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911_AS
Imola


Joined: 22 Apr 2013
Posts: 805
Location: London

2012 Porsche 991 Carrera S

PostPosted: Thu Mar 15, 2018 1:44 pm    Post subject: Low Revs, PSM loss, Cuts Out Reply with quote

I had a strange issue on my 991 this morning.

I was on my way to an OPC, and noticed the revs were a little low on idle. Even when warmed up, the car didn't maintain high revs, I had to switch over to manual to stop the PDK from changing up so I could keep the gear low.

Randomly, I then get an error message on the dash:

"PSM loss - possible to drive on carefully"
and then "Start/Stop operation Deactivated".

The car then splutters and cuts out completely, whilst I was sat at a set of red lights! Thankfully, I was right outside the OPC and managed to get it going enough to reach the car park.

Not sure if it was luck that this error occurred today of all days as I was going to OPC. My suspicion is it's battery related, but I can't be sure until OPC run their diags.
_________________
991.1 C2S. 2012. Basalt Black. PDK.
997.2 C2S. 2010. Meteor Grey. PDK. SOLD.
997.1 C2S. 2006. Basalt Black. Manual. SOLD.

Naturally Aspiring.

 



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deMort
Reims


Joined: 21 Mar 2015
Posts: 4270
Location: Brighton


PostPosted: Thu Mar 15, 2018 7:24 pm    Post subject: Reply with quote

This is one of those .. " how long is a piece of string answers " .

There are many things i can think of from high pressure fuel pump to throttle body potentiometer failure , let alone all the possible electrical faults .

Dam good luck to happen on the way to the OPC though .

Fault codes are pretty good on 991 so they will have a good idea after a code read out .
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Mechanic

7pm - 9pm
At an Indy these days !
 
  
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Tobyone
Silverstone


Joined: 20 Jan 2018
Posts: 131
Location: Somewhere else


PostPosted: Thu Mar 15, 2018 7:28 pm    Post subject: Reply with quote

Started my 997.1 up last month after 3 months or.

The engineer was not firing on all cylinders and the car was shaking like mad, the warning light came on and said something like 'goto your nearest dealer'

Turned the ignition off then started it up again and was fine.

No idea what was going on but worried the hell out of me. Confused
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997.1 C4s GT Silver, factory Aerokit
 
  
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deMort
Reims


Joined: 21 Mar 2015
Posts: 4270
Location: Brighton


PostPosted: Thu Mar 15, 2018 7:59 pm    Post subject: Reply with quote

Best guess there is the fuel pressure took a while to build up ..

Again a fault code check would say if theres any under lying problems that have only shown them selves by the long layover .

Drive it and see how it goes .. i expect it will be fine .
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Tobyone
Silverstone


Joined: 20 Jan 2018
Posts: 131
Location: Somewhere else


PostPosted: Thu Mar 15, 2018 9:38 pm    Post subject: Reply with quote

Demort wrote:
Best guess there is the fuel pressure took a while to build up ..

Again a fault code check would say if theres any under lying problems that have only shown them selves by the long layover .

Drive it and see how it goes .. i expect it will be fine .


Thanks, something I would never of thought of.

Driven not twice since and it has been totally fine.

Thanks fella
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997.1 C4s GT Silver, factory Aerokit
 
  
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911_AS
Imola


Joined: 22 Apr 2013
Posts: 805
Location: London

2012 Porsche 991 Carrera S

PostPosted: Fri Mar 16, 2018 10:29 am    Post subject: Reply with quote

Demort wrote:
This is one of those .. " how long is a piece of string answers " .

There are many things i can think of from high pressure fuel pump to throttle body potentiometer failure , let alone all the possible electrical faults .

Dam good luck to happen on the way to the OPC though .

Fault codes are pretty good on 991 so they will have a good idea after a code read out .


Thanks Demort. Awaiting a call from OPC today to find out the root cause and fix. Watch this space.
_________________
991.1 C2S. 2012. Basalt Black. PDK.
997.2 C2S. 2010. Meteor Grey. PDK. SOLD.
997.1 C2S. 2006. Basalt Black. Manual. SOLD.

Naturally Aspiring.

 
  
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911_AS
Imola


Joined: 22 Apr 2013
Posts: 805
Location: London

2012 Porsche 991 Carrera S

PostPosted: Thu Mar 29, 2018 8:59 am    Post subject: Reply with quote

This is now resolved.

Issue was misfiring cylinders - Vavle lift control. A new Valve Lift solenoid in bank one was needed (the one that sits between the ignition soils).

All work was done under warranty and the car now drives as expected.
_________________
991.1 C2S. 2012. Basalt Black. PDK.
997.2 C2S. 2010. Meteor Grey. PDK. SOLD.
997.1 C2S. 2006. Basalt Black. Manual. SOLD.

Naturally Aspiring.

 
  
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deMort
Reims


Joined: 21 Mar 2015
Posts: 4270
Location: Brighton


PostPosted: Thu Mar 29, 2018 6:16 pm    Post subject: Reply with quote

Thats interesting .. well more so for me !

Ive done a couple of these solinoids so far and no customer has complained of a PSM fault before ..

One for me to add to my list of customer descriptions and possible faults Thumb


Oh and glad its fixed young man Very Happy
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