BMW F10 N53 injectors and cold-running jerking
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Why does the F10 523i N53 jerk when cold?
The most common cause is a leaking injector. The fault is worse when cold and milder when warm, and the car may give a Drivetrain fault message. A wet spark plug points to a leaking injector. Injectors are a known weak point of the N53.
What else is checked besides the injectors?
The ignition coils and spark plugs. Misfires can return if only one plug or coil is replaced. A weak battery can also cause random fault codes, so check the battery and its cables.
What should be taken into account when replacing the injectors?
A tight injector needs a slide-hammer type tool to remove it. After the replacement the injectors are coded to the car. The quality of cheap reconditioned injectors varies, and some leak. The rest of the part number can be seen on the side of the injector when the engine cover is off.
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