Results 1 to 7 of 7

Thread: Help diagnosing problem

  1. 06-02-2011, 10:11 AM #1
    PeterM1965
    PeterM1965 is offline
    Senior Member PeterM1965's Avatar
    Join Date
    Jan 2010
    Location
    Scarsdale, NY
    Posts
    326

    Help diagnosing problem

    Some background: 1968 Coupe, 2.2 S with Webers, Perma-tune box. Car was warm and performing well when it suddenly died. I pulled over and tried to restart it. It cranked, but wouldn't start. Strong gas smell so I assume the fuel pump is OK. Sat for a few minutes and tried again. Car started and ran for 10-15 seconds then died. I checked all fuses and connections and after about 5 minutes I tried again. It started and ran, but had a few misses then car ran normally getting me to my destination about 10 miles away.

    Any ideas where to start on tracking this down?

    Thanks
    Peter M
    Last edited by PeterM1965; 06-02-2011 at 10:31 AM.
    1968 Coupe
    901/10 with 2.2 Ps and Cs
    Webers
    911/01
    7s on all corners
    Now Sold
    Reply With Quote Reply With Quote
  2. 06-02-2011, 11:02 AM #2
    mjshira
    mjshira is offline
    Senior Member
    Join Date
    Jan 2011
    Location
    Hermosa Beach, CA
    Posts
    195
    it would seem to be on the spark side. are you confident the charging system is working? I am not an expert by any means but I would suggest you start with a careful review of the charging system. Make sure the battery is good, that the alternator is working properly, etc. After that, I'd check for consistent spark. I assume you have a single coil set up (single ignition).
    Reply With Quote Reply With Quote
  3. 06-02-2011, 11:06 AM #3
    PeterM1965
    PeterM1965 is offline
    Senior Member PeterM1965's Avatar
    Join Date
    Jan 2010
    Location
    Scarsdale, NY
    Posts
    326
    Yes, single ignition. Also the tach needle is very bouncy.
    1968 Coupe
    901/10 with 2.2 Ps and Cs
    Webers
    911/01
    7s on all corners
    Now Sold
    Reply With Quote Reply With Quote
  4. 06-02-2011, 11:14 AM #4
    mjshira
    mjshira is offline
    Senior Member
    Join Date
    Jan 2011
    Location
    Hermosa Beach, CA
    Posts
    195
    ok. so start with charging system. work your way to the coil and then distributor rotor. Again, I am not the guru on this board, many (most) are better. But start with charging system.
    Reply With Quote Reply With Quote
  5. 06-02-2011, 03:10 PM #5
    RSTarga
    RSTarga is offline
    member #1515
    Join Date
    Mar 2009
    Location
    San Antonio, Texas
    Posts
    4,261
    First I'd try cleaning the fuel filter at the bottom of the tank. Then I'd check ground on your ignition and make sure the points have not closed as your bouncing tach can indicate both of these problems.
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs
    Reply With Quote Reply With Quote
  6. 06-06-2011, 08:48 AM #6
    lwalwa
    lwalwa is offline
    Member
    Join Date
    Jan 2006
    Posts
    30
    Can you swap in a Bosch CDI? Permatunes are known to show initial signs of failure in that way - they reach operating temp and then stop working, you rest it a while and then they go for a bit more, repeat cycle.

    Larry

    '71E Targa
    Reply With Quote Reply With Quote
  7. 06-06-2011, 09:05 AM #7
    PeterM1965
    PeterM1965 is offline
    Senior Member PeterM1965's Avatar
    Join Date
    Jan 2010
    Location
    Scarsdale, NY
    Posts
    326
    A Bosch CDI is on my to do list.

    I was able to diagnose the problem as a loose distributor cap. The cap was wobbling around and had some impact damage from the rotor. Tightened up the clamps and the car us running normally, though I ordered a new cap and rotor and will replace.

    Thanks to all who offered advice.
    1968 Coupe
    901/10 with 2.2 Ps and Cs
    Webers
    911/01
    7s on all corners
    Now Sold
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Similar Threads

  1. Diagnosing the MFI RPM Transducer/Switch Help
    By Gearbox in forum Technical Info
    Replies: 13
    Last Post: 09-07-2020, 05:08 PM
  2. Here's my problem with the new 911.
    By MarkH in forum General Info
    Replies: 25
    Last Post: 07-16-2013, 04:09 PM
  3. Possible problem
    By frankmar in forum Technical Info
    Replies: 47
    Last Post: 02-20-2013, 01:00 AM
  4. problem
    By Matthijs356 in forum Technical Info
    Replies: 17
    Last Post: 02-29-2012, 09:19 AM
  5. PM problem
    By Cliff in forum General Info
    Replies: 2
    Last Post: 12-13-2010, 01:08 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules


Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.