Intermittent trigger issues

[sbn1979]

Morning 

We have an Evo 8 with a thunder running 18-1 trigger, base timing set at 110 and runs fine no issues when it runs, drives fine, however even when warm theirs a 1 in 3 chance it wont start again and trigger error counter rises, new sensors crank sensor, wiring checked, cam sensor is disabled, is it still looking for something ? Weve based this trigger setup of another car i had with no cam position that worked fine and started every time, thanks

 

SWTest.pclr Trigger Scope Log 2023-12-10 10;16;16 am_basetimingset_110.llg

[Adamw]

You will need a cam sensor for direct spark ignition.  With no cam sensor the ecu has no idea whether it is TDC compression stroke or TDC exhaust stroke so will get it wrong approx 50% of start attempts.  

If the other car with no cam sensor started reliably then it must have been using wasted spark ignition - but your injection timing would have been randomly incorrect in that case too.  

[sbn1979]

6 hours ago, Adamw said:

You will need a cam sensor for direct spark ignition.  With no cam sensor the ecu has no idea whether it is TDC compression stroke or TDC exhaust stroke so will get it wrong approx 50% of start attempts.  

If the other car with no cam sensor started reliably then it must have been using wasted spark ignition - but your injection timing would have been randomly incorrect in that case too.  

You know what Adam you are bang on, that’s the only thing I’ve overlooked here and yes the other cars have been wasted spark, excellent thanks for the input