Question about BMW 525

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Hello there, i have BMW 525 E39 Car... the car engine is shaking while idle but smoother when i drive. at workshop, we checked the spark plugs, Coil, exhaust and change fuel pump. at diagnosis it says Cylender 1,2,4 missfiring. all the above didnt solve the problem , please advise

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There's a handful of possibilities. You said you checked the coil? There are 6 coils - one per cylinder above each spark plug. Regardless, you say it runs well when driving, it's at idle when it shakes - indicates a vac leak. Check the inlet tube (large rubber hose to intake) for cracks, also check all smaller vac lines in and around throttle body, Inside throttle housing is a fine mesh screen that could be clogging up. Also depending on mileage, you might have the injectors cleaned, they will get gummed up and stick at idle/low speed.

Posted on Jan 03, 2011

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