Today when driving the pse sounded good then all of sudden it got quieter and has been since totally night and day. When hitting the PSE you can tell the ton changes but not the same as before. Any idea? Thanks

 

Have you checked the vacuum lines in the engine bay??
I'd also check for voltage at the vacuum valve plug when switching on and off.
Could also be siezed vacuum valves on the silencers.

If the tone is still changing, then the valve will prob be ok. Vacuum connections next as they are easier to get to.

 

you wouldnt happen to have a picture of their location and how to test?

 

The valve is on the right of the engine with a brown plug on the top.
The main vacuum line runs from the valve to the main brake servo vacuum line on the left side of the engine. it will be connected using a rubber Y connector if it's gen PSE. Mine is a bit different as it's a self install.
The Y connector on the valve has the lines that run down to the silencers.
To check the wiring, remove the plug and connect the live and earth to the correct sides of a multimeter. Then have someone activate the switch to see if you are getting +12v switched to 0V
You'll just have to visually inspect the lines for splits or cracks.
If you want to check the silencer valves, I'm sure they can be accessed from under the rear bumper. When the car is cold, check that there is full movement by moving the connecting rod in and out.

Pics to follow.................

 

Hope the pics help.

 

Another one

 

Ok the hoses appear to be on the ones connected to the plug. How else should I test the vacuum lines? Any help would be great. This all happened when I was driving with the pse on then got quiet

 

Temporarily disconnect the orange plug going to the the vacuum solenoid. That should cause the PSE (both mufflers) to go to the 'loud' state. If it doesn't I'd suggest checking the vacuum lines at both the source of vacuum and the connection to each of the PSE mufflers. If both mufflers don't go loud I would suspect the solenoid actuator (gray device) or the vacuum lines going to it.

Its highly unlikely that both muffer's vacuum driven valves would fail at the same time.

ps. Is your PSE driven off the DME or is it a post factory install (toggle switch enabled).

 

well my engine bay is different then yours as for the hook ups. I think the vacuum lines are on the right. Today I fired it up and did a test with the pse on and off and the tone on both side are the same when on and off. I haven't driven it yet so I will see. Is it possible that something is happening when im driving to kill the tone I had before or make it less than it was before now?

 

Well been driving it and sounds good. Then last night drove it sounded great then hit the gas in a tunnel then I lost the full sound I had before. Can something happen when driving then reset when the car cools down?

 

Hi,

I've realized that my Sports Exhaust button doesn't really make a difference when pressed even with Sports and PASM plus button also on (toggling all three buttons..Sports, Shock, and Exhaust buttons turned on/off) and there is no difference in sound at idle. I noticed that there is exhaust air flow coming out of the outer exhaust pipes (just not as strongly as the inner pipes) when idle. I haven't had the chance to have someone step on the gas while parked while i watched the exhaust pipes to see if they flow equally strongly under throttle (although I'd have to check this visually, i might use my cell phone in video mode to check this today). Not sure if this is a definitive check to see if they are opened or closed. Is there a way for me to manually toggle them opened/closed in case they are stuck and need a nudge? (if so,..please provide a detailed description of how and if possible include pictures as although I am not afraid to get my hands dirty, I'm certainly not gifted mechanically).

I've disconnected the power cable (in engine bay) to the sports exhaust vacuum solenoid which should allow the valves to remain open ..but I notice no difference with the cable connected with PSE on and cable disconnected. Unfortunately, this could mean, the valves are always stuck opened or closed (of course I'd prefer they were stuck open) but not knowing the difference in sound, I have no idea which scenario I'm in.

I would appreciate help from anyone before I start throwing $$ at it.

Thank You Sincerely!

 

Update.. I was able to locate the valve under the bumper (passenger side) and manually pressed in and could feel that it would spring back. It was not stuck. Now, I assume that default is opened..so when I pressed in, it would be closing that exhaust path (causing it to be quiet). Since it could be easily pressed in and always smoothly sprung back as I released it, I believe the mechanical valve/flap is not jammed). I could not find the driver side valve . Keep in mind, I have no lift, it's wet outside and I'm out of town and so don't have the convenience of my dry/warm/brightly lit garage. I suppose the next check I can make is to check to see the physical position of this valve with sports exhaust turned on (all three buttons on lit "sport,shocks,exhaust") while still cold in idle (engine on). This way I can get a better feeling if the exhaust is always open or closed.

 

I'm wondering if anyone can help out.

My 997.1 came with PSE, but the wiring of this car was pretty screwed when I got it and I'm almost done getting it right. I need to know where the two wires that goes into the right side solenoid switch that controls the exhaust goes, the wires that connect to that brown connector, I cannot find it anywhere in the engine bay, I just need to know where it comes from in the rear harness.

 

Did either of you get to the bottom of your PSE issues by chance?

 

Yes, as I recall, I took it to a Porsche dealer where it was repaired under my CPO. It took them about 3 weeks since it was during Christmas holiday's. When they were finally done, the mechanic said he had to remove the engine and replace 4 to 5 vacuum actuators or something of that sorts.
I owned the car for several years after that and never had another problem with PSE button.