Mechanics

E39 LOSS POWER AND LONG CRANKING AFTER GETTING WARM

2001 BMW 540i

Hello Guys I have bmw e39 540i 2001, the problem happened this summer and till now its happening.
the problem is cranking and loss power.

usually in the morning the car start normal and run fine after it get the normal temper it begins to decrease it power and sometimes when I turn it off and then on it has a long crank then I turn in it on and then on the same thing, the third time it will turned on and have a sound (tuk).
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Bigmind69
October 3, 2012.



It could be a loss of compression. As engines heat up the gap between piston and cylinder wall changes and can affect compression. Also could be an issue with the fuel pressure. Get both tested and see if either is out of specification. Advance Auto ro Auto Zone lonas out free test tools.