Question about 1999 BMW 328 Series

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99 328I BMW

SO MY HUSBAND FIGURED OUT IT WAS JUST THE THERMOSTAT WHICH WE REPLACED BUT SHE STILL LOOSES POWER, ITS ALMOST LIKE A LIGHT PULL BUT THEN SHES FINE, EXCEPT 4TH AND 5TH SHE DOESNT HAVE HER KICK IF YOU WOULD SAY NOT AS MUCH GUTS, AND SHE HAD SUM GUTS. I RESEARCHED WHICH IS HOW I FOUND YOU, THAT ITS COULD BE THE VANOS SYSTEM, WHAT DO YOU THINK

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  • cilla4myblas Sep 18, 2008

    yeah but i had the loss of power before the overheat. and we changed the fliters:oil, air, fuel, before it had overheated. it seems like the injectors are clogged or really dirty



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  • BMW Master
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Hi Cilla

The variable valve timing, may have been effected by the over heating.....I'm sure that you're already thinking what I'm thinking.....A change of oil and filter would be a good idea.... I prefer a good quality, fully synthetic oil for high performance engines....

The operation of the variable valve timing is very simple ....The computer opens a valve for either the inlet or both cams, which in turn allows engine oil to be pumped into the camshaft gear assembly and thereby force the valve timing to advance via a sealed and encased viscous coupling.....

If the oil has been damaged by the over heating, that could be the problem....I'd still suggest that you carry out the tests, which I suggested in an earlier communication to you.

Best regards Johngee10



Posted on Sep 18, 2008

  • Hi Cilla,

    This is the first time that you've mentioned the sequence......ie; loss of power first and then the over heating....As you say that you've replaced all the filters, I would think that they're all ok and in the clear....Have you replaced the plugs?.... A drop off in power, but only in a few of the gears, would seem unlikely, unless you are not aware of the drop in the lower gears.....



    I think that you may like to replace the gear oil, just in case it has become damaged with the overheating....



    In your position I would get the electronics scanned....You may have a problem with one or more of the ignition coils.....I'm very doubtful that the injectors could be blocked.....though it's not impossible....If you have a blocked injector, it would usually result in the blocked ones giving a misfire, or failing to close, resulting in flooding.....



    Your best way forward, in my opinion, is to have it scanned.....That's why the on board diagnostics are fitted....



    Regards Johngee10

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