Running rebel Posted August 31, 2022 Report Share Posted August 31, 2022 I have a 3 wire reluctor sensor on a bmw. Picture attached. Issue I am have is swaying timing when syncing timing base. Can anyone tell me correct pins for this sensor as I think this might be the issue. Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 31, 2022 Report Share Posted August 31, 2022 What engine? Can you attach your tune and a trigger scope. Quote Link to comment Share on other sites More sharing options...
kevin p Posted September 9, 2022 Report Share Posted September 9, 2022 Hi Adam, It's a S38 3.8l. I'm helping out on the project. I will forward you the scop and map. Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 9, 2022 Report Share Posted September 9, 2022 Quote Link to comment Share on other sites More sharing options...
kevin p Posted September 9, 2022 Report Share Posted September 9, 2022 Ok, that pic you sent would make an Optical/Hall sensor correct? Quote Link to comment Share on other sites More sharing options...
Vaughan Posted September 9, 2022 Report Share Posted September 9, 2022 25 minutes ago, kevin p said: Ok, that pic you sent would make an Optical/Hall sensor correct? 3rd wire appears to be the shield making it a two wire sensor, looks like a reluctor to me. Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 9, 2022 Report Share Posted September 9, 2022 Reluctor. In the pic, left pin = out= signal. Center pin = gnd. Right pin = S = Shield. Usually VR sensors that have a pig tail or lead will have 3 pins so that the lead is shielded. Whereas VR sensors with the plug moulded directly on to the sensor only have 2 wires as they dont need the shield. Quote Link to comment Share on other sites More sharing options...
coreyb Posted November 3, 2022 Report Share Posted November 3, 2022 UPDATE: Still getting large sway on timing when trying to calibrate. We have tried new sensor, made a separate harness for crank sensor still no luck Car has a MSD ignition box could this be an issue and does it need a particular trigger setup? Any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 3, 2022 Report Share Posted November 3, 2022 Spark edge needs to be set to rising for MSD. Also, still waiting for this: On 9/1/2022 at 9:36 AM, Adamw said: Can you attach your tune and a trigger scope. Quote Link to comment Share on other sites More sharing options...
coreyb Posted November 3, 2022 Report Share Posted November 3, 2022 Thanks have the spark edge as falling.....will try it at rising. I assume would have to resync ? Here is scope and latest map NewCrankSensor-v1.pclx TriggerScopeLog_Newsensor.llgx Quote Link to comment Share on other sites More sharing options...
koracing Posted November 3, 2022 Report Share Posted November 3, 2022 Yes you will have to resync after changing the edge but it shouldn't move a lot. Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 4, 2022 Report Share Posted November 4, 2022 Scope looks ok. Note since you have no cam sensor you should use multipoint group mode, semi-sequential is only possible with a trigger capable of 720 sync. Quote Link to comment Share on other sites More sharing options...
coreyb Posted November 7, 2022 Report Share Posted November 7, 2022 Got the sync working correctly. But now with the multigroup setting car sounds and act like its not firing on all cylinders. its a 6 cylinder and using a STORM dont know i mentioned this before............a help would be appreciated. Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 7, 2022 Report Share Posted November 7, 2022 Will need a log and tune. So are you saying it was running better before? What has changed - just the spark edge and re set base timing? Quote Link to comment Share on other sites More sharing options...
coreyb Posted November 7, 2022 Report Share Posted November 7, 2022 changes were spark edge, re set base and change to multipoint group. NewCrankSensor-v2.pclx PC Datalog -multipoint 2022-11-6 7;03;20 pm.llgx Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 7, 2022 Report Share Posted November 7, 2022 There are a few odd effects in your log: Battery voltage is very erratic and alternator is not charging. MAP is quite erratic and very high (ie barely any vacuum at idle) There are patches of erratic movement on the TPS trace, this doesnt look like it is someones foot doing that. The erratic battery voltage may suggest there is a bad ground, possibly the main 12V supply to the ecu is missing (ecu pin 5), or some other loose connection somewhere. You could try disconnecting the alternator just to confirm it isnt caused by a bad diode in that or something. The erratic MAP and very little vacuum usually indicates a mechanical issue, but one possible explanation - does this engine maybe have ITB's? Whats your thoughts on the TPS signal - were you really working the pedal hard or is that a genuine issue? One other thought - have you checked rotor phasing? Quote Link to comment Share on other sites More sharing options...
coreyb Posted November 8, 2022 Report Share Posted November 8, 2022 7 hours ago, Adamw said: There are a few odd effects in your log: Battery voltage is very erratic and alternator is not charging. . MAP is quite erratic and very high (ie barely any vacuum at idle) There are patches of erratic movement on the TPS trace, this doesnt look like it is someones foot doing that. LOOKS LIKE WHEN IDLE WAS TRYIING TO BE RAISED.....TPS IS GENERALLY VERY STABLE The erratic battery voltage may suggest there is a bad ground, possibly the main 12V supply to the ecu is missing (ecu pin 5), or some other loose connection somewhere. You could try disconnecting the alternator just to confirm it isnt caused by a bad diode in that or something. YES WE REALISED VOLTAGE DROP AS WELL....BATTERY CONNECTION MAY HAVE BEEN THE ISSUE...LOOSE POSITIVE LEAD The erratic MAP and very little vacuum usually indicates a mechanical issue, but one possible explanation - does this engine maybe have ITB's? YES...ITBs Whats your thoughts on the TPS signal - were you really working the pedal hard or is that a genuine issue? MAYBE WHEN WE TRIED TO MOVE CAR..............GENERALLY TPS IS STABLE One other thought - have you checked rotor phasing? NO Quote Link to comment Share on other sites More sharing options...
coreyb Posted November 19, 2022 Report Share Posted November 19, 2022 Issue resolved It was the trigger setting. Thanks for all the help. Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 20, 2022 Report Share Posted November 20, 2022 What trigger setting? The trigger was working fine in your last map and log. Quote Link to comment Share on other sites More sharing options...
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