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Old 10-03-2021, 06:09 PM
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Random question about key cranking

Hi everyone! Decided to pull my 4.6 out of the garage and start using it since itís time to put away my e39 Iíve always noticed that when I start my M5 I have to hold the key while cranking until it starts versus with the X5, I just turn the key once, let it go and it cranks on its own until the engine fires up. Does anyone have more info about that, or if other models do it as well? Itís just one of the many interesting quirks Iíve always wondered about..


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Old 10-03-2021, 06:25 PM
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Originally Posted by Davelaz23 View Post
Hi everyone! Decided to pull my 4.6 out of the garage and start using it since itís time to put away my e39 Iíve always noticed that when I start my M5 I have to hold the key while cranking until it starts versus with the X5, I just turn the key once, let it go and it cranks on its own until the engine fires up. Does anyone have more info about that, or if other models do it as well? Itís just one of the many interesting quirks Iíve always wondered about..
This automatic start control (or convinient start) is implemented on engine control unit of V8 engines (start motor activation via separate relay). I think E39 M5 should have it too.
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Old 10-03-2021, 09:14 PM
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Year of the m5?
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Old 10-04-2021, 12:40 PM
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Originally Posted by Clavurion View Post
This automatic start control (or convinient start) is implemented on engine control unit of V8 engines (start motor activation via separate relay). I think E39 M5 should have it too.


Very interesting thanks for the info! Iíll have to try again but Iím almost 100% positive my e39 wonít do it. Iím now curious if this was a quirk that BMW felt like throwing in or if this was for any particular reason


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Old 10-04-2021, 12:40 PM
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Year of the m5?


2001


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Old 10-04-2021, 12:41 PM
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I think the feature has always been on the X5 so it is surprising not M5 same vintage. Look in your manual see if it's mentioned in each.


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Old 10-04-2021, 01:14 PM
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I think the feature has always been on the X5 so it is surprising not M5 same vintage. Look in your manual see if it's mentioned in each.


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Ok all figured out. Convenience starting feature is only on 8 cyl models with automatic transmission. It appears in the manuals for both the e53 v8, and e39 540iA manuals. Specifically notes for automatic transmissions only, which is why itís not on my M5.


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Old 10-04-2021, 02:08 PM
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Originally Posted by Davelaz23 View Post
Ok all figured out. Convenience starting feature is only on 8 cyl models with automatic transmission. It appears in the manuals for both the e53 v8, and e39 540iA manuals. Specifically notes for automatic transmissions only, which is why itís not on my M5.
I knew this feature on other V8 models was on automatic version only (no separate start relay on manual models). On wiring diagrams M5 (MSS52) has a separate start activation relay (same one which controls automatic start) but the function seems to be just to prevent starter activation if clutch pedal is not depressed.
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Old 10-04-2021, 06:54 PM
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Mystery solved good job


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