Blow-back during warm engine start
Posted: Tue Feb 19, 2008 8:12 am
I use MJLJ for my BMW 1.6 LPG fuel only engine. I created ignition map, and it runs OK apart from one problem.
When the engine is warmed-up, I get single blow-back when starting (the very moment it starts) if I slightly press on a throttle pedal.
This does not happen with my original ignition system. I am about to record ignition map of BMW original ignition system (I just managed to repair my timing light) when weather allows.
I attached my ignition map. Why is this happening? I guess too much advance, or too lean mixture. If you look at the map you should know that LPG wants more advance at low rpm, and less at high.
When the engine is warmed-up, I get single blow-back when starting (the very moment it starts) if I slightly press on a throttle pedal.
This does not happen with my original ignition system. I am about to record ignition map of BMW original ignition system (I just managed to repair my timing light) when weather allows.
I attached my ignition map. Why is this happening? I guess too much advance, or too lean mixture. If you look at the map you should know that LPG wants more advance at low rpm, and less at high.