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I am having the same problem. I have followed the write-ups as far as the valves. All things seem to be working correctly up to that point. No leaks or unconnected wires, air pump working properly etc. Rather than rip apart the engine parts necessary to diagnose the problem, put it back together, wait for the parts and then rip it all back apart to install the parts I choose to order both the electrical and air valves( under ($100) and just put them in. The local Porsche mechanic told me that no warm will come to the engine or cats if I ran it till I got the parts. My way might not be the correct way but being a landscaper I have only a few hours off and I chose not to waste them. I can make more money in the time that it takes to pull thr valves and check them than the cost of two sets of valves. Good Luck, Ed
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