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alex yates
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15228
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu May 14, 2015 9:30 am    Post subject: Ticking over like a bag o' spanners - Fixed Reply with quote

Just recently my car's started ticking over bad, i.e. hovering around 600rpm and fluctuating. Also, when stopping and depressing the clutch revs drop really low, car nearly stalls and then gets a blip up to about 1500rpm then drops to being erratic and low again.

Points observed:

Car is eGas so no ICV.
Throttle body and MAF have been cleaned - no effect.
Car only does it after fully up to temperature (say after about 15 - 20 minutes driving).
Runs perfectly normal (around 800-900rpm) at tickover before fully warmed up.
Seems to be deteriorating as time is going on.


Any help appreciated.
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2000 Manual 996 C4 Arctic Silver Convertible




Last edited by alex yates on Fri Jan 18, 2019 4:00 pm; edited 1 time in total
 
  
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JohnnyDangerous
Estoril


Joined: 12 Jun 2013
Posts: 3613
Location: East Sussex


PostPosted: Thu May 14, 2015 9:44 am    Post subject: Reply with quote

Silly question but have you seen lugged into a dura metric? Also check for air leaks
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alex yates
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15228
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu May 14, 2015 9:46 am    Post subject: Reply with quote

Had a quick check for air leaks and not found anything (although not convinced there isn't any) and not plugged in for codes either.
Will do if I can't find something myself.

I was wondering if I've not got the plenum back on right when I did my started motor last month. Might take it off and redo it.


Edit: I'm starting to think either airleak or AOS on it's way out.
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JohnnyDangerous
Estoril


Joined: 12 Jun 2013
Posts: 3613
Location: East Sussex


PostPosted: Thu May 14, 2015 9:49 am    Post subject: Reply with quote

Easy way to find air leak is with eSy start! Spray sparingly near wher you suspect and see if revs change, have a fire extinguisher handy just in case
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alex yates
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15228
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu May 14, 2015 9:50 am    Post subject: Reply with quote

Laughing

Ok will do.
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Neil_Ireland
Newbie


Joined: 14 Jan 2015
Posts: 18



PostPosted: Thu May 14, 2015 12:58 pm    Post subject: Reply with quote

Mine had those symptoms and it was a faulty oil seperator.
It was faulty new from Porsche, mines a non egas car though.
 
  
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alex yates
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15228
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu May 14, 2015 1:39 pm    Post subject: Reply with quote

I'm guessing AOS as it does seem to be progressively worsening which suggests to me a worn part.
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rottenbend
Magny-Cours


Joined: 22 Aug 2010
Posts: 2588
Location: Hertfordshire

1997 Porsche 993 Carrera 2S

PostPosted: Thu May 14, 2015 2:15 pm    Post subject: Reply with quote

Isn't there a fairly easy test for AOS? Something to do with removing the oil filler cap while the engine is running?
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alex yates
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15228
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu May 14, 2015 2:24 pm    Post subject: Reply with quote

Yeah but that's only if it's proper goosed isn't it? Dont know

There's a vac on the oil filler but not so you can't easily take the cap off.

I know infrasilver mentioned on another post about testing it but didn't say how.
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wasz
Sepang


Joined: 28 Dec 2012
Posts: 2789


1999 Porsche 996 Carrera 2

PostPosted: Mon May 18, 2015 1:13 pm    Post subject: Reply with quote

I'd gamble on an air leak too. Pull the codes - might be "enrichment limit reached". As said spray some easy start around all the joints.

Check the AOS rubber bellows where it connects to the block. Can be hard to tell what vacuum is correct from the filler cap.

You can do this just by removing the passenger side rear wheel. feel around for a split. You can just about replace it too, but I had to use jubilee clips rather than the original spring clips.

Mine was split.

£6+VAT +del http://www.design911.co.uk/fu/prod6696/Oil-Seperator-Boot-Porsche-996-34L-1998-02---Boxster-986-99610723752/

EDIT: Guide here: http://911uk.com/viewtopic.php?t=61942
 
  
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alex yates
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15228
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Mon May 18, 2015 1:47 pm    Post subject: Reply with quote

Great stuff - leave it with me. I also think my coil packs are on their last legs as there's a few other tell tale signs they're on their way out

Can't check anything at the moment as I've just took my car in for a front bumper respray.
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Benji1975
Monza


Joined: 02 Aug 2014
Posts: 209



PostPosted: Mon May 18, 2015 8:58 pm    Post subject: Reply with quote

Hopefully nothing major Alex...surprised you don't have a code reader...they are an absolute god send. Even if they aren't always accurate, they give major clue's as to which area the problem might be in.
That said, my 20 quid one i bought way before the porker told me that my coil pack/plug on number 6 was duff...saved much faffage!

Ben
 
  
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alex yates
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15228
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Mon May 18, 2015 9:04 pm    Post subject: Reply with quote

I have got a code reader (cheap thing) but no codes have come up.
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 12692
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Mon May 18, 2015 9:35 pm    Post subject: Reply with quote

Lambda O2 sensor would be my guess Dont know Normally when cold there are no signs but once engine starts to get up to temperature it will kangaroo/judder/fart/oldmans knackers on a vibrating exercise plate etc what
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JohnnyDangerous
Estoril


Joined: 12 Jun 2013
Posts: 3613
Location: East Sussex


PostPosted: Mon May 18, 2015 9:47 pm    Post subject: Reply with quote

Air leak.................................still Cool
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pancobalt
Spa-Francorchamps


Joined: 02 May 2015
Posts: 282
Location: surrey


PostPosted: Tue May 19, 2015 5:37 pm    Post subject: Reply with quote

Excessive oil in my 997.1 inlet manifold was indicative of aos that let go.
 
  
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systemmeister
Spa-Francorchamps


Joined: 25 Jun 2014
Posts: 321
Location: Northants


PostPosted: Tue May 19, 2015 11:33 pm    Post subject: Reply with quote

Is it lumpy as a cement mixer?

I had similar symptoms but mine was vario cam solenoid.
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alex yates
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15228
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed May 20, 2015 7:39 am    Post subject: Reply with quote

No not that bad. Just when it's right up at temp, tickover is about 600rpm and fluctuating (bad enough to make the clutch thrust-bearing rattle slightly though).
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systemmeister
Spa-Francorchamps


Joined: 25 Jun 2014
Posts: 321
Location: Northants


PostPosted: Wed May 20, 2015 7:58 am    Post subject: Reply with quote

alex yates wrote:
No not that bad. Just when it's right up at temp, tickover is about 600rpm and fluctuating (bad enough to make the clutch thrust-bearing rattle slightly though).



Yup exactly same as mine by sound of it.
I will know if new solenoids have cured it shortly.

Putting aircon on raises the rpm and makes symptoms improve?
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alex yates
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15228
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed May 20, 2015 8:12 am    Post subject: Reply with quote

Yeah, but I'd have expected that anyway cos it raises it when it's running fine.
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