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noblebenn
Newbie


Joined: 10 Jul 2018
Posts: 17



PostPosted: Mon Apr 01, 2019 7:48 pm    Post subject: Variocam tapping noise Reply with quote

1999 996 3.4 Tiptronic.

I have an intermittent tapping noise at idle coming from the rear of the off side which appears to be from the Variocam. It disappears sometimes by itself but always with a few revs applied.

Any thoughts on what the tapping could be from the Variocam?

Hydraulic tappets all replaced on both banks so not these and definitely not bottom end.

Any thoughts appreciated.

Thanks.
 
  
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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1275
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Mon Apr 01, 2019 8:34 pm    Post subject: Reply with quote

What oil grade?
_________________
1992 944 S2 Cabriolet, Cobalt Blue/Classic grey -gone!
1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
1999 996 C2 Coupe, Ocean Blue/Graphite grey
2002 E46 M3 Cabriolet, Laguna seca blue/LSB
 
  
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noblebenn
Newbie


Joined: 10 Jul 2018
Posts: 17



PostPosted: Mon Apr 01, 2019 8:38 pm    Post subject: Reply with quote

5W 40. Just serviced.
 
  
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Jamesx19
Nürburgring


Joined: 10 Jul 2015
Posts: 467
Location: Brighton


PostPosted: Mon Apr 01, 2019 9:03 pm    Post subject: Reply with quote

I've had 3 different 3.4 996"s all have ticked on hot idle, all ran fine with no issues.

Posted before by someone else, but. The term "Tickover" was apparently coined by the engine speed that the ticking noise from a reciprocating engine ceases to tick at. Increasing the low idle speed on these engines tends to stop the ticking noise. Just a characteristic of these motors that sometimes happens. Think there is a member on here with a full rebuild which does it. If you don't have A/C on, try it and see if noise goes away or decreased

Could be piston slap but I'd hazard that this is unlikely unless it's a heavier knocking sound?

Ultimately I imagine you will get lots of answers and suggestions on here but you may decide to go to a good independent garage to give you a definitive.

Hope this helps
_________________
1998 C2 Manual + The Full Hartech.
 
  
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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1275
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Mon Apr 01, 2019 9:07 pm    Post subject: Reply with quote

Could be a few things, if it's tapping like the lifters, just because they have been replaced does not mean it's not them. Why were they replaced? If they failed but the cause was not addressed forinstance they were oil starved and the blocked oilways were not cleared then the problem will reoccur.
_________________
1992 944 S2 Cabriolet, Cobalt Blue/Classic grey -gone!
1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
1999 996 C2 Coupe, Ocean Blue/Graphite grey
2002 E46 M3 Cabriolet, Laguna seca blue/LSB
 
  
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