99 Boxster hot start problems - Vapor lock symptoms

[Pianohawk]

My 99 Boxster also has a hard start up issue. Every mechanic I ask about the CPS tells me that's prob not the cause, it's very frustrating. Please post some quick info on how to replace one. Thank you!

[craigf103]

I replaced my crankshaft position sensor to try and fix my hot start problem and unfortunately it didn't help. It is relatively easy to do once you take the right rear wheel off. A few weeks later I got a CEL and took it in to my local INDE Porshce shop. The read the codes and initially told me the MAF sensor was bad which I was kind of skeptical about since the MAF seems to be often misdiagnosed as the problem. They replaced the MAF sensor and found it didn't solve the problem so actually started doing some more detailed diagnosis and found the fuel level sending unit and fuel pump and that did clear the CEL and solve my hot start problem finally! They took the new MAF sensor back out so I didn't get charged for that.

[denvergold]

Originally Posted by craigf103

I replaced my crankshaft position sensor to try and fix my hot start problem and unfortunately it didn't help. It is relatively easy to do once you take the right rear wheel off. A few weeks later I got a CEL and took it in to my local INDE Porshce shop. The read the codes and initially told me the MAF sensor was bad which I was kind of skeptical about since the MAF seems to be often misdiagnosed as the problem. They replaced the MAF sensor and found it didn't solve the problem so actually started doing some more detailed diagnosis and found the fuel level sending unit and fuel pump and that did clear the CEL and solve my hot start problem finally! They took the new MAF sensor back out so I didn't get charged for that.

So you replaced the fuel level sending unit and fuel pump?