PORSCHE951 Posted August 29, 2014 Author Report Share Posted August 29, 2014 The problem happens when reving at idle or driving under load. Honestly cant remember the peak voltage of the signal however I know it was more then the arming voltage, constant strong signal that never dropped out. I also dropped the arming voltage to as low as 1.5v across all rpm range and the problem still existed... Should probably mention the crank sensor has been replaced and gapped properly due to the old one being damaged from previously touching the flywheel/ reluctor teeth. (The problem has existed before and after sensor replacement). Quote Link to comment Share on other sites More sharing options...
Gsab Posted August 31, 2014 Report Share Posted August 31, 2014 I have had a sensor touch the trigger wheel and get chewed by about 2mm -it had come loose at Kyalami-. Still worked perfectly but changed it out for new. Not sure of your trigger setup but if it helps, mine was loosing the sync at about 7k.Just garbled info to the ecu and would cut dead.Tracked it down to a too small a trigger plate within the 360 sweep.ie: signal was marginal to start off with and then was lost. Simon suggested a 180 deg "raised lump/trigger" on the cam and that solved my problem. Quote Link to comment Share on other sites More sharing options...
Simon Posted September 1, 2014 Report Share Posted September 1, 2014 Any chance of getting a scope image of the triggers at crank and then again at the point the trigger errors are clocking up. Quote Link to comment Share on other sites More sharing options...
PORSCHE951 Posted September 1, 2014 Author Report Share Posted September 1, 2014 Yeah I can try. I'll take the car into my work Wednesday and scope the crank signal again with the Snap-on Modis. I'd like to make this work rather then using an alternate trigger wheel... especially since the wave form would remain flawless on the Modis screen even when errors were counting at ~4800 rpm and the engine was missing. Quote Link to comment Share on other sites More sharing options...
Simon Posted September 2, 2014 Report Share Posted September 2, 2014 If at all possible having both the cam and crank signals on the screen at the same time would be really good. Quote Link to comment Share on other sites More sharing options...
PORSCHE951 Posted September 2, 2014 Author Report Share Posted September 2, 2014 The car uses 2 crank sensors and no cam sensor, but yes i will try and plot both on the screen... from my understanding trigger errors will only count if there is a problem with trigger 1 (crank, rpm sensor) ? Quote Link to comment Share on other sites More sharing options...
Simon Posted September 2, 2014 Report Share Posted September 2, 2014 Its a combo of both in puts If it misses a sync pulse it will clock an error, much the same if it sees or misses pulses off the main trigger 1 input. Quote Link to comment Share on other sites More sharing options...
PORSCHE951 Posted September 10, 2014 Author Report Share Posted September 10, 2014 So I scoped the crank sensors and monitored them at idle and high rpm and did not see any drop outs.. had a problem uploading the scope data to the cpu so all I have is a lame pic of the triggers at idle. I did make a log and monitor it where I found the dwell time is cutting out when my misfire happens while trigger 1 and trigger 2 voltage and signals remain ok. also noticed a limits flags word 1024 which displays shortly before and after the misfire / ign cut event... no idea what that means. I tried to upload the log but it says the extension llg is not allowed? Quote Link to comment Share on other sites More sharing options...
Simon Posted September 11, 2014 Report Share Posted September 11, 2014 The limits flag is an interesting one. This would indicate that we are cutting for a reason. If you could email the log and PCL file to me at [email protected] Quote Link to comment Share on other sites More sharing options...
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