Question about 2000 BMW 3 Series

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Hi I have 2000 BMW 320i. Lumpy idle when cold and oil light for

Hi I have a 2000model BMW 320i. I have just had major service including spark plugs and coil packs. Car starts rough with engine shaking on idle when cold..car runs terrable until i restart it and then runs perfect. If i start it and put it into drive immediately and take off problem disapperas within minutes and then runs perfect. Oil warning light is also coming on after 3 seconds of turning on the motor then goes off again after 10-15 seconds and doesnt come on again until i restart the car. the oil light is consistant at every start up but lumpy idle is usually first start of the day or when the engine is cold on a damp day. any ideas??

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  • rachael_hand Jul 08, 2009

    sorry, have checked oil level and have now had the oil level sensor replaced which has fixed the oil light coming on however the car still has rough idle when cold... after replacing coil packs, spark plugs and the thermostat sensor have now been told by my BMW specialist that it is more than likely due to lifter problems.

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Your oil is a little low, and the timing may be off a bit but if it smooths out after warm it is probably ljust
low oil.

Posted on Jul 08, 2009

  • Patrick Razvoza Jul 08, 2009

    I am sorry to hear this if I had know the rest of your story I would not have suggested the oil level. Good Luck To You !!

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Hi Retze

From your report on the symptoms of your problem, it definitely points to an electrical problem, which is aggravated by cold and damp.

The smell of fuel in your oil, points directly to a misfire and non combustion on one, or more cylinders, and the subsequent unburnt fuel washing down the bores and into the fuel, thus breaking down the viscosity of your oil, and going to give you premature , and excessive wear on your engine before too long, if not already.

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This will hopefully give you a clue, as to the problem cylinder/s.

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Now as to my gut feelings as to where your problems may lie ?

I too suspect the spark plug coils, as they are problematic with BMW, as they are also, with my specialist subject, Jaguars.

They are sometimes difficult to fault, as the problem can be intermittent.
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I am also very concerned as to how long ago you changed your engine oil & filter, as if you can smell the fuel in your oil, it must be thinned down considerably, and also affecting your hydraulic valve lifters.
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Your first line of attack is remove the spark plugs, and inspect those plugs !

Let me know what you find, and give me your feedback as to your thoughts on my comments.

Good Luck !

Remember to give me a rating if you think I have been of assistance, thanks !

John.







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