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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 03-31-2020, 02:45 PM
R3jus R3jus is offline
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Rpm bounce at idle

So i have an e39 528i manual 2000y and i replaced both pre cat o2 sensors, spark plugs, TB gasket, intake manifold gasket, and CCV, and now the rpm bounce at idle, what could be the problem? There are no vacuum leaks... my computer shows bank 1 and bank 2 codes but not always
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  #2  
Old 04-01-2020, 06:26 PM
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mattmar1 mattmar1 is offline
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on your year/model, vanos seals would be the first culprit id look at. what are the bank 1 and 2 codes?
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Old 04-01-2020, 11:04 PM
edjack edjack is offline
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Please explain "Rpm bounce."
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Old 04-02-2020, 01:43 AM
R3jus R3jus is offline
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When i stop at a red light the rpm doesnt stay consistant it bounces up and down almost stalls the engine at idle
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Old 04-02-2020, 01:43 AM
R3jus R3jus is offline
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Fuel trim bank 1 and fuel trimk bank 2
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Old 04-02-2020, 09:43 AM
edjack edjack is offline
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Do you know for sure there are no vacuum leaks?

Have you checked operation of the idle control valve? Item 7: https://www.realoem.com/bmw/enUS/sho...diagId=11_7535

It should rattle slightly when shaken, and buzz in operation.
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Last edited by edjack; 04-02-2020 at 09:51 AM.
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Old 04-02-2020, 03:25 PM
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mattmar1 mattmar1 is offline
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Quote:
Originally Posted by R3jus View Post
Fuel trim bank 1 and fuel trimk bank 2
but what are the codes? those are the definitions.
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Old 04-06-2020, 03:13 PM
R3jus R3jus is offline
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Now im gettin p1250
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Old 04-06-2020, 05:22 PM
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mattmar1 mattmar1 is offline
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im going to add to the list of questions youve not answered as of yet on here....are you reading with a generic scanner? code P1250 is in a manufacturer assigned code block....all valid OBDII codes will start with P0XXX. any code starting with P1XXX or P2XXX are assigned by each specific manufacturer. youve not given the answers to the questions of edjack or myself. you need to get a BMW specific scanner, or have the codes read by a shop who has one.
we're trying to help you. but youve got to help us to do so.
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Old 04-06-2020, 11:11 PM
R3jus R3jus is offline
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Okay thanks for the answer im going to go to a shop to check it out
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