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Old 04-03-2006, 10:15 PM   #1
mz3bo
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e39 5401a - Missing Power

Hi,

Our E39 540iA is having some partial power missing problem. Sometime, there is no power for about 3 seconds and then, the power kick back. It can heppen anywhere, but most of the time, it's on highway. It feels like the car is shutting down for 3 sec and comes back to life... Anyone know what can be wrong ? Also, sometime, when you are at a stop light, the car stalls...

Thanks
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Old 04-03-2006, 10:18 PM   #2
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the cats could be clogged, it happened to my 540 a couple of years ago
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Old 04-03-2006, 10:32 PM   #3
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sounds like cats are done...whats the mileage on it?

Go replace it under warranty at the dealership if it's under 130,000K or 8 years. I did it twice already....
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Old 04-04-2006, 07:42 AM   #4
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Hi,

The cats are emty since it was gone and out of warranty.
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Old 04-04-2006, 08:04 AM   #5
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what? you mean you gutted the cat? I assume you running those o2 sensor simulator, may be check those out.
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Old 04-04-2006, 10:39 AM   #6
O.S.
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or a MAF sensor ...
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Old 04-04-2006, 11:25 AM   #7
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Quote:
Originally Posted by O.S.
or a MAF sensor ...
thats possible...mine was gone..but the car never stalled, it didnt have any power, but it never stalled...
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Old 04-04-2006, 11:26 AM   #8
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Quote:
Originally Posted by mz3bo
Hi,

The cats are emty since it was gone and out of warranty.
What do you do about passing emissions?????????
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Old 04-04-2006, 02:54 PM   #9
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Quote:
Originally Posted by myndgone
thats possible...mine was gone..but the car never stalled, it didnt have any power, but it never stalled...
it could, mine went bad and it stalled twice while coming to a stop.
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Old 04-18-2006, 11:23 PM   #10
windwagen
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My buddy's 540 MAF bought it, and it had similar symptoms. Eventually, the CEL came on as well as the trac light. If you were here in TO, I'd offer to scan the car for you.
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