Boltwizard Posted May 10, 2022 Report Share Posted May 10, 2022 Attached tune and log. KA24DE in an s13. The RPM signal drops out over 6000RPM. Tach goes to zero for anywhere from 2-6 seconds but only shows as a single frame in the log. My tuner recommended replacing the Distributor/Cam Angle Sensor, but they are discontinued and I'm having a hard time tracking one down. Are there any other possible causes for this or any fixes worth trying while I track down parts? PC Datalog - 2022-05-9 6_31_37 pm.llgx eTune#3.pclx Quote Link to comment Share on other sites More sharing options...
Vaughan Posted May 10, 2022 Report Share Posted May 10, 2022 Can you take a trigger scope up around 5500rpm? Also possibly unrelated but from memory Trigger 2 Edge should be set to All Quote Link to comment Share on other sites More sharing options...
Brad Burnett Posted May 10, 2022 Report Share Posted May 10, 2022 I recently fought with dizzy issues on a Nissan Vg project. I got a local parts store reman unit and all was happy afterwards. The optical pickup was failing in the originally supplied unit, which is a common issue these days on OE units. Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 10, 2022 Report Share Posted May 10, 2022 Yeah in RB's I have seen as the optical sensor gets old the rise/fall time gets slow and this causes the width of the trigger 2 slots/windows to get shorter than they should be at high RPM. So for example the ecu may expect the longest trigger 2 slot to be 24 trigger 1 teeth wide - but at medium RPM it only covers 23 teeth, then at high RPM it drops to 22 teeth and the ecu is not happy. The ECU has a +/-1 tooth tolerance on the trigger 2 widths. One possible option would be the AEM 24slot disk. Start up will be slower, but the width of the slots no longer matters with this type of trigger pattern. https://www.aemelectronics.com/products/sensors-connectors-accessories/nissan-cam-angle-sensor-discs Quote Link to comment Share on other sites More sharing options...
Boltwizard Posted May 14, 2022 Author Report Share Posted May 14, 2022 On 5/10/2022 at 6:10 PM, Adamw said: Yeah in RB's I have seen as the optical sensor gets old the rise/fall time gets slow and this causes the width of the trigger 2 slots/windows to get shorter than they should be at high RPM. So for example the ecu may expect the longest trigger 2 slot to be 24 trigger 1 teeth wide - but at medium RPM it only covers 23 teeth, then at high RPM it drops to 22 teeth and the ecu is not happy. The ECU has a +/-1 tooth tolerance on the trigger 2 widths. One possible option would be the AEM 24slot disk. Start up will be slower, but the width of the slots no longer matters with this type of trigger pattern. https://www.aemelectronics.com/products/sensors-connectors-accessories/nissan-cam-angle-sensor-discs Your explanation makes sense and the AEM disk solved my problems. thank you! Quote Link to comment Share on other sites More sharing options...
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