99 boxster does not start - vapor lock?

[gssereik]

My 1999 Boxster recently began having a problem... The car starts fine when cold. But once the engine warms up and then is turned off, it will not re-start. When trying to re-start, the lights all come on and the starter turns the engine over briskly. But it will not start. Like it is not getting a spark or is not getting fuel. But then if you let it sit for a couple of hours or more it will start right up. And it will always start the next day! It just recently began doing this. The first time I got a tow home. The second time, I drove it around to warm up and it ran just fine but then when i pulled into driveway and shut it down, it would not re-start. Lately I don't drive the Boxter very much. I do drive it at least once per week but usually only drive it around for 10-15 miles max. The Check Engine Light has not turned on. I have an OBD-II code reader that works on my other (non-porsche) cars but I don't know if it captures Porsche codes. At any rate, i did run the code search procedure but no codes were found. Not sure that I trust it though... Is it possible for a code to exist in the Boxsters computer but no Check Engine Light? I am not sure where to begin... thanks, George

[RFM]

Vapour lock phenomena are rather rare on M96 engines, i would look in to the relays or pump system. Check out if the fuel delivery (pressure, flow, residual pressure) on the rail is sufficient at the time the engine fails to run. Success.

[gssereik]

PROBLEM SOLVED! Based upon advice from many experts, I decided to purchase a new Crankshaft sensor. Access was a bit difficult but I got it in there and it fixed the hot start problem! And after shopping around online and finding prices north of $100 for the sensor, i checked with Advance Auto parts and they got the part for me for $70!! And although the packaging said some other brand, the actual part was the OEM BOSCH part with the bosh part number on it and everything. So I am a happy camper. Thank you for all your help and advice!