940 & 960 Timing Locked atdc. B230ft. Wasted Spark

Timing appears to be locked atdc. Wondering what could be causing this issue?

B230ft with wasted spark ignition.

Comments

  • Idle is around 1000-1500

  • Have you checked the EZ-K for codes? If it''s throwing 3-1-1, you're losing the speed signal somewhere.

    Also, which type of wasted spark board are you using - the US (Buchka) or Dutch (Bijlsma) one?

  • That would make sense bc I haven’t wired the speedo yet as I don’t have the connector for it since the 240 the motor is in now had a mechanical one. Ill find a plug soon hopefully.

    As for the wasted spark board I’m using the buchka one.

  • jamesincJames @jamesinc Oz Volvo Ice Fortress

    Could be load signal issue from the ECU, could also be a knock sensor issue.

  • bgpzfm142bgpzfm142 @bgpzfm142 Launceston TAS
    edited April 24

    Ahhhhhh... so this is a swap of a 940 engine into a 240...

    Well, there are 5 3 ways you can get a speed signal without changing the diff.

    1. If you have an early 240 mechanical speedo cluster (up to YM 1980, square speedo, with small tacho in the middle) you might be able to use a inline VSS device, which fits between the speedo and the speedo cable, possibly something like one of these -

    I haven't used one of these myself yet, but I'm planning to, since I'm fitting an LH2.4 engine into a K-Jet 240 and I don't want to change the speedo cluster.


    .2. If you have a later model mechanical speedo (YM 1980 to 1984.5, carb or K-Jet, round speedo, round tacho or clock on the left of the speedo) you might be able to re-use the cruise control output of it to provide a VSS signal to the LH2.4 ECU. Details at the links below -

    http://forums.turbobricks.com/showpost.php?p=5816970&postcount=13

    http://forums.turbobricks.com/showpost.php?p=5943114&postcount=15

    http://forums.turbobricks.com/showpost.php?p=5954896&postcount=20


    .3. If you have a later model electronic speedo for LH 2.4 (YM 89 on, round speedo, round tacho or clock on the left of the speedo), you can replace the speedo drive at the gearbo with an electronic sender, and the VSS signal is then supplied to the LH 2.4 ECU in the usual manner.

    Also, you may already know this, but there was a mixup with the labeling of the outputs of the Buchka wasted spark board - details at the link below.

    http://forums.turbobricks.com/showpost.php?p=5711020&postcount=378

  • Does the LH2.4 have a specific pulse count requirement for each km/h?

  • Timing problem solved! For some reason when i wired up the wasted spark system i thought i had to keep the original igniter. I unpluged it and now timing is normal and advances with revs.

    As for the speedo I’ve already swapped in a diff with a 48 tooth tone ring and sensor. I assume i can wire in a clock divider to scale the pulses back to 12 per rotation so the speedo reads correct.

    Would anyone know where I’d be able to buy one of those 3pin L shape connectors for the gauge? Or will I need to find a second hand one?

    jamesincbgpzfm142
  • jamesincJames @jamesinc Oz Volvo Ice Fortress

    Would anyone know where I’d be able to buy one of those 3pin L shape connectors for the gauge? Or will I need to find a second hand one?

    I couldn't find any for sale online, but you should be able to grab the tail light connector (pictured below) from a 240 and cut off three pins and make your own.


  • DCW242Duncan @DCW242 - Western Victoria

    I have plenty of those connector pins avaiable, second hand in good condition.

  • Sweet! Thanks for the help guys 👍

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