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mantadoc last won the day on July 20 2017

mantadoc had the most liked content!

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About mantadoc

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    Manta Guru

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  1. Early 1800 coupe restoration

  2. ¢ordy$hine

  3. ¢ordy$hine

  4. Gte?????

  5. Gte?????

  6. 20XE retarded timing issue.

    I get you now, so fixed dizzy with no mechanical advance yes? Looking at the chopper for the sensor they have 1 hole not 4 like on a Manta. That essentially means, in my head, they are using it like a crank position sensor almost but only fires every other revolution? If there is a crank sensor as well I would have no idea why they would do it that way, except to track camshaft position to indicate which cylinder is on firing stroke, but of course if using a dizzy cap the management has no need to know about which cylinder is on firing stroke. Thanks for the explanation as I always like to understand the solution to a puzzle Re the firing well before, when trigger wheels are used on cranks, the missing index tooth is well before TDC to give time to process the info and fire
  7. 20XE retarded timing issue.

    Sorry, just trying to understand, but the systems where the ECU does the timing don't (AFAIK) use mechanical advance, they often have a bigger rotor arm, and fixed shaft and the dizzy just distributes the spark and does not time. There is no logical reason for an ECU that controls timing to take a signal from a mechanically advancing distributor. That was the jump in things like motronic 1.5, soon after people realised they could ditch the dizzy and go wasted spark. Even with the dizzy rotor offset you said you timed it with a timing light so that negates that offset so I suspect something else w s done to fix rather than just timing, like making it static or reassembly causing the top half to be the other side of the stop. It appears we are on crossed purposes and I just wanted to understand the issue and fix.