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HarshSwine
Newbie


Joined: 30 Nov 2008
Posts: 2



PostPosted: Wed Jan 07, 2009 10:15 am    Post subject: Weird fault under acceleration Reply with quote

Hi All,

I am wondering if anyone else has experienced a similar issue with their 997 as I have on my 987 Boxster (Im assuming the affected parts will be generic to both).

Under light or heavy acceleration or even when cruising all of a sudden the revs suddenly start dying away as if I had suddenly taken my foot off the accelerator. If I push the accelerator to the floor the revs do not increase. If I take my foot completely off the accelerator and then re-apply the accelerator again the car will pick up revs as if nothing ever happened.

My thinking is that it must be an intermittent fault with the accelerator and its associated electrics/software/hardware. The car doesnt have cruise control incase you suspect it might be an infringement from the associated kit. There are no mechanical knocks or noises and no warning lights come on.

Has anyone else experienced this? What would you suspect is at fault?

The regularity of the issue has increased of late to the point where the car is undriveable as far as im concerned, but my OPC are seem reluctant to replace anything as their diagnostics come back as fine (although they have experienced the fault when testing). The issue has appeared on several occasions when pulling away at junctions causing me a few brown trouser moments and I dread to think what might happen if it kicks in whilst overtaking on an A/B road!

Any thoughts/advice will be greatly appreciated by this gutted owner.
 
  
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apw2007
Zolder


Joined: 29 Apr 2008
Posts: 5798
Location: Surrey


PostPosted: Wed Jan 07, 2009 12:26 pm    Post subject: Reply with quote

The throttle on the 997 is controlled electonically (no cable) so suspect the fault is going to be with one of the following: throttle potentiometer, throttle pedal or throttle butterfly (or possibly the DME but would seem unlikely in this case). Sorry but can't help on how you would isolate which one is causing the fault but if you unhappy with your local OPC then it might be worth giving Porsche GP (Reading) a call - you right about not wanting to drive the car
 
  
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HarshSwine
Newbie


Joined: 30 Nov 2008
Posts: 2



PostPosted: Wed Jan 07, 2009 9:40 pm    Post subject: Reply with quote

To add insult to injury my latest courtesy car turned up. A Chrysler Sebring Diesel Sad
 
  
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Pete Hadfield
Suzuka


Joined: 06 Sep 2008
Posts: 1147
Location: 25 miles north of Manchester

2007 Porsche 997 Carrera 2S

PostPosted: Wed Jan 07, 2009 10:24 pm    Post subject: Reply with quote

Could it be a fuel line blocking maybe even a filter? Did they think that was a possibility.

In the old days I would be checking the rotor arms on the distributor cap as I've had this loss of power before so could it be an electronic ignition problem that is intermittant?

Pete
_________________
Pete,

997 C2S, no longer a 'Ring virgin
 
  
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sportsandclassic
Approved Trader


Joined: 21 Apr 2008
Posts: 275
Location: Nether Alderley Cheshire


PostPosted: Sat Jan 10, 2009 3:47 pm    Post subject: Reply with quote

Hi

If it was a pedal problem it should in theory not rev up as it would see a problem and put in emergency running mode with a warning lamp on dash...engine check light.

It needs plugging into a piwis machine and diagnosing by an opc or a good indy that is familiar with modern 911/boxster cars.

It maybe an airmass sensor playing up or something stuck close by it restricing the air flow over the hot film part ( had this before).

Mike
 
  
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