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Engine starts only with reverse crank sensor polarity.
* reverse of the factory? * or reverse compared to what should be good ? **reverse of the right polarity, VR sensor signal is rising. ( in this case I won around 10 degree of advance) |
| ***Tried, but nothing changed. The same result with 10-15-20kOhm pullup to +5V. We get good rpm values, but so far I can't adjust TDC with the ign_tdcdelay value. |
| The LCD and Megatune shows around the right RPM during cranking. |
| The LCD and Megatune shows the right RPM during cranking. |
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When I try to positioning ign_tdcdelay, I get only 3 possibility erratic crank angle (measured by strobe) as I change the value:
*BTDC around 80 degree *ATDC around 10 degree *ATDC around 100 degree |
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When I try to positioning ign_tdcdelay, I get only erratic crank angle (measured by strobe) as I change the value:
(ign_crank_advance=01 ,crank advance 0.25 degree) *ign_tdcdelay=C8 (100 degree) the timing light shows ATDC 10 degree *ign_tdcdelay=A4 (82 degree) the timing light shows BTDC 70 degree *ign_tdcdelay=AA (85 degree) the timing light shows ATDC 2 degree It's looks OK, but if I use the right crank advance (8 degree through the crank),then get spark BTDC 70 degree again. I can't make spark between BTDC 70 degree and ATDC 2 degree. ----- 2007-08-13 I do some measurement by scope with 15kOhm pullup to +5V on secondary trigger (both sensor conected with the right polarity) : [Scope screenshot for details] Cranking around 210-220 rpm CH1 - cam signal CH2 - crank signal These are looks good for me, but I'm not sure of course, because the problem with the spark advance is still the same. |
![[Scope screenshot for details]](http://www.metatron.hu/karesz/crank2.JPG){kind=link}