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Old 12-02-2019, 12:08 PM
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Top speed problem?

Hi, being the idiot that I am I recently bought an old luxury car - the e53 3.0 D. Looked good at first check but didnt properly inspect this and that so there were a few things.

Anyways the car is driveable in the city however yesterday when I took it for a spin on a highway I was shocked to see that I couldn't get it going faster than 120 kph (~80 mph) @6th gear the car would simply not go any faster and engine would not go over certain ammount of rpm (can't remember exact ammount, maybe ~3000) it would just stay at those revs and not go up. Could this be a simple case of clogged up fuel or air filter or am I looking at something far more sinister like a effed up transmission (it feels dodgy sometimes)? Any suggestions? I really like the car
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Old 12-02-2019, 12:23 PM
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What codes are you getting?

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Old 12-02-2019, 01:07 PM
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There was a recent thread where the diesel wouldn't put out full power because of a vacuum problem (I guess used to control boost). Could be as simple as that.

I'm guessing you have not driven a similar car to know if the acceleration is on par. The D has a shitload of torque and has a very snappy launch. If you aren't seeing that, something is amiss
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Old 12-02-2019, 04:59 PM
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Quote:
Originally Posted by andrewwynn View Post
There was a recent thread where the diesel wouldn't put out full power because of a vacuum problem (I guess used to control boost). Could be as simple as that.

I'm guessing you have not driven a similar car to know if the acceleration is on par. The D has a shitload of torque and has a very snappy launch. If you aren't seeing that, something is amiss
+1 on everything Andrew said - you need to determine that state of the boost system. With a pooched turbo (or failed turbo boost control) I would not be surprised if it won't get above 3,000rm in top gear...

First thing you need to do it verify any DDE (engine ECU) codes - using software tools that are designed for BMW M57 engines - not just a generic ODB tools. Any serious boost control failure will present codes.

BTW, what year 3.0D do you have? Build dates up to Sept 2003 should be 135kW and from Sept 2003 onwards (until late 2006) should be 160kW.
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Old 12-03-2019, 05:00 AM
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Hi, will try to get diagnostic. It's a 2006 X5.
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Old 12-03-2019, 05:38 AM
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Quote:
Originally Posted by andrewwynn View Post
There was a recent thread where the diesel wouldn't put out full power because of a vacuum problem (I guess used to control boost). Could be as simple as that.

I'm guessing you have not driven a similar car to know if the acceleration is on par. The D has a shitload of torque and has a very snappy launch. If you aren't seeing that, something is amiss
Do you remeber the title or have a link?

Regarding acceleration it does not feel particularry slow and if i pedal it then it has no problems overtaking other cars. It feels fine in the city, only transmission is a bit dodgy for me as it likes to hold gears arround 2 k revs, i would like it to shift to next gear faster tbh... But somebody told me it's normal as these gearboxes are slow and not sporty I dunno...

Also I noticed it consumes a lot of fuel it shows average of 15-16 l/100 km on odometer if that is to be trusted in city (winter).
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