I'm struggling to find the cause of the intermittent starting issues.
When cold it cranks and starts normally.
If I drive it so it reaches normal operating temperature it most likely wont start when hot, just cranking.
If I wait to the engine is cold again after leaving it over night, it will start.
INPA show this error code: 2550 rail pressure control at start
Pre pressure is approximately 3.7-3.8 bar with ignition on and doesent drop below 3.6 bar at full load.
Fuel filter is new, pre supply pump is running, a half litre coke bottle is filled in the time I use to turn on the ignition and walk to the engine bay and check it.
You are absolutely right about that. I may have been to caught up in the error code.
Wouldn't the cam sensor throw a error code though?
When disconnected it throws a code.
Did take it out and it's the original one with 300000km on it
Did in fact have some similar intermittent starting issues on my 540i with longer and longer cranking time. Then I changed cam sensor and it fired right up every time. It did not throw any codes either.
Its an odd because it tends to throw other codes like smooth running faults which leads you off on a wild goose chase with injectors! The cam/crank sensors only throw codes when they are proper dead, either short circuit or open circuit overwise they have no other built in diagnostics
Most likely a leaky injector. You can do a leak test quite easily if you just have hoses to leak off lines on top of injectors. Max permissible leak off 20 ml @ 2 min.
I did a non scientific leak down test of the injectors by disconnecting the return lines even though its very messy.
That reviled that two out of 6 injectors are leaking like a water fall...
I guess I have had one leaking injector for quite some time due to the error code and now two that results in hard warm starts.
Replacement injectors are on its way
Thanks for all the reply I've got.
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