My K-66 TI Horror Story

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Tom C.
    Expired
    • November 1, 1997
    • 92

    #1

    My K-66 TI Horror Story

    I have decided to post this story because I have asked numerous questions related to this project on the discussion board and have been asked for the whole story by many responders to my questions. It is not intended to "bash" anyone's business or alledge dishonest dealings on anyone's part. It is simply the facts of what has happened so far in this restoration project. I also have hope that someone may be able to provide a helpful revelation which will solve the problem.

    I purchased a K-66 TI system from a regular advertiser in the Driveline, advertised as rebuilt and correct for my 1966 427/425 Coupe. It included the distributor, rebuilt amplifier, Delco embossed coil, and Lectric Limited TI wiring harness. The cost of the package was $1,000. Seemed like a good deal to me at the time. I am not a mechanic and would not know the difference in any case.

    Since I had a few weeks available before my mechanic could install the system I decided to send it to "the TI expert" (with whom everyone on this forum is familiar) for inspection. He informed me that what I received was not at all correct and the distributor and amplifier was in need of a major overhaul in which the correct parts would be installed and ready for my application. $1,250 (parts and labor) later the system was ready to go into the car. I had already been using the Lectric Limited braided stainless spark plug wiring harness and shielding with a points distributor, all of which worked very well.

    Once the TI was installed in the car, the car runs like a banshee until the engine warms up to 175 degrees plus. Then the car begins to missfire and dies completely when the clutch is depressed. The car has to cool down for a considerable period of time before it can be restarted. All electrical connections have been checked more than once. and yes, I purchased a second NOS coil to the tune of $150.00. I have heated the TI amplifier with a hair dryer and cannot duplicate the problem. The only thing left to do is to place the distributor in my home OVEN and heat it. If that turns out to have an effect, then the problem is most likely in the pickup coil inside the distributor, a $400 part (not including labor at $70/hr to replace). It is "the TI expert's" opinion that this is the problem. If so, why would not replacement of the pickup coil have been part of the (already expensive) overhaul? I have been advised that there is no way to test the distributor without installing it on a car and running it. I have also obtained other "expert" opinions which say that the car would not run at all with a bad pickup coil. In any case, I now have about $3,000 parts and labor in this so far fruitless project.

    I have still not reached rock bottom of all of this and don't know if I can afford to, but I thought this might make interesting reading for anyone contemplating restoration of a K-66 TI system. I think it would be important to know your parts well before purchasing them. I know of no vendors who will guarantee the operation of the distributor itself. If I should ever get the system fully operational, it will of course go into the relics case in my museum of original parts. I might consider using it to drive across the Barrett-Jackson auction concourse someday, but that's about it. PLEASE don't post the fact that yours has been working perfectly for the past 30 years, as the pain would be too much to bear.

    I would be happy to provide more specific details, parts installed, labor etc. if you will email me your questions. JUST FOOD FOR THOUGHT...
  • Duke W.
    Beyond Control Poster
    • January 1, 1993
    • 15229

    #2
    Re: My K-66 TI Horror Story

    Basic DC electrical skills are probably sufficient for you to find the problem along with the appropriate service manual, a multimeter, and a vacuum pump.

    Since it takes some time to restart after failing when hot, you should have plenty of time to find the fault.

    Operate the engine until the ignition system fails and then immediately check pickup coil resistance while using a vacuum pump to exercise the vacuum advance. These coils are rather delicate and an internal short or break in the lead wires (which are continuously flexed in response to the vacuum advance) can cause intermittent or themal related problems. The HEI pickup coils are essentially the same design, and I think they have the same resistance spec.

    Check ignition coil primary and secondary resistance.

    If the above two items check out okay, then the problem is either a connector or the amplifier.

    I've troubleshot/bench tested (out of the car) an entire TI system with a 12 volt battery and electric drill to spin the distributor. Unfortunately this test is only valid at room temperature. For the type of problem you are experiencing, testing immediately after the failure when everthing is at operating temperature is often the only way to isolate the problem.

    Duke

    Comment

    • John Pelkofer Jr

      #3
      Re: My K-66 TI Horror Story

      Hello Tom, I had the same problem last month with the same system. I found that I was loosing the 12 volt ignition supply to amplifier. Traced wiring to ignition switch and found switch very hot. After engine cooled a short period
      it would start again and continue until switch became hot. I felt that I may
      have a short causing the switch to get hot. I traced the wiring and found the
      pink ignition wire to the starter solenoid was shorting to starter housing.
      Repaired the wire and have had no problems since. John

      Comment

      • David M.
        Very Frequent User
        • October 1, 2004
        • 441

        #4
        Re: My K-66 TI Horror Story

        Hey guys, dont forget the one often overlooked and most important thing on a 12 VDC neg ground system, grounds, grounds, grounds, especially with a glass body car. Improper grounds will lead to all sorts of transient voltages, causing the voltage to seek other "not so good" ways to ground. Like through the TI amp or module. This is quite a common failure on all cars with electronic ignitions or ones that have been converted. This problem will present itself where it did not with the points distributor. Run a good #2 or #4 wire(s) from the block to the frame and clean the one under the motor mount if it has that cable like the C3s. Also clean the existing neg battery cable where it terminates on the frame.

        Comment

        • Richard S.
          Very Frequent User
          • November 1, 1994
          • 809

          #5
          Re: My K-66 TI Horror Story

          Just a thought...if it ran well with points type ignition system, but quits with the TI system, what ares might be more affected by the TI system?? Just looking for more specific areas Tom could check out. As Tom already knows, the trouble with my 67 435 TI system failure was also traced to a faulty ignition switch.
          Tom, with so much money in the system and if the system runs really well until hot...then I'd trace the problem no matter how long it takes or how much fun it turns out to be. Enjoy that 66 425 horse car...it's probably the fastest and most fun Corvette GM ever built. Good luck.....

          Rick.

          Comment

          • Tom C.
            Expired
            • November 1, 1997
            • 92

            #6
            Re: Thanks Guys

            I really appreciate the posts. I have never really checked my ignition wiring harness, and it would certainly be worthwhile to do that before tearing into the distributor again.

            And Rick, yes I will keep trying until I get to the bottom of the situation. Thanks for all of the support.

            Tom Cheairs

            Comment

            • Grant W.
              Very Frequent User
              • December 1, 1987
              • 405

              #7
              Re: Thanks Guys

              Wow!!! what great info in helping you try to solve your Ti problem. Tom let us know if you resolved your problem. I'm restoring a 68 with the Ti system too and when I get a chance to install it I want to do everything right. I hope to pass this info to any body in the West Coast if they are experiencing this problem with their car. In Salmon Arm B.C. the inaugural "Informational Meeting" B.C. NCRS chapter gets going....1st meeting this July 14. I can't wait. Anybody on the West Coast wants to join in or can't make it. You can have your name added to the list. Just email to Arne Chaddock chaddocks@telus.net so we will collectively vote our Chapter into existence. I think we have 25 or more prospective members showing up but adding some more prospective members to the list will help and it'll be the 1st NCRS Chapter in British Columbia. So wish us luck and I know Regionals are held in Bend Oregon but I hope we have the opportunity to start the chapter in B.C. and if it gets big enough so we can invite everyone to the Sunny Okanagan for a Regional meet. Grant

              Comment

              • Clem Z.
                Expired
                • January 1, 2006
                • 9427

                #8
                tie a 12 volt bulb into the TI 12 volt power line

                and if the bulb goes out when the engine quits you know you have lost 12 volt power. mount the bulb where it is visible from the drivers seat

                Comment

                • Richard S.
                  Very Frequent User
                  • November 1, 1994
                  • 809

                  #9
                  Re: tie a 12 volt bulb into the TI 12 volt power l

                  Now there is a good idea.....you da man, Clem.....
                  Love ya....
                  Waltzing Matilda....LOL....

                  Comment

                  • Clem Z.
                    Expired
                    • January 1, 2006
                    • 9427

                    #10
                    rick i thought our relationship was a secret.

                    we looked for matilda last time in FLA but she must have moved

                    Comment

                    • Tom C.
                      Expired
                      • November 1, 1997
                      • 92

                      #11
                      Re: Light Bulb Idea

                      I really like this idea. There are 2 leads coming out of the distributor to a connector. does anyone happen to know which one is the positive side? And the bulb would be just "tied" inline...+ in and + out??

                      Comment

                      • Clem Z.
                        Expired
                        • January 1, 2006
                        • 9427

                        #12
                        you can NOT use those wires, this test is only

                        to see if you are loosing the 12 volts going to power the TI system.you need to connect the bulb to where the wire,i think it is pink, from the ignition switch connects to the white resistor wire of the TI wiring harness.

                        Comment

                        • Clem Z.
                          Expired
                          • January 1, 2006
                          • 9427

                          #13
                          i have a copy of the GM trouble diagnosis guide

                          for the TI system and if anyone wants a copy email me.

                          Comment

                          Working...
                          Searching...Please wait.
                          An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

                          Please push the back button and reload the previous window.'
                          An unexpected error was returned: 'Your submission could not be processed because the token has expired.

                          Please push the back button and reload the previous window.'
                          An internal error has occurred and the module cannot be displayed.
                          There are no results that meet this criteria.
                          Search Result for "|||"