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Simmokj
Newbie


Joined: 08 May 2018
Posts: 38
Location: Cheshire


PostPosted: Fri Sep 07, 2018 5:54 am    Post subject: A new 997 problem perhaps? Reply with quote

Hi all

Recently I’ve had a strange issue with my 997 cab. Normally a quick Google shows some kind of resolution /explanation, but even an in depth google has turned nothing up for me this time.

She fires up fine and drives normally, however when the engine temp is nearing to warm, the temp then drops. If I pull over and idle for a few minutes then the engine reaches warm and all is fine. If I don’t however, then the temperature indicator will fail.

Does anyone have any ideas?
 
  
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Poker2009
Imola


Joined: 09 Sep 2009
Posts: 867
Location: London


PostPosted: Fri Sep 07, 2018 5:57 am    Post subject: Reply with quote

Faulty oil-level sender, probably intermittent.

Or you may have a bit too much oil in the engine.
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997.1 C2S, Black, Feb 2005: tiny IMS bearing, 60k miles, original engine.
 
  
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Simmokj
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Joined: 08 May 2018
Posts: 38
Location: Cheshire


PostPosted: Fri Sep 07, 2018 6:02 am    Post subject: Reply with quote

Hmmmm. Ok, would the oil check on ignition start tell me that, it says that the levels are fine, or could that perhaps be the problem?
 
  
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Magic919
Imola


Joined: 05 Jun 2013
Posts: 869
Location: Berkshire


PostPosted: Fri Sep 07, 2018 6:07 am    Post subject: Reply with quote

Which temp gauge?
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Poker2009
Imola


Joined: 09 Sep 2009
Posts: 867
Location: London


PostPosted: Fri Sep 07, 2018 6:08 am    Post subject: Reply with quote

You should have the very top segment empty on the oil level check.

But if it is faulty, it maybe giving an incorrect reading.

If everything else is normal, I would wait and see if it goes away.

I had a similar problem (needle would just drop even the the car was fully warm), but now I think I was just over-filling oil by a bit too much. But I also switched from Millers EE to Millers NT, and the problem went away!
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997.1 C2S, Black, Feb 2005: tiny IMS bearing, 60k miles, original engine.
 
  
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Simmokj
Newbie


Joined: 08 May 2018
Posts: 38
Location: Cheshire


PostPosted: Fri Sep 07, 2018 6:09 am    Post subject: Reply with quote

Which temp gauge is failing? It’s the engine temp gauge. The sensor was replaced a couple of weeks back in case it was the sensor, but no. Still happening.
 
  
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Poker2009
Imola


Joined: 09 Sep 2009
Posts: 867
Location: London


PostPosted: Fri Sep 07, 2018 6:10 am    Post subject: Reply with quote

Water or oil temp?

I have assumed oil temp?
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Simmokj
Newbie


Joined: 08 May 2018
Posts: 38
Location: Cheshire


PostPosted: Fri Sep 07, 2018 6:41 am    Post subject: Reply with quote

This one Smile
 



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Poker2009
Imola


Joined: 09 Sep 2009
Posts: 867
Location: London


PostPosted: Fri Sep 07, 2018 6:42 am    Post subject: Reply with quote

Sorry that is water temp - ignore everything I said!!
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Phil 997
Brands Hatch
Brands Hatch


Joined: 05 Dec 2015
Posts: 14429
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Fri Sep 07, 2018 7:50 am    Post subject: Reply with quote

Have you tried the simple checks eg have you got an air lock in the water somewhere . Question
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Others Enjoy The Moment Today.
 
  
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rob001
Silverstone


Joined: 13 Jan 2011
Posts: 113



PostPosted: Fri Sep 07, 2018 7:57 am    Post subject: Reply with quote

Maybe the coolant thermostat is a bit stuck and then suddenly opens to full when nearing operating temperature?
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ex Basalt black 996TT K16/24, 5bar FPR, FVD DV, 100 cell Europipe, UMW tune
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corriepups
Newbie


Joined: 07 Oct 2014
Posts: 4



PostPosted: Fri Sep 07, 2018 10:24 am    Post subject: Reply with quote

Is it a tiptronic? If so sounds like your transmission coolant circuit is opening.
Either disc valve or control unit faulty. Both easy fix
 
  
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redbaron1973
Trainee


Joined: 10 Sep 2017
Posts: 65
Location: Lancashire


PostPosted: Fri Sep 07, 2018 11:47 am    Post subject: Reply with quote

Mine moves slightly temp wise when the thermostat opens - its more noticeable with a LTT - or seems to be.
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997.1 C2S
 
  
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Simmokj
Newbie


Joined: 08 May 2018
Posts: 38
Location: Cheshire


PostPosted: Fri Sep 07, 2018 12:52 pm    Post subject: Reply with quote

Phil 997 wrote:
Have you tried the simple checks eg have you got an air lock in the water somewhere . Question


Would burping the system help here then? I believe there’s a simple way
 
  
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Simmokj
Newbie


Joined: 08 May 2018
Posts: 38
Location: Cheshire


PostPosted: Fri Sep 07, 2018 12:53 pm    Post subject: Reply with quote

rob001 wrote:
Maybe the coolant thermostat is a bit stuck and then suddenly opens to full when nearing operating temperature?


Sounds feasible. Any idea how to fix that, I’d give anything a go as it’s starting to annoy me
 
  
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Simmokj
Newbie


Joined: 08 May 2018
Posts: 38
Location: Cheshire


PostPosted: Fri Sep 07, 2018 12:55 pm    Post subject: Reply with quote

corriepups wrote:
Is it a tiptronic? If so sounds like your transmission coolant circuit is opening.
Either disc valve or control unit faulty. Both easy fix


Yes corriepups. It’s a tiptronic, I’ll look into this. Would it affect the temperature then or just the sensor?
 
  
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corriepups
Newbie


Joined: 07 Oct 2014
Posts: 4



PostPosted: Fri Sep 07, 2018 1:19 pm    Post subject: Reply with quote

It is the actual coolant temp drops when the disc valve opens to circulate coolant to tranny oil cooler.
The control unit is the probable cause. From under the car its a 2 min job to change. 2 vacuum hoses and electrical connector. From memory part less that £30
 
  
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isysman
Zolder


Joined: 22 Apr 2011
Posts: 5721
Location: Cheshire


PostPosted: Fri Sep 07, 2018 3:51 pm    Post subject: Reply with quote

I had this issue on a different car I opened. It was the thermostat. Car not moving everything looks normal, drive at speed for a while and it drops down to zero. I'll bet water thermostat.
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monster
Imola


Joined: 04 Sep 2010
Posts: 759
Location: Bournemouth


PostPosted: Fri Sep 07, 2018 6:09 pm    Post subject: Reply with quote

and if you haven yet got a low temp thermostat fitted, this is an ideal time to fit one as if even that doesn't cure your problem, you've helped to alleviate a potentially much bigger problem!
 
  
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Simmokj
Newbie


Joined: 08 May 2018
Posts: 38
Location: Cheshire


PostPosted: Wed Oct 17, 2018 2:58 am    Post subject: Reply with quote

Ok. So the issue has finally been resolved. A good few hours of expert investigation turned up a severed wire feeding the coolant temp sensor. Very happy not to have that blinking red annoyance in my face ever day
 



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