986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Is this what a bad Crankshaft Position Sensor looks like at the tachometer?

jakeru · 05-17-2019, 09:10 AM

My 2001 Boxster base 2.7 has been acting up intermittently over the last few weeks with increasing frequency. Yesterday, I drove it then parked it, had dinner, and coming back to start it, it wouldn’t start in the parking lot.

I tried substituting the fuel pump relay with a bypass wire, and that didn’t make any difference.

https://youtu.be/cXlf-JOnPZU

I captured this video showing the tachometer when I’m trying to start it. The tachometer rises to “0” when I turn the key to the accessory position, but it doesn’t move away from “0” when cranking. Does this mean it’s a bad crankshaft position sensor?

What’s involved in replacing the CPS? Is there a link to a “DIY How-to?”

Also, is it necessary for me to buy a scan tool to download ecu codes to further diagnose this problem? Or have I gathered enough info to diagnose it?

Thanks!

05-17-2019, 09:10 AM	#1
jakeru Registered User Join Date: May 2015 Location: Greater Seattle, WA Posts: 534	Is this what a bad Crankshaft Position Sensor looks like at the tachometer? My 2001 Boxster base 2.7 has been acting up intermittently over the last few weeks with increasing frequency. Yesterday, I drove it then parked it, had dinner, and coming back to start it, it wouldn’t start in the parking lot. I tried substituting the fuel pump relay with a bypass wire, and that didn’t make any difference. https://youtu.be/cXlf-JOnPZU I captured this video showing the tachometer when I’m trying to start it. The tachometer rises to “0” when I turn the key to the accessory position, but it doesn’t move away from “0” when cranking. Does this mean it’s a bad crankshaft position sensor? What’s involved in replacing the CPS? Is there a link to a “DIY How-to?” Also, is it necessary for me to buy a scan tool to download ecu codes to further diagnose this problem? Or have I gathered enough info to diagnose it? Thanks! __________________ 2001 Boxster Last edited by jakeru; 05-17-2019 at 09:19 AM.