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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Sat Nov 10, 2018 5:20 pm    Post subject: Slow Cranking Reply with quote

My 997.1 C2S is slow to crank. She fires up ok, but takes about 2 seconds of cranking where other cars I ve driven seem to fire up instantly.

I ve renewed the battery and the starter / alternator lead but no improvement, the car is still very slow to crank over and fire up.

Any ideas?

I tested the alternator with my voltmeter and got the 13.95 volts with the engine running on my C2s.

I tested the wife's BMW and that alternator is putting a more healthy 14.8 volts out.

What do other peoples cars alternators generate? is 13.95 volts normal on a 997 normal / typical ?
 
  
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14478
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sat Nov 10, 2018 5:22 pm    Post subject: Reply with quote

Engine earth strap?
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5535
Location: Brighton


PostPosted: Sat Nov 10, 2018 5:35 pm    Post subject: Reply with quote

Worth checking the power dist pin ..


http://911uk.com/viewtopic.php?t=118716&highlight=power+dist


Also if possible you check the output at the alternator then at the battery .. should be similar.
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Sat Nov 10, 2018 6:26 pm    Post subject: Reply with quote

alex yates wrote:
Engine earth strap?


Cheers Alex.. where is it located ?

Do I need to just heck security and for any corrosion?
 
  
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14478
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sat Nov 10, 2018 6:31 pm    Post subject: Reply with quote

Pass. There's a few threads on here about it if you do a search.
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5535
Location: Brighton


PostPosted: Sat Nov 10, 2018 6:55 pm    Post subject: Reply with quote

To save the search .. yup im bored Very Happy

O/S/R.
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DucatiRob
Barcelona


Joined: 22 Jul 2015
Posts: 1403
Location: Milton Keynes

2006 Porsche 997 Carrera 2S

PostPosted: Sat Nov 10, 2018 7:15 pm    Post subject: Reply with quote

I am starting to get the same issue..again! New battery two years ago so ruling that out, plus voltage is healthy at rest and 13.7-8 at idle! Thinking it might be the power distribution pin as Dermot suggests or the starter motor cable that runs over the engine! Wondering if there is any way to isolate the problem Confused
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Sat Nov 10, 2018 7:36 pm    Post subject: Reply with quote

deMort wrote:
To save the search .. yup im bored Very Happy

O/S/R.


Is that near the coil heat shields and the back box tucked in the rear arch ?

Last edited by Steve997 on Sat Nov 10, 2018 10:53 pm; edited 1 time in total
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5535
Location: Brighton


PostPosted: Sat Nov 10, 2018 7:44 pm    Post subject: Reply with quote

To check the power dist pin .. remove battery leads (always neg lead first ) .. slide the battery to the o/s .. use a long screwdriver to push the red tag down on the positive lead .. it should then with a screwdriver lever out and expose the pin.

You dont have to totally remove the positive lead from the pin as it can be a bit of a pain to refit .. you need to expose enough to see if theres corrosion there ... pin is chrome plated .. if brown its no good .

If theres just a 13mm nut that end then this mod has already been done .

High resistance due to corrosion = slow turn over of the engine on starting .. extreme corrossion will cause flat battery symptoms .

If the lead wont move back and is stiff to turn .. you have problems and need to either folow my guide or get a garage involved .

For the starter cable then remove the throttle body / plenium chamber at the front .. you then have access to the starter .
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Last edited by deMort on Sat Nov 10, 2018 7:48 pm; edited 1 time in total
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5535
Location: Brighton


PostPosted: Sat Nov 10, 2018 7:45 pm    Post subject: Reply with quote

Steve997 wrote:
deMort wrote:
To save the search .. yup im bored Very Happy

O/S/R.


Is that neat the coil heat shields and the back box tucked in the rear arch ?


Didnt understand this question .. coils are behind that heat sheild though .
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DucatiRob
Barcelona


Joined: 22 Jul 2015
Posts: 1403
Location: Milton Keynes

2006 Porsche 997 Carrera 2S

PostPosted: Sat Nov 10, 2018 9:22 pm    Post subject: Reply with quote

deMort wrote:
To check the power dist pin .. remove battery leads (always neg lead first ) .. slide the battery to the o/s .. use a long screwdriver to push the red tag down on the positive lead .. it should then with a screwdriver lever out and expose the pin.

You dont have to totally remove the positive lead from the pin as it can be a bit of a pain to refit .. you need to expose enough to see if theres corrosion there ... pin is chrome plated .. if brown its no good .

If theres just a 13mm nut that end then this mod has already been done .

High resistance due to corrosion = slow turn over of the engine on starting .. extreme corrossion will cause flat battery symptoms .

If the lead wont move back and is stiff to turn .. you have problems and need to either folow my guide or get a garage involved .

For the starter cable then remove the throttle body / plenium chamber at the front .. you then have access to the starter .



Cheers Dermot Thumb will be checking this out!
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5535
Location: Brighton


PostPosted: Sat Nov 10, 2018 9:44 pm    Post subject: Reply with quote

Rob .. young man .. deMort Very Happy
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Sat Nov 10, 2018 10:55 pm    Post subject: Reply with quote

deMort wrote:
Steve997 wrote:
deMort wrote:
To save the search .. yup im bored Very Happy

O/S/R.


Is that neat the coil heat shields and the back box tucked in the rear arch ?


Didnt understand this question .. coils are behind that heat sheild though .


Sorry my fat thumbs miss typed, but yes I meant is that the heat shields hat cover the coil packs. I was trying to get reference point of where under the car it was.
 
  
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Sat Nov 10, 2018 10:59 pm    Post subject: Reply with quote

Some great suggestions of things to try guys. thanks.

I'll be checking the pin and the earth strap next.

Just going back a step. Is 13.95 volts from the alternator (measured at the battery) normal or a little low? Suggesting the alternator is under performing?
 
  
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DucatiRob
Barcelona


Joined: 22 Jul 2015
Posts: 1403
Location: Milton Keynes

2006 Porsche 997 Carrera 2S

PostPosted: Sat Nov 10, 2018 11:28 pm    Post subject: Reply with quote

deMort wrote:
Rob .. young man .. deMort Very Happy




Embarassed spellcheck Surprised Smile
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5535
Location: Brighton


PostPosted: Sun Nov 11, 2018 4:02 pm    Post subject: Reply with quote

It sounds fine at that voltage to me ..

Try checking it under a load to be sure so lights on main beam on heated seats and anything else you have and then see what the voltage is at the battery .. needs to be 13v or higher .

I would normally check at the alternator and then at the battery to see what the difference is .. this will give you an idea of any resistance in the power line .. 0.6 volts and higher is a problem.

Checking at the alternator isnt easy though so just try my first check .

Earth lead in the picture .. o/s/r ( Off Side Rear or right side of the car at the back ).
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Jam911
Barcelona


Joined: 31 Oct 2010
Posts: 1419



PostPosted: Sun Nov 11, 2018 4:16 pm    Post subject: Reply with quote

Is the slow cranking only when hot?
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Tue Nov 13, 2018 8:09 am    Post subject: Reply with quote

No slow cranking is all the time.

I've done some more investigation.

I don't believe it's the battery as it's been replaced for new one.

I don't believe it's the Alternator as still did it with a brand new fully charged battery and the alternator is charging the battery.

It's not a corroded earth strap as I've checked and no corrosion but cleaned anyway.

It's not the power pin as I've checked and no corrosion plus cleaned anyway.

It's not the +'ve cable joint under the car, on the side of the gearbox as again checked and cleaned anyway.

Ran out of time to check the cabling up by the starter but that's my next place to check.

I'm starting to think possibly starter motor is on its way out, but strange as it's done this for at least 8 months and if it was failing surely it would have failed by now.

Does anyone know can a starter motor loose performance if the battery and cabling are all checked good ?

Any other suggestions?
 
  
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Tue Nov 13, 2018 8:10 am    Post subject: Reply with quote

Anyone experiencing similar?
 
  
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D5RSR
Trainee


Joined: 18 Aug 2014
Posts: 78
Location: Leeds


PostPosted: Tue Nov 13, 2018 1:04 pm    Post subject: Slow cranking Reply with quote

I didn't realise I had slow cranking until I replaced the alternator-starter-battery cable earlier this year. I had the slow cranking problem when hot but since replacing the cable the cold cranking speed has also increased dramatically.

Cable replacement is a DIY job but fiddly. I did post a few notes on here when I did it.

Darren.
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997.1 C2S
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