Noisey Engine

fisco2001

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Hi guys n gals.
i got a 2002 plate 3 series
lately when i start it up, the rev counter starts to jump around a little,
and gear stick starts shaking and i get a knocking noise which can hear in the car. and the car seems to shake ever so slightly, if turn off the ignition and re start it will be ok for a little while then starts all over again

any ideas
much appricated.
 

HORUS

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does it happen just after it warms up slightly ?
reason ime asking as they suffer from pcv or engine breathers splitting causing weak mixture misfires
also coil packs are common as said previosly
 

HORUS

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maybe be an air leak ?
as after it starts the mixture weakens of as injector time gets lower (like a choke)
to bring mixture down
my bet is an air leak would try that thought on tyhe garage first
as if it were a coil it would miss from start up more or less although it is harder and needs more effort from the coil to ignite a weaker mixtutre ?
but ide first investigate temp in live data then check for leaks in inleet manifold and all the pipes and pcv (engine breather) valve

HYH
 
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fisco2001

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Ayt Guys was driving me car today,
the engine light popped on.
had a look in the manual it says somthing on the lines of "Exhaust Valves Deteraiting Need Replacing" could this casue me car to shake as mentioned above.
as is exhaust valve a big job
 
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