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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 12-22-2010, 07:27 AM
bimmerbeal bimmerbeal is offline
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Location: usa
 
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Mein Auto: 1997 740il
98 740iL - Cold start

Hello every one, i have a 98' 740il that WILL NOT START when its colder than 48 degrees. I've gotten a new 900 cca battery, changed the oil and it still spins fast but wont start. Can someone PLEASE tell me whats the problem.
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  #2  
Old 12-22-2010, 08:28 AM
Jaap Jaap is offline
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Mein Auto: e38
Check the ignition system:
- Spark plugs
- Ignition Coils

Do you get any faultcodes?
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  #3  
Old 12-22-2010, 10:31 AM
balance balance is offline
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Mein Auto: 97 740iL
I don't have a clue what the problem is, but does it start if it is hotter than 48 degrees? Does it run good after it starts? And what do you mean "it spins fast", does it turn over faster than normal?

If it turns over faster than normal but doesn't start, that is usually a sign that the timing belt/chain has broken, but that wouldn't be temperature dependent, it would never start. I would pull the fuel line that connects to the fuel rail, turn the key, and see if you are getting fuel to the motor. If no fuel comes out, then you either need a fuel filter, fuel pump relay, or fuel pump.
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  #4  
Old 12-22-2010, 01:06 PM
bimmerbeal bimmerbeal is offline
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Mein Auto: 1997 740il
sorry i changed the fuel filter thinking that could be it....no change..''spins fast'' i meant turns over normal, doesn't drag. when its over 50 the car run like a new car but if i park & it cools past 48, I need a ride. And the fuel pump has lots of pressure.
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  #5  
Old 12-22-2010, 01:10 PM
bimmerbeal bimmerbeal is offline
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Mein Auto: 1997 740il
also i changed the plugs and how do i get the codes, the CEL is on but i dont know where to get it read.
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  #6  
Old 12-22-2010, 02:30 PM
balance balance is offline
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You could get the codes read by anyone who has access to an OBD2 scanner. You could drive to a shop and they would probably charge around $30 to get the codes read, or you could try a few auto part stores and if they still do scans, they will do it for no charge.

If you are sure that there is fuel pressure when the car is not starting, the next thing to check for is spark. You could try pulling a coil and seeing if there is spark, but first scan the computer for codes.

I really don't have a clue what could cause the car not to start when it is cold out. 48 degrees isn't even really that cold. Knowing the fault code that is stored in the system will probably help diagnosis, but I can't think of a fault that would lead to a car not starting in colder weather. Please let us know what you find out.
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  #7  
Old 12-22-2010, 02:55 PM
bimmerbeal bimmerbeal is offline
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Mein Auto: 1997 740il
i went to autozone to get the cumputer scanned & they didnt know where to plug it to the car. is it a special scanner or can you tell me where it is to hook it up?
/
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  #8  
Old 12-22-2010, 03:05 PM
balance balance is offline
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There is a wood trim cover on the OBD2 port that needs to be slid out. The port is on the left of the front cupholders.
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  #9  
Old 12-22-2010, 03:28 PM
bimmerbeal bimmerbeal is offline
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OH ok, about a year ago that cover fell off andi just put it back, never even looked in it. Thankx
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