exhaust valve on 430 no longer working?

They have 2 valves,sounds loud? are are they closed and not opening? simple to ck and test

 

They are vacuum operated. First thing to do is check the vacuum lines and see if there is a leak.

 

Just open the engine cover and you can see the valves on either side of the muffler. You'll also see the valve actuator, so you could easily test them from there.
John

 

It won't be a vacuum problem as no vacuum = open valves. It sounds like the valves are stuck shut, it is advisable not to drive at high revs with stuck closed valves as you will cause overheating of the exhaust system.
Unless of course the vacuum has failed, they are actually open all the time and you are just going deaf. LOL

 

my right side valve was stuck open due to debris in the hose. How road debris/junk got in there I will never know, I assume at one point a previous owner removed the line and it got in there then. It was a easy fix.

 

+1; do not drive HARD on a stock-closed exhaust valve. The system was not designed to operate in this mode. The most likely damage will be thermal.

 

You should be able to easily open and close the valve by hand with the engine off. If you need more access, you can remove the rear wheel and the plastic wheel arch cover. Remember, the valve is normally open and the vacuum closes it after you start the engine.

If it's stuck, I think the normal DIY approach would be, in this order: wiggle, then wiggle harder, then plenty of spray lube, more wiggling, then gentle tapping with a hammer, then perhaps a little heat, then more violent tapping, then stop and get yourself a beer while you weigh your further options. After a while, return for more spray lube and even more tapping, plus some cursing. Now you have to decide risking damage to the valve by using more aggressive techniques or taking it to a mechanic/dealership, or some other course of action.

Good luck.

 

I have a friend that has 130K on his 430 spider! Been a great car.

He has almost 25K on his 458 spider too!

 

Didn't know this. On my 355 the valve was always closed. Only under load would it open. And if there was a leak in the vacuum line...it wouldn't open.

 

Glad you got it fixed. Maybe one had been stuck for some time before then the other got stuck and then you noticed the sound change? Something I'll check once in awhile when in the engine compartment.

 

Would someone mind posting a picture of the location of this valve? Thanks!

Edit: Never mind. Found the pictures.

 

Remember to use an ultra high temp lubricant, probably grease. Most lubricants won't survive the exhaust temps, and your problem will resurface.