sept 2001 pano-help

[spooldup]

Anyone have this issue, its the only one missing from my years of pano.In the tech section their was something about a clicking noise on a 930 when you hit the gas pedal.Im pretty sure its in this issue because I lent it to a guy that had this problem with his 930 and he never sent it back to me and I have gone through my issues back to 1997 and now my 930 has this clicking problem but I cant remember what it was that caused the noise.Thanks for your help in advance.

[dheinz]

Pano quote;
The noise that you are hearingis caused by a common problem encountered on 1989 and earlier 911 Turbos with the bypass valve on the intake air assembly, which sits below the intercooler on the '78-79 cars and below the outlet pipe from the turbocharger on '75-77 cars, houses a bypass valve assembly whose function is mainly to relieve pressure from the turbocharger in between shifts or any time that the throttle is closed abruptly. There is a cylindrical bore with opening on two sides that when unobstructed allows air to flow from the outlet side of the turbo to the suction side of its inlet, and inside this bore there is a piston that is under spring tension to close it. A vacuum line from the intake manifold is connected to the rear end plate of this bore and serves as a way to pull the piston back into a retracted position, uncovering the bypass ports and allowing the air exiting the turbo to recycle itself back to the inlet anytime there is vacuum present (for instance at idle, deceleration or during a gear change).
At both ends of this bore there are large flat gaskets that act as cushions for the piston when it travels to either end of its stop. Over time, age, heat and oil eventually detetiorate these gaskets and they crumble apart leaving nothing behind to dampen the movement of the piston. So that clicking you hear is this bypass valve's piston functioning and every time it does, it is slamming against the end plates on the assembly instead of the gaskets that are supposed to be there. I have seen this often on these cars, and have also seen them actually have the end cover for the housing cracked open from the piston hitting it for so long like a battering ram, and the car has a huge vacuum leak as a result. The repair for this is to get the replacement gaskets and install them into the assembly.

Pano Sept 2001

[spooldup]

Thanks Eddie,I really appreciate you looking this up

[TimT]

I just threw out about 12 years of Panos!!

I do have Excellence nee Porsche magazine from the first issue if any of you are interested..