Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

Hi all,

As I lurk all the time, I thought I'd post what I have going on for the benefit of anyone that can use it.  Lately I've been having the dreaded intermittent cranks but won't start situation.  It seems to occur mostly when the engine is warm.  If left for an hour it starts up.  It happens twice in a day, or not for 3 weeks, totally random.  The car runs fine when its running.  It's only stalled once while running.  I was idling in the parking lot.  Just as I noticed rpms swinging between about 780 and 730ishm dead.  Started an hour later.


I tried a fully charged, brand new battery one time during the no start condition and it did not help

New fuel relay, no help.

A DME Relay is on the way.  I won't install it for a while to verify if it was the Crankshaft Position Sensor.

Today I changed out the Crankshaft Position Sensor.  The old one was covered in gunk and the magnetic tip was black.  The new one, nice and shiny magnet there.  So far so good, I'll update in a week or two.


The CPS is indeed a pretty easy job, anyone can do.  Just don't drop the screw in there anywhere!  I stuck some chewing gum in it, smushed it onto the allen socket and gently got it started.  Removing it, was the same.  Slow and gentle.  I used an allen socket and 1 long and one 6 inch extension put together.  Reaches in no problem.

I've attached a couple of pictures to help locate it.  Looking from the drivers side through the wheel well you can see it as shown by the red arrow picture.  Thats just the hole after its been removed.  I forgot to get a shot of it in there20160916_121856-1.jpg  The Yellow arrow picture shows its appearance if you were to slide under the car from behind, head first and just to the inside of the drivers side wheel well.  I've outlined the wire and labeled the CPS B (from the red picture)  and the plug end "A".  The plug has a little lever tab on top that you can't see,  Feel for it and push it down to disengage the plug.  You can totally get at it if you contort properly, no big deal.  That black plug to the left of it is something else and it made life easier to pull it out of its clip.  Pretty sure it just pulled straight out.


Anyway, for what its worth.  Fingers crossed its the CPS or the DME Relay next.  If not, I'm headed towards fuel pump I suppose....


-= Jazz


Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.