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)

996 turbo will not start


Recommended Posts

Hello !! I have a mystery I need help with. My car is a 2001 996 Turbo manual.

I drove my car for 30 minutes, parked it and went on an appointment. Returned an hour later and...it would not start and ended up with a tow truck recovery. Well, having followed all the good advise on reasons and cures for non starting - my car still wont start !! New fuel pump relay, new fuel pump, new battery and new fuses. There is over half a tank of fuel and plenty of battery power. Itturns over really well but it will not fire !! Any other thoughts or potential reasons that I may have overlooked ??

best wishes


Link to comment
Share on other sites

Have you scanned it for codes to make sure the ECU is still working?

Also check to see if the throttle body (TB) is operating, turn the key on and let it sit, go back by the engine bay and you should hear a whine and a few ticks as the throttle body runs through a cycle and does a reset, usually takes a minute for it to start after you turn the key on. If you dont hear this, the TB may be bad and could be fully closed not allowing enough air in for the car to start.

You did fuel pump, did you change the fuel filter?

Plus the clutch switch as mentioned already.

Link to comment
Share on other sites

  • 2 weeks later...

If you feel under the drivers seat do you feel any moisture? Sounds to me that it could be an immobilizer issue. If you have a way to check for fault codes with a tool that can read factory codes, you may have see an immobilizer fault in the DME. This would mean that it is not communicating with the Alarm module. Other possible immobilizer faults may be stored in the Alarm module. One quick check you can make with any scan tool is to see if you can connect to the engine module. You can do this even with an OBD2 tool. While the OBD2 tool will not tell you the immobilizer faults, nor will it read the alarm module. But if you can connect via these tools it will tell you that the K-Line connection between the alarm module and the DME is working. If you are unable to connect, then this would show that there could be a problem with the Alarm box. The communications used by all scan tools to the engine is routed from the OBD2 port first to the Alarm module then from the Alarm module to the DME. This same wire that is used for diagnostic tools is also used by immobilizer system to exchange codes prior to authorizing startup.

Link to comment
Share on other sites

Thanx for all the help and apologies for the delay in replying - mad time of year.

Problem sorted - it was the fuel pump but also a faulty new relay, so put "old" one back and it fired up. Car currently with PARR for extensive changes and will post after completion sometime in late January.

best wishes


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.