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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 01-06-2010, 01:26 PM
mhooton mhooton is offline
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Location: n ireland
 
Join Date: Jan 2010
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Mein Auto: 523i
523i very hard to start

I have a 1997 523i which is very hard to start mostly when cold, if i keep cranking for 10 mins or so it will start and run perfect, any suggestions ?
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  #2  
Old 01-06-2010, 01:39 PM
poolman poolman is offline
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Location: martinsville va
 
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Mein Auto: 525i station wagon
Might try the temp sensor thats located on the engine head, that sensor gives the computer the info when to richen up the mixture and go lean when first cranking the car.
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  #3  
Old 01-06-2010, 08:23 PM
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rivercity rivercity is offline
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Mein Auto: BMW 1998 528i
Quote:
Originally Posted by poolman View Post
Might try the temp sensor thats located on the engine head, that sensor gives the computer the info when to richen up the mixture and go lean when first cranking the car.
I would check this and the battery as well......
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  #4  
Old 01-07-2010, 07:52 AM
babis20 babis20 is offline
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Location: London
 
Join Date: Sep 2008
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Mein Auto: 540i & 523i
hello, had exactly the same problem. in the end after trying everything took it to bmw and they did a software reset on the car, that cleared the starting problem. it cost me 140.00
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  #5  
Old 01-07-2010, 11:37 AM
mhooton mhooton is offline
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Location: n ireland
 
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Mein Auto: 523i
Smile starting problem

Thanks for comments , There is 2 sensors in the head just under manifold , which one is for the temp sensor?..... The one nearest front of engine looks new ... the other one has no wires connected, looks like 2 pin... battery is new , so far i have checked fuel pump and fuel lines , changed fuel fliter, pressure rail is fine, ,fuses,relays ,6 plugs etc..this is a prodject car i bought about 4 weeks ago and getting some TLC before it hits the road
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  #6  
Old 01-07-2010, 11:42 AM
mhooton mhooton is offline
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Location: n ireland
 
Join Date: Jan 2010
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Mein Auto: 523i
Smile starting problem

Quote:
Originally Posted by poolman View Post
Might try the temp sensor thats located on the engine head, that sensor gives the computer the info when to richen up the mixture and go lean when first cranking the car.
which one there are 2 sensors under the manifold.
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  #7  
Old 01-07-2010, 01:09 PM
poolman poolman is offline
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Location: martinsville va
 
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Mein Auto: 525i station wagon
The sensor at the back of the engine is the one that the computer reads from. That one doesn't have any wires going to it you stated? If it isn't hooked up that would be a big reason it doesn't crank when cold.
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