Quote:
Originally Posted by Fish71
Do a compression test. I have a 530I same engine and did the exact same as you, started repalcing the whole intake manifold/CCV/ignition/fuel system. Ended up with 175 psi on all cylinders except for #4 which was 100 psi. I was having a problem with #4 the entire time. I havent taken the car apart yet but with 135K I am having a hard time beliving it is rings. Im thinking a bent valve or a frozen lifter. Waiting for the weather to break and the X5 timing chains to be done before I tear into it. Always start with the most expencive problem and work backwards. LOL!
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 The computer will see a cylinder with low compression as a weak cylinder and assume the cylinder has a misfire so it will shut down the injector and throw up a SES light.
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