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Joined: 24 Mar 2019
Posts: 14
Location: Newcastle upon Tyne

PostPosted: Thu Aug 22, 2019 9:51 pm    Post subject: Intermittent Loss of Power Reply with quote

My 2005 997 runs like a dream but over the past few weeks I’ve experience loss of power momentarily. I’ve read other posts about a similar experience when pulling away or with a cold engine. My experience can happen on a warm engine when driving. As an example, I’m driving along at say 40 then gently accelerate but nothing happens. I lift my foot then repress the accelerator and it works fine. On a recent 100miler this happened about 5 times. Only a minor inconvenience at the moment but clearly not right and worried it could be the symptoms of something more serious.
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Billy Bumpsteer

Joined: 12 Aug 2019
Posts: 225

PostPosted: Fri Aug 23, 2019 7:41 am    Post subject: Reply with quote

Maybe they can help in the 997 forum?
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Joined: 29 Jun 2010
Posts: 16214
Location: Kent

PostPosted: Fri Aug 23, 2019 8:02 am    Post subject: Reply with quote

Billy Bumpsteer wrote:
Maybe they can help in the 997 forum?

Thumb Moved from the 964 sub-forum.
2007 Guards Red 997 Turbo Tiptronic
ex 2004 Polar Silver 996T Tiptronic
ex 2002 Seal Grey 996.2 C4 Tiptronic
ex 1978 Silver 924 Manual
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Joined: 21 Mar 2015
Posts: 7721
Location: Brighton

PostPosted: Fri Aug 23, 2019 6:47 pm    Post subject: Reply with quote

I'm afraid there's very little you can do without a tester and looking at possible fault codes and actual values for the throttle potentiometers .

One thing to try .. especially if you have recently had a flat battery ..

Turn the ignition on but don't start the car or touch the throttle pedal for 30 seconds .. at which point turn the ignition off , lock the car then drive it and see .

Thats an adaption but it can also be done and indeed checked if it knows these settings via a tester .

Clean out the throttle body is another but it would have to be pretty damn dirty to cause this i feel .
My Daughter's Crowdfunding has hit the target .

Thank you all so Very much .

She's not going until july 2020 though .


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Indy Mechanic .
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Joined: 15 Jun 2010
Posts: 207
Location: South Wales

PostPosted: Sat Aug 24, 2019 9:52 pm    Post subject: Reply Reply with quote

Have this on mine, happens occasionally, couple of hundred miles between occurrences, almost always when pulling out of a junction within 5 minutes of starting. Haven’t solved it yet, Indy is suggesting a new software map as a start.
I have read forums which suggest many things, including wheel sensors causing the PASM to cut the throttle momentarily, throttle sensor, etc, I’m not sure there is an easy fix but keep us posted.

Mine has had a flat battery over the winter so I will try deMort’s suggestion.
997 CSR, Atlas Grey.
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Joined: 09 Aug 2014
Posts: 245
Location: London

PostPosted: Sun Aug 25, 2019 5:53 am    Post subject: Reply with quote

Sometimes it's the easiest and cheapest option that can remedy this problem. I had intermittently too, until I changed my air filter during a major service. I believe the most common reason is due to cracked coil packs.
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