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E39 M5 (1998-2003)

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Old 05-22-2011, 03:13 PM
Aki2011 Aki2011 is offline
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Location: London
Join Date: May 2011
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Mein Auto: E39 M5
Unhappy M5 Wont Start , not sure what to try now.

Hi my first Post and really need some advise, I have a 99 E39 M5 that just wont start .

The car was not in use for a few weeks and the Battery went flat, I tried to start it with my booster pack but im concerned i might have flooded it and now it just does not seem to want to catch, i tried to jump start the car but still no luck.

The car tries to start , It sounds like it wants to but just wont ?

My question , what can i do next ,

What i have checked so far.

I checked the plugs they looked quite black and smelt of fuel , I changed the plugs but the car still wont start, I have spark at the plugs ?

I tried to remove the fuel pump fuse to see if the car would start but still no luck ( thinking it might have flooded when i tried to boost start it )

I tried 2 sets of keys and the fault still remains.

Im really lost as what to do ? i think it has been flooded but not sure how to overcome this ? all fuses seem to be ok ?

Please advise if anyone has any suggestions ?

Last edited by Aki2011; 05-22-2011 at 03:15 PM.
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Old 05-24-2011, 12:22 PM
scott0357 scott0357 is offline
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Location: SF Bay Area, CA
Join Date: Nov 2006
Posts: 332
Mein Auto: 2003 530i
you probably need a new battery to give the engine a strong cranking. The M5 needs a lot of juice to start the engine. Jump starting may not help unless the jumper cable is super large. In the past, I tried to jump start the M5 from a 2003 530i with a large jumper cable; the engine wouldn't even crank. However, a new battery got the car started.
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Old 08-01-2011, 05:17 PM
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beewang beewang is offline
Location: Eugene, OREGON, Home to the Rose Bowl Champion
Join Date: Dec 2001
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Mein Auto: S62 E39
The BMW M5 requires a battery that is MUCH more cranking power than the rest of the E39 line. The M5 can NOT be EASILY jump started by normal cars. You would need to have a truck w/ DIESEL engine (i.e. a tow truck) to jump start an E39 M5 with a drained or aged battery.

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