99 Boxster hot start problems - Vapor lock symptoms - 986 Forum - The Community for Porsche Boxster & Cayman Owners

root_werks · 03-10-2010, 08:01 AM

I've heard the crank sensor is one of those "Replace every xxx miles" sort of part. Kinda like the MAF, often times they won't just fail, but have degrees of failure kind of working most of the time just causing all sorts of issues.

Good job on the fix!

masterbm · 07-25-2010, 07:16 AM

Hey,

I've got the same deal in my '99 with 140K. Think I'll try the sensor fix. Got a part #?

B

masterbm · 08-03-2010, 01:31 PM

Well, turns out it was INDEED the crank position sensor. Fixed, and now car runs great. No thanks to the shop that said it was the ignition.

B

craigf103 · 08-15-2010, 07:21 PM

Where is the crankshaft sensor located on the engine? I want to replace mine but don't have a manual to find where it is located.

Pianohawk · 09-29-2010, 12:51 PM

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 · 10-10-2010, 08:36 PM

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 · 06-19-2012, 02:19 PM

Quote:

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?