up to an intersection, the engine started to run very rough. I gave the car a little throttle and then the engine lost power and the car effectively came to a halt. I put the car back into park, cranked the engine and she started. I then put her into drive and she conked out again. Prior to all this, there were no warning lights, no elevated temperatures, nothing to indicate anything was amiss.

I had the car loaded onto the back of a truck and had it dropped off at home as I wasn't willing to risk limping home in case there had been some sort of catastrophic failure. The next day I started her up and gingerly took her for a drive around the block and found nothing wrong with her. Last night, I drove to and from work, 100kms in total and could not replicate the fault. Any ideas as to what may have caused this little glitch?
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Old 11-21-2011, 01:57 AM   #2 (permalink)
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Possibly some sort of fuel system related issue. I am not sure that you'd call it vaporisation like in the carby days, but something similar. If it soes happen again, try popping the hood and letting it sit for 10 - 15 minutes and see if it spring back into life.

How many kms on it? Maybe the fuel pump is a little low on pressure, or the pressure reg isn't holding the fuel rail pressure at the right level.
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Old 11-21-2011, 02:20 PM   #3 (permalink)
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My first thought was vaporisation too; that's exactly what it felt like - but I then immediately thought "no, it's injected, vaporisation is pretty much impossible".

The car has 216,000 kms on it. It's not a young car, but it's always been well taken care of. It's due for a service soon so I'll be sure to let the mechanic know about this little hiccup.
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Old 11-25-2011, 07:27 AM   #4 (permalink)
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Originally Posted by brettski View Post
Possibly some sort of fuel system related issue. I am not sure that you'd call it vaporisation like in the carby days, but something similar. If it soes happen again, try popping the hood and letting it sit for 10 - 15 minutes and see if it spring back into life.

How many kms on it? Maybe the fuel pump is a little low on pressure, or the pressure reg isn't holding the fuel rail pressure at the right level.

Mechanic friend of mine told me that fuel pump failure in BMW's was a fairly common occurrence
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