Question about 2005 BMW X5

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Power loss and smoking

Diesal x5 turbo 4.4

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  • Thomas F. Schneider May 11, 2010

    Oil changed lately?
    Black or blue smoke?
    Same supplier of fuel?

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  • 28 Answers

3 poss one (injector) two (turbo) three (agr valve)

Posted on Jan 18, 2009

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Power loss and smoking


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Hi, I have an BMW X5 56 plate 3.0diesel. 41k miles. I have noticed that there appears to smoke coming from the exhaust upon acceleration. This is happening all of the time. Also, yesterday I lost power (as...


Have a go at the Positive Crankcase Valve (PCV). its located under the engine cover towards the rear of the engine in an odd shaped black plastic box alongside the fuel injectors, Dont pay BMW the Big dollars. Buy a filter for $50 AuD on Ebay or the whole unit for $120 AuD. You have to remove the engine covers to do it but thats not so hard really, just a bit involved and takes 10 mins to remove the engine cover. The actual filter is a throw away job, but the whole PCV assembly is just a degrease and clean. Its held in place by four small hex headed bolts, when you lift it you'll find the small can shaped filter pinned underneath. Swap the filter. its VERY unlikely to be your turbo at 41,000m.
The PCV is a known issue that causes smoking and even power loss, BMW actually did a retrofit kit PCV for use in cold climates., Are you in somewhere cold? and another possibility is not using the correct 'Winter diesel' in a cold spot. Very common fault for X5 owners going up to Thredbo or Perisher snowfields in Australia for the first time!
Happy Motoring

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X5 diesal blue smoke


Hi , if you have had a turbo failure on this vehicle , just replacing the turbo will not cure the cause of blue smoke . depending how bad the seals had gone in the turbo you would need to replace , the complete exhaust system , the crankcase breater , air intake manifold , air charger but only if these items have been contaminated with oil , they would not be able to be cleaned out , hope this helps , regards mark

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chances are your turbo pipe has come off near the back of your drivers side headlamp, where it gos into the inner wing to the intercooler. hope this helps

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Power loss and black smoke?


I had a similar issue to this after I got in a VERY small fender bender (literally) in an 87 Turbo Supra. In my case, my pasenger fender got pushed in JUST enough to crack a charge pipe and cause a boost leak.

Basically, what was happening was the turbo would spool and build boost, the mass fair flow sensor would read all this air coming in and tell the ECU to dial up the the appropriate amount of fuel. When the air reached the cracks in the charge pipe, it would escape out of them. Thus there was a much lower air-to-fuel ratio, causing less fuel to combust, which lead to power loss and black smoke out of the exhaust.

My guess is either an oxygen sensor, or more likely a boost leak.

Good luck mate.

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