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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 05-12-2009, 05:14 PM   #1 (permalink)
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Jekyll and Hyde syndrome, sometimes runs great, other times not.

Hi, I hope someone out there might have an answer for me. My 2000 BMW 528i with 110K miles has Jekyll and Hyde syndrome. Most of the time, the car starts crisply, accelerates smoothly and runs well. Sometimes it does not turn over smooth, the acceleration is slow and it may stall within 1 - 2 miles of taking off. If it starts well it will run well, if it doesn't it won't.
Any idea what is ailing her?
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Old 05-12-2009, 07:26 PM   #2 (permalink)
OMFG another one!?
 
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Could be a fuel issue. Has the filter been changed?
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Old 05-12-2009, 08:49 PM   #3 (permalink)
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Hi Witeshark, Thanks for taking the time to read and respond to my post. I will give it a try.
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Old 05-21-2009, 08:43 PM   #4 (permalink)
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I installed a new fuel filter on Monday and at first thought the issue was resolved, but unfortunately, it is not. I have stalled one time each day over the last three days. I have noticed that the car seems to stall only when warm. If the car has been sitting overnight or even a few hours, no problem. If I go somewhere, park for a few minutes and then start back up, it seems that is when I am more likely to have a stalling episode. The service engine soon light is on. I stopped by Advance Auto Parts and there are four separate sensor codes, P0340 - Camshaft Position Sensor malfundtion; P0705 Transmission Range Sensor Circuit Malfunction; P0715 Input/Turbine Speed Sensor Circuit malfunction, and P0727 Engine Speed Input Cicuit No Signal. I don't know that it is true, but I was told by a mechanic that when these cars stall, they can throw all kinds of codes, none of which may be the real issue. It was suggested I consider changing out the idle control valve. I would appreciate any thoughts you all might have on this. Thanks.
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Old 06-03-2009, 09:27 PM   #5 (permalink)
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I had gone on a motorcycle meet up the Saturday before last. I had not yet gotten around to trying to do anything with the idle control valve as planned. During the meet up, I met a fellow rider named John who owns a VW/Audi repair shop here locally and who works on BMWs from time to time. I mentioned the symptoms to John who said that it sounded like carbon build up. He suggested I get a bottle of Redline Fuel System Cleaner and dump it in the tank. I found Redline at my local Pep Boys for about $8 and dropped it in the tank the following Monday. I had stalling issues on Monday and Tuesday of last week but none since. It seems this cured the car. I am grateful to John for the advice and suggest if you are experiencing similar problems you give Redline a try. It is the best $8 investment I've made. * PS. Witeshark you were right all along. It was a fuel issue.
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Old 06-03-2009, 09:37 PM   #6 (permalink)
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Interesting when it's something simple like that, glad that it's sorted!
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Old 06-03-2009, 10:58 PM   #7 (permalink)
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try to clean the throttle body.

I agree that it might be carbon build up.

Try a hot soak while you are at it.

If those dont work I would check vacuum hoses throughout the engine bay. That will usually cause idle/stall problems randomly(if you hit a bump and the rubber comes apart a little letting the vacuum change)

Just some ideas.

Throttle position sensors will go out around that mileage. Should not be causing said symptoms, but it is good to change it since the car is running in limp mode. (not as much power)

*edit* just read the rest of the thread...heh. Might still want to do a hot soak. And still check the camshaft position sensor if your Check engine light it out.
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