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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 08-20-2014, 08:17 PM
roth9773 roth9773 is offline
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Mein Auto: '97 E39 528i
Angry 528i rough idle/missfire only in hot weather

Greetings everyone,

Maybe one of you have an idea. I have 97 528i with 210,000 miles. The car runs amazing except one thing nobody can find. When it gets around 86 degrees plus outside the car starts to run like crap. It idles rough, has no power whatsoever and miss-fires like crazy. And the really weird thing is that it comes and goes. We recently replaced the fan clutch because it was so worn out that the engine started to shake and today I replaced the fuel pump. It runs a wee better but still, when it get around 86 outside it is all rattling and shaking.

Please, does anyone have any idea what might go on?

Oh, check engine light is on with p0440 and yes, it has a brand new gas cap. Can a leak in the evap cause this behavior?

I'm out of ideas!

Martin
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Old 08-20-2014, 08:43 PM
edjack edjack is offline
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http://www.obd-codes.com/p0440
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Old 08-20-2014, 08:45 PM
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helmet75 helmet75 is offline
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it sounds like a vacuum leak, albeit a small one, but a leak just the same.
Also, it sounds like a heat soak issue with the cam position sensor.
I would start there to be honest.
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Old 08-22-2014, 09:07 PM
roth9773 roth9773 is offline
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Mein Auto: '97 E39 528i
Thanks for the tips. I found out today that it is actually the A/C system. The moment I turn the A/C off the things runs like a dream. Now I need to figure out if it is the compressor or something else. The A/C makes a really weird noise though. Almost sure it is the compressor.
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Old 08-22-2014, 09:14 PM
1hander 1hander is offline
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your a/c compressor could be seizing..
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Old 08-22-2014, 09:22 PM
roth9773 roth9773 is offline
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I was thinking the same thing. When it happens the A/C makes a noise like you have a a deck of playing cards mounted on a bicycle wheel. It is actually the quite the same noise and it gets faster with higher rpm. I may swap the hole compressor.
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Old 08-22-2014, 11:06 PM
1hander 1hander is offline
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thats your clutch cycling on and off, i know thart sound very well....i just dealt with it, when i replaced almost my entire ac system and i overcharged the sytem a bit.... its either overcharged, or your seals in the compressor are gone and the r134 has leaked out and its a biit low..

or the bearings are jacked and thats the noise...but i would get on it asap or stop using it, if it grenades your looking at replacing the condensor, evaporator, expansion valve, ..pretty much your entire a/c system will be heavily contaminated beyond cleanability.

get yourself a compressor, expansion valve and a new dryer..and oring kit... its not too hard to do... it took me about 10 hours ... i had a bitch of atime with the expansion valve but the results are awesome ... 41 deg air..
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Old 08-23-2014, 08:52 AM
roth9773 roth9773 is offline
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Mein Auto: '97 E39 528i
Now that you are saying that, since it runs great and also blows cold without any noise below 80 degrees i am going to check the pressure first. It only starts around 86 degrees and is at its worst around 100+. At 110 it is undrivable. I only have the thing a little over a week now so maybe the privious owner overcharged the system big time for some weird reason. But i will 100% change the things you suggested. No harm done in doing so.

Last edited by roth9773; 08-23-2014 at 08:53 AM.
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