We have a 530 diesel bmw ,fails to start if hot

Patricia Mitchell

• 41 Answers
• Posted on May 23, 2008

SOURCE: 1989 BMW 735i Hot start issue

You might want to try replacing your throttle return spring, or at least lift the hood and see if here is a change while it smooths out..

SOURCE: 1997 BMW M3 3.2 EVO

Your fuel injection pressure is probably leaking down causing gasoline to leak into the cylinders and resulting in a hard hot starting condition due to "flooding" of the engine. Try holding the accelerator pedal all the way to the floor of the car like your trying to go maximum speed down the highway and crank the engine for 10 seconds or less at a time. That tells your computer to enter the "clear flood" mode and stop injecting gas into the engine. Ask your repair shop to measure the fuel pressure and see if the pressure is bleeding off too rapidly.

SOURCE: My immaculate 2001 BMW 530 diesel occasionally

you may need to get a mechanic to cheak the crank angle sensor as if it is faulty if it gets into a certain position it wont let the car start

SOURCE: bmw e36 328i cuts out at idle,wont krank,runs rough at idle.

The battery could still be bad and if you don't have a totally good battery in the car it won't run right. Take to one of the parts stores and they can check it for you for free. Probably as simple as a battery.

SOURCE: i have changed rail pressure switch on bmw 530

Hi we have a similar fault on a 2002 X5 diesel with 140k.km
scan test on 'Autologic' says > low fuel pressure in rail under starting< we have done leak off test at diesel specialist and they say it needs #4 and #2 injector renewing, the low pressure from tank is at spec at approx.3.4bar whereas the rail press at crank is only between 102bar to 140bar on 6 diff scans, where i believe it should be at around 390bar, hope this helps, we still have not fixed this yet,