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D5RSR
Trainee


Joined: 18 Aug 2014
Posts: 78
Location: Leeds


PostPosted: Tue Nov 13, 2018 1:06 pm    Post subject: Slow crank Reply with quote

Sorry, just re-read, you've already replaced it.
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Darren

997.1 C2S
Leeds
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5520
Location: Brighton


PostPosted: Tue Nov 13, 2018 8:00 pm    Post subject: Reply with quote

As with all problems we eliminate what we can and what we are left with is the fault .. either that or there is no fault .

Everyone here has listed what to check .. you tick it off and then move on .

I would like to confirm you have actually replaced the lead from the starter / alternator to the gearbox connection as your first and last post seems to make that a little unclear .. and this is the normal cause of slow cranking .

Soo what do we have .. not battery , leads , alternator , earth straps ..

As long as these have all been checked then you are left with a startermotor or there isnt a fault .

A starter has a solinoid .. its basically 2 bolts with a copper bar that jams against them to pass the current to the motor it self .. this can end up with burning and cause a resistance .. hence a slow crank as not enough current gets past the burnt contacts to give a faster crank ... high resistance.

If thats all we are left with after the checks then thats the fault .. but once again .. thats if there is a fault (i cant see the car ) and if everything else has been checked .

Logical .. and now im praying that it IS the startermotor Smile
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Mezgerite
Silverstone


Joined: 02 Nov 2016
Posts: 145



PostPosted: Tue Nov 13, 2018 8:40 pm    Post subject: Reply with quote

is the cable for most slow crank issues no 13?


https://www.design911.com/uploads/diagrams/997T_2009_9_02_902-05.jpg
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5520
Location: Brighton


PostPosted: Tue Nov 13, 2018 9:07 pm    Post subject: Reply with quote

No 22 but thats a wierd picture .. lead from the starter to the alternaor and to the connection on the gearbox basically.

manual can be done in situe .. Tip and its engine out .
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Mezgerite
Silverstone


Joined: 02 Nov 2016
Posts: 145



PostPosted: Tue Nov 13, 2018 9:31 pm    Post subject: Reply with quote

Thanks,

I have slow cranking and have done the power pin mod converting to a threaded stud which helped a little.

Going to replace the cable next,

2 part no's listed:

22

99760703200

wiring harness starter generator

I249

£116.57


1
22

99760703100

wiring harness starter generator

I480

£109.84
 
  
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Mezgerite
Silverstone


Joined: 02 Nov 2016
Posts: 145



PostPosted: Tue Nov 13, 2018 9:35 pm    Post subject: Reply with quote

99760703100 is for manual,

the other for Tip Smile
 
  
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Wed Nov 14, 2018 3:06 pm    Post subject: Reply with quote

Thanks I've already done that with no improvement unfortunatelt but thanks for the suggestion.

How long would you say the delay is if any, from turning the key to engine running?

My wife's BMW is instant, my 997.1 is about 1 to 2 seconds delay.
 
  
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Wed Nov 14, 2018 4:31 pm    Post subject: Reply with quote

deMort wrote:
As with all problems we eliminate what we can and what we are left with is the fault .. either that or there is no fault .

Everyone here has listed what to check .. you tick it off and then move on .

I would like to confirm you have actually replaced the lead from the starter / alternator to the gearbox connection as your first and last post seems to make that a little unclear .. and this is the normal cause of slow cranking .

Soo what do we have .. not battery , leads , alternator , earth straps ..

As long as these have all been checked then you are left with a startermotor or there isnt a fault .

A starter has a solinoid .. its basically 2 bolts with a copper bar that jams against them to pass the current to the motor it self .. this can end up with burning and cause a resistance .. hence a slow crank as not enough current gets past the burnt contacts to give a faster crank ... high resistance.

If thats all we are left with after the checks then thats the fault .. but once again .. thats if there is a fault (i cant see the car ) and if everything else has been checked .

Logical .. and now im praying that it IS the startermotor Smile


Sorry for the confusion. It was replaced 8 months ago by a dealer. I was going to check nothing has changed or it suffered corrosion in the I months its been on.

Some very helpful advice which is appreciated. Thanks
 
  
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Magic919
Österreich


Joined: 05 Jun 2013
Posts: 903
Location: Berkshire


PostPosted: Wed Nov 14, 2018 6:13 pm    Post subject: Reply with quote

Steve997 wrote:
Thanks I've already done that with no improvement unfortunatelt but thanks for the suggestion.

How long would you say the delay is if any, from turning the key to engine running?

My wife's BMW is instant, my 997.1 is about 1 to 2 seconds delay.


On the 997.2 it’s a short delay whilst it turns over a couple of times, then fires.
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Wed Nov 14, 2018 7:02 pm    Post subject: Reply with quote

Thanks Magic

I'm starting to think it might be typical and normal after you posting that.

What put the thought in my mind was an OPC dealer who did a Health Check said it was lazy starting and compared to my wife's 3 series diesel it is.

It's always took a second or 2 to fire so maybe that's just how the 997 engine is.
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5520
Location: Brighton


PostPosted: Wed Nov 14, 2018 7:04 pm    Post subject: Reply with quote

Aghh ok so this is not necessarily a slow crank but a possible slow to fire up .

If you can .. do a sound clip or a video please so i can confirm if its poor start or slow cranking .. i dont really want to tell you to replace a starter motor when the fault is actually something else .

2 seconds sounds about right but a video will tell me a lot .

Bear in mind when i normally fix cars i have them in front of me Very Happy
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Thu Nov 15, 2018 1:02 pm    Post subject: Reply with quote

deMort wrote:
Aghh ok so this is not necessarily a slow crank but a possible slow to fire up .

If you can .. do a sound clip or a video please so i can confirm if its poor start or slow cranking .. i dont really want to tell you to replace a starter motor when the fault is actually something else .

2 seconds sounds about right but a video will tell me a lot .

Bear in mind when i normally fix cars i have them in front of me Very Happy


Really appreciate that deMort, cheers pal.

Unfortunately I won't have access to the car for a while now so can I post back in a week or two Thumb
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5520
Location: Brighton


PostPosted: Thu Nov 15, 2018 7:33 pm    Post subject: Reply with quote

Post here or email me the video when you are ready .. if you dont have a you tube account and ill upload it and post it here ..

De.Mort@virginmedia.com
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Fri Nov 16, 2018 6:45 am    Post subject: Reply with quote

deMort wrote:
Post here or email me the video when you are ready .. if you dont have a you tube account and ill upload it and post it here ..

De.Mort@virginmedia.com


Definitely will do thanks
 
  
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MisterCorn
Long Beach


Joined: 08 Jan 2011
Posts: 6357
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Fri Nov 16, 2018 7:49 am    Post subject: Reply with quote

There doesn't seem to be a lot of diagnosis going on here. You have a volt meter, have you looked at the following during cranking:

Battery voltage
Voltage between battery - and starter motor -
Voltage between battery + and starter motor +


I would do it by pulling the fuel pump fuse so that I can run it for a good few seconds to get readings. All of this talk of issues with earth or power straps could be confirmed by the above tests. If you are getting a good battery voltage and that voltage is present at the starter motor then it is a motor fault.
If you are seeing significant voltage drops on either the - or the + side then you can further check, such as the voltage from the chassis to the battery - terminal.

I know that slow starter motors are an issue on some models of BMW, so it isn't unheard of.


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Mezgerite
Silverstone


Joined: 02 Nov 2016
Posts: 145



PostPosted: Mon Dec 10, 2018 9:29 pm    Post subject: Reply with quote

I've just got round to fixing mine properly. I decided to change the alternator to starter cable, which also carries the starter solenoid feed. i was getting some clicking from the solenoid so it pointed to this. It was pretty green and corroded looking. I put a new starter in for good measure, and it now cranks very quickly, hot or cold.

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