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-   -   2006 X5 Diesel intermittent cold start problem (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/80023-2006-x5-diesel-intermittent-cold-start-problem.html)

srmmmm 01-29-2015 11:55 AM
Remember that at lower temps, your battery does not deliver the same amount of power and as the voltage drops during cranking, the amperage draw will increase to make up for it. As for glowplug use, I wouldn't be surprised to learn that they kick in for a few seconds even on a "cool" start. You might try disconnecting them if there is a relay you can take out of the circuit temporarily to be sure you're only seeing the amp draw from the starter.

2002 X5 3.0 271,100 miles
2004 325i 118,000 miles

omodos 01-29-2015 02:18 PM
Quote:
Originally Posted by srmmmm (Post 1025636)
Remember that at lower temps, your battery does not deliver the same amount of power and as the voltage drops during cranking, the amperage draw will increase to make up for it. As for glowplug use, I wouldn't be surprised to learn that they kick in for a few seconds even on a "cool" start. You might try disconnecting them if there is a relay you can take out of the circuit temporarily to be sure you're only seeing the amp draw from the starter.

2002 X5 3.0 271,100 miles
2004 325i 118,000 miles

thanks again fella, point regarding volts drop meaning higher amps draw to make up for this does make sense read somewhere it should not drop to less than 9.6v during crank so say for arguments sake it does drop to this then

to generate the starters 2000watts output it will need to draw about 208amps 208 X 9.6 =2000

Soooooo 208amps max draw on start, and any lower than 9.6v on crank well I doubt it will crank over....I will dig further around aregarding glowplugs and am waiting for a fella in the uk with the same issue as me to get his looked at tomorrow and get starter replaced....we shall see, thanks for replies

omodos 01-29-2015 02:31 PM
Quote:
Originally Posted by srmmmm (Post 1025636)
Remember that at lower temps, your battery does not deliver the same amount of power and as the voltage drops during cranking, the amperage draw will increase to make up for it. As for glowplug use, I wouldn't be surprised to learn that they kick in for a few seconds even on a "cool" start. You might try disconnecting them if there is a relay you can take out of the circuit temporarily to be sure you're only seeing the amp draw from the starter.

2002 X5 3.0 271,100 miles
2004 325i 118,000 miles

thanks again fella, point regarding volts drop meaning higher amps draw to make up for this does make sense read somewhere it should not drop to less than 9.6v during crank so say for arguments sake it does drop to this then

to generate the starters 2000watts output it will need to draw about 208amps 208 X 9.6 =2000

Soooooo 208amps max draw on start, and any lower than 9.6v on crank well I doubt it will crank over....I will dig further around aregarding glowplugs and am waiting for a fella in the uk with the same issue as me to get his looked at tomorrow and get starter replaced....we shall see, thanks for replies

Rexnest 10-28-2019 07:54 AM
Same crank but no start issue
 
I've had exactly the same symptoms on a E53 X5 getting gradually worse over the winter months but clearing up in the summer.
Changed the Fuel Pump relay above the fuse board yesterday, came out to the coldest morning of the year so far and it fired up first time, without hesitation. For the sake of a fewŁ relay and half hour of my time, I was well happy :rofl:


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