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CDI unit issues on 1979 930

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    CDI unit issues on 1979 930

    On the run to and from Hangar Banger 2 on Sunday I had intermittent electrical problems that necessitated a tow truck journey the last 50 kms.
    I believe the issue was caused by either my 1997 dated Laser Line immobiliser which I have now turned off using the control box on/off key.
    Otherwise it is more than likely as I experienced 8 or more total power cuts to the engine that it is a faulty CDI unit. 7 out of the 8 times it cut out I could restart by turning the ignition key to the off position before pressing the immobiliser key pad, each time the car restarted immediately and traveled up to another 70 kms before cutting out again, Other times maybe 5 kms only. Once cool and taken off the tow truck the car started and idled fine but I have been loathe to drive it on the road.
    For the record the car had major engine work undertaken by RSR about 10,000 kms ago so all the leads and components are in excellent condition.
    The CDI unit fitted to my August 1978 build 930 is 0 227 200 004 which is the identical number to the unit fitted to my 1979 911 SC.
    Can anyone confirm that both cars which were Australian delivered would share the identical 6 pin unit.
    I need to isolate the intermittent problem so wondering if anyone has one that they are happy to sell, know of a supplier or anyone that can rebuild or test one.
    The plan is that if CDI part number 0 227 200 004 s common to both my cars I will try the one of the SC on the 930.
    Thanks in advance Neville

    #2
    Nev if you go into the PDF katalog for the 78-83 911s (avbl on the Porsche Classic website) you'll be able to confirm that they're the same. I took a quick look and there is no delineation between turbo and SC CDIs.
    BUT..... I'd recommend confirming this yourself or with your local Porsche parts guys.

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      #3
      Check with Chris (9er). I think he had a cdi for sale recently.
      Paul M

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        #4
        Thx Paul
        Yes first port of call was Chris re the issue. His CDI units are 3 pin whereas mine are 6 pin. Putting it out there to try to find out if anyone can test a CDI for an intermittent or low voltage output and who rebuilds them as well as where to source one if needed. Also want to make sure that they are interchange between the Turbo and the SC. Going to pull the one off the Turbo and bolt it on the SC to test. If it is ok then hopefully it was the immobiliser which I have turned off for now.
        Nev

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          #5
          I'd remove the immobiliser completely, that would take that out of the equation.
          I had one on one of my cars that would randomly sound the alarm while taking a left hand turn. I opened up the smugglers box one day an found where they had installed the unit. One of the main power wires had been rubbing into the steering shaft and worn through the insullation coating shorting out and setting the alarm siren off.
          Aus del 68 911S

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            #6
            Check the coil as well - it sounds more like that - I had a near new coil fail a few years ago.

            When CDI's go - they don't tend to go gradually like that. They work perfectly up the second that they fail.

            JR
            Justin Reed
            aka Reedminor
            1968 911L #11810329 (SOLD)
            1977 911 Carrera 3.0 #911760765
            1961 356B #114700
            Instagram: reedminor

            Comment


              #7
              First step might be to follow Justin's advice and switch coils or get a sparky to check both. New and upgraded CDIs are available overseas that keep the genuine appearance or you could go MSD.

              Comment


                #8
                Thanks to all those that have contributed. I was talking to a specialist electrician at HB2 at the weekend who had a visual look at the components, coil, fuses and ignition switch and who I believe is looking at rebuilding CDI units. Before I call him in I am hoping to isolate the issue as best I can. I will take on the recommendations and using my SC as the test car will swap some components like coil, CDI etc in the hope that it is an easy diagnosis. Once that is done I will look at taking the Turbo out to see if the Immobiliser is causing the intermittent problem and if so I will have it removed. P.S Have checked the green wire on the coil which is not aged or heat effected.

                Comment


                  #9
                  Nev, an SC coil just popped up on the PCV site (Parts). Bosch coil but used and no price. You might be able to source a new one from Bosch if necessary. Mercedes parts are often the same as porsche used , plug leads for instance.
                  Cheers
                  Paul M

                  Comment


                    #10
                    Originally posted by reedminor View Post
                    Check the coil as well - it sounds more like that - I had a near new coil fail a few years ago.

                    When CDI's go - they don't tend to go gradually like that. They work perfectly up the second that they fail.

                    JR
                    think i'm with Justin about the coil, i had very similar symptoms before mine failed.

                    clyde had one for sale https://www.typ901.org/forum/forum/c...il-and-bracket

                    if you end up replacing the CDI the twin spark units from Johnny at Classic Retrofit are outstanding

                    regards
                    Craig
                    12/1969 E based Vintage Racer
                    1972 2.4E Targa project
                    1973 911 2.4E for the road

                    Comment


                      #11
                      Interesting feedback thanks.
                      I have spoken to the electrician again and trying to self diagnose the problem before I call him out. He doubts that it will be the coil from his experience they are seldom the cause and he looked at the car on Sunday but minus any tools of the trade. He is in the process of having a 6 pin CDI unit rebuilt and will have it available to do onsite exchanges so depending on price it may be a cheaper option if that is the final diagnosis.
                      I have just pulled all the boot contents out including the mats and located a Peel CP30 gas cut out device device behind the main fusebox. So not only do I have the Laser Line immobiliser box in the passenger side , but there is also a LPG gas cut out unit with 4 connectors: Ground, Coil Negative, Gas lock off and Gas 12V.
                      So the obvious place to look is at the Anti Theft/ Immobilizer system and the 2 seperate cut off systems which have been installed.

                      Comment


                        #12
                        Remove the rest of the LP Gas system Nev and your problems may be solved
                        Clyde Boyer
                        TYP 901 Register Inc.
                        President
                        Early S Register Member #294

                        Comment


                          #13
                          Can't afford to run it on petrol though!

                          Comment


                            #14
                            Neville, it's most likely your CDI box. I have a 1985 930 that exhibited identical symptoms. What made it worse, is the unit had already been rebuilt (By PartsKlassik) the year before and it failed again.

                            I ended up buying this:



                            The lifetime warranty appealed along with the ability to lock the mechanical advance and have the advance curve timed electronically. I bought the "pro" version that allows curve programming on the fly.

                            I toyed with the idea of buying a new Bosch unit however I could not ascertain how long they'd been lying on the shelf. I wanted a "new" unit. And there was no way I'd fit a used one, they're just a time bomb.

                            Assuming you have a 6 pin box, it is identical to the equivalent 911 SC unit.

                            CJ

                            Comment


                              #15
                              Thx Carl
                              I ended up taking the car to SV Auto Electical, a well known and highly recommended Porsche trained electrical specialist in Ringwood Vic. He removed the old immobilizer and alarm system, restored the wiring circuit at the front fuse box, pin out fuel pump circuit as required, located a corroded rear fuel pump control relay and supplied and fitted a new pressure sensor. So far no more problems however this car gets little use and has not driven more than 4o kms on any one drive. I hate seeing it on the back of a tilttray.

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