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The return of Marty Wild
Barcelona


Joined: 04 Nov 2016
Posts: 1451



PostPosted: Mon Apr 29, 2019 4:04 pm    Post subject: Reply with quote

I had this on my 987 after driving it for a year and a half with PSE on. To then go to a track day where they insisted it be off for noise levels. The excessive heat and operating it in a different position obviously shocked the components.

I had an interesting mix of issues. It was making hell of a din, turned out the actual rod that moves the butterfly valve had sheared on one side. So the valve was banging open and shut with the exhaust gas movements.

On the other side, it was stuck off as ball joint between the rod and the butterfly valve had seized.

With the help of a handy mate, we got them both fixed. He welded the rod on one side. We popped the ball joint off on the other and gave it a good clean up.

I now run the car with PSE off for the first 7 miles as I warm her up every drive now to keep the ranges up. I also get down there and give the moving parts I can reach a good WD40 every once and a while now too.

Rang a local indie, they only were interested in changing the whole silencer on the side with the broken rod. Think it was £1,200 for the part alone.

Rang OPC, was told my era of Cayman S wasn’t offered with PSE as an option (I s h ! t you not). I pretty much hung up the phone.

So in the end got it fixed for zero pounds and zero pence. Also gave the area a jolly good clean up too! Job satisfaction right there!
_________________
Life's too short for cr4ppy cars, keep it German!

Cayman S 987.1
 
  
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turbulence997
Newbie


Joined: 24 May 2013
Posts: 40



PostPosted: Mon Apr 29, 2019 7:37 pm    Post subject: Reply with quote

Thanks for the input, TBH I hate having things that don't work on my car even though my default selection is noisy with the PSE! I am guessing that with care, the back bumper and heat shields come off easy enough on the 997.1. Swapping out the dodgy valve should be ok if I can release the nuts, I guess a heat gun and a bit of WD will help avoid snapping bolts.

Before I go and take it apart, can anyone answer my question as to whether a leak in the vacuum piping downstream of the grey switch would cause a failure of both valves or just the one?

Cheers
 
  
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TonyC911
Spa-Francorchamps


Joined: 06 Jun 2016
Posts: 327
Location: High Wycombe, Bucks


PostPosted: Mon Apr 29, 2019 9:16 pm    Post subject: Reply with quote

turbulence997 wrote:
I managed to check the change over valve and it is working fine. I have checked both sides of the exhaust and have discovered that I have a failure of the actuator valve on the off-side silencer (gas from both pipes no matter what position of PSE switch). I fashioned a wire hook and managed to operate the valve and there was no sign whatsoever of it being seized. I wasn't brave enough to stick my head down there and try it with the motor running, so only verified as unseized with engine off.

Can anyone tell me whether a leak in the vacuum pipework could result in a single actuator failure?

The nearside valve actuates correctly with switch movement. My wild guess is that a leak anywhere in the vacuum pipework downstream of the grey valve would result in a failure of both actuators? The off-side braided hose is securely attached to the actuator. With my limited knowledge of fault finding on this system, I am leaning towards an actual failure of the actuator as opposed to the vacuum components. Just because the actuator is not seized does not necessarily mean that it is not faulty. Would that be correct?


Hi Jamie,

You are going to find this very difficult to diagnose without removing the bumper and heat shield. And to make a repair they will have to come off anyway. Initially I found it useful to place my phone under the car and record a video whilst operating the switch, I did this on both sides to compare any movements.

It does sound like the diaphragm of the actuator valve has failed, but there are a couple of other moving parts which could also possibly of failed. I believe the valve is a pretty cheap part <£20. If you do not have the capability to store the car inside for a period, then it might be worth ordering a replacement vacuum pipe and fixing clip also.

I tend to agree with you, I would expect the vacuum to be a closed loop system and therefore a leak would cause both sides to fail, but I cannot be 100% sure. I hope that helps!
_________________
2007 Carrerra S
2005 Boxster S
2003 Boxster 2.7
1998 Boxster 2.5
 
  
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TonyC911
Spa-Francorchamps


Joined: 06 Jun 2016
Posts: 327
Location: High Wycombe, Bucks


PostPosted: Mon Apr 29, 2019 10:26 pm    Post subject: Reply with quote

I thought this might be a helpful picture, it shows the actuator valve in the open position (PSE on).
_________________
2007 Carrerra S
2005 Boxster S
2003 Boxster 2.7
1998 Boxster 2.5
 



PSE HAT 25ioo43.jpg
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PSE HAT 25ioo43.jpg


  
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turbulence997
Newbie


Joined: 24 May 2013
Posts: 40



PostPosted: Tue Apr 30, 2019 7:22 am    Post subject: Reply with quote

Cheers Tony.

Yes she's garaged (am I allowed to say that anymore? ) Surprised. I will have a go at removing the rear bumper trim today. My plan of action is to release both actuators and swap the serviceable one over to the other side and test the system. Thanks for all the useful replies guys.

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