Garthroser Posted May 13, 2015 Report Share Posted May 13, 2015 Hello, I'm at the moment struggling to get my BMW E30 M3 S14 engine to start with an i88. I did a complete rebuild of the car and the engine - now everything is finished and we wanted to fire up the engine, but it's not starting correctly. If we try to start it, it's backfiring trough the throttle bodies, sometimes into the exhaust or even in the compression phase. When we crank the engine and check with the timing light the TDC everything seems to be correct. The sensor on the crank shaft trigger is located about 90Â° before TDC and with the strob light we catch the TDC mark at around +90Â°. The ECU shows while cranking about 250 rpm - which seems for me correct and doesn't show any trigger error. When we try to start the engine, at one stage it backfires and then we get an trigger error - the rpm's go somewhere. We tried already several ignition angles, fuel injection timings, checked if the timing is not 360Â° offset, etcâ€¦ It seems like the ignition timing is way off, but if we check the values it looks correct! Injector test done - ok Ignition test done - ok Oscilloscope check of trigger 1 & 2 - looks ok Ignition cables checked & changed - no change Wiring pin layout checked - couldn't find anything wrong Sensor & power ground checked - couldn't find anything wrong Details to the engine: BMW S14 engine 2,3 L naturally aspirated Crank trigger wheel 36-2 reluctor/inductive type sensor Cam trigger BMW E34 M5 reluctor/inductive type sensor LS1 single ignition coil Injectors Bosch 0 280 150 804 Mapped by TPS Has somebody experienced similar issues? Somebody a good idea what could be the problem or what to test? Thanks & regards Andreas Quote Link to comment Share on other sites More sharing options...
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