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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 Yesterday, 11:58 PM
03-525iBMW 03-525iBMW is online now
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Join Date: Jun 2016
Posts: 10
Mein Auto:
Rough idling

My 2003 525I has been idling roughfor bout two days. I thought maybe I had put bad gas n pumped some high octane gas from shell but the problem continued. I had a diagnostic test done at autozone n they said my #5 spark plug needed replaced. I plan on replacing all 6 but I ordered the plugs online so for the mean time I bought the 1 plug to replace the #5 till the plugs come. Also prior to this I had no check engine light but now it's on. I had no clue which plug was #5 so I did a lil research online n seen that the plug underneath the oil cap is #2 so the 2nd to last towards the windshield must be #5 n replaced it w the recommended spark plug from autozone. Still the car idles the same. Were did I go wrong? 1st beemer I ever owned n first car i ever worked on . Can someone plz help. Am I suppose to reset something? Any advice is good.
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  #2  
Old Today, 12:07 AM
edjack edjack is offline
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Location: San Jose, CA
 
Join Date: May 2007
Posts: 12,322
Mein Auto: '97 540i 6 speed
Beemers are motorcycles, and, as such, have two cylinders.

Bimmers, OTOH, can have many more cylinders. The 525i has six cylinders. Number 1 is at the front of the engine, and number 6 is at the rear.

Get the codes read again, and report back.
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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  #3  
Old Today, 12:42 AM
03-525iBMW 03-525iBMW is online now
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Mein Auto:
So then I did replace the correct spark plug but the car still runs the same. I replaced the #5 cuz thats what the autozone diagnostic said to replace. Was I suppose to do anything else? Like unplug the negative post on the batteryvor something for a reset on the check engine light? But like I said the car still idles rough. Am I suppose to let it run awhile....idk.....
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  #4  
Old Today, 12:44 AM
03-525iBMW 03-525iBMW is online now
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Mein Auto:
By the way thanks for clearing the bimmer n beemer thing. Save me some confusion in the future
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  #5  
Old Today, 04:40 AM
BennyT BennyT is online now
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Location: Ohio
 
Join Date: May 2015
Posts: 48
Mein Auto: 01 525i
Move your #5 ignition coil to another cylinder and have the codes read. Sounds like you might have a bad coil. If that one's bad, the cylinder misfire code will follow it. While you probably could benefit from a plug change, I kinda doubt that's your problem.
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