Question about BMW X5 Series

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What is the problem with a Diesel BMW that will not start when hot.

Vehicle starts OK when cold, drives well but will not start when hot. What are possible reasons.

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  • BMW Master
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I would suspect vapor lock. The fuel rails are getting hot and it turns the diesel into a vapor instead of a liquid. A liquid is what is needed to go into the injectors. Try insulating all of the fuel lines with the shiny side out to reflect heat back to the engine.

Posted on Apr 17, 2015

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Posted on Jan 02, 2017

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hotrodtod38
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SOURCE: 2004 cummins diesel intermittent no start

GLOW PLUGS ?

Posted on Feb 14, 2009

jingB
  • 19 Answers

SOURCE: wont start when hot!

hello there, wow my dream p-up. nissan pathfinder 4x4,  unfortunately i have to settle with my nissan navara truck. anyways, the possible problems would be the injectors and injection pump. injectors are really direct on the combustion chamber so everytime the engine runs it is severely exposed to very high temperatures. the nozzle tips are the ones very much abused. the injectors have 2 seals. the first one which hugs the body of the injectors which is usually made of hard copper and the 2nd is called the chamber washer which is a stainless steel type concaved washer which serves as the nozzle tip seal and heat nozzle tip heat dispenser. if the nozzle tip floats there is a tendency that the tips are flame red due to heat thus, diesel is boiling to the point of turning to vapors enough to push the remaining fuel back to the injection pump when you shut the engine. then the one way valves of the injection pump comes into play. the valves might be weak and due to the high pressure, fuel slowly creeps back into the pump body. hope this helps.

Posted on Apr 16, 2009

  • 30 Answers

SOURCE: 2003 BMW 325i will start but making noise

It might be a faulty power steering pump. Try checking the level of the power steering fluid. It is probably best you have your power steering system checked by a mechanic.

Does the noise occur only when the vehicle is moving?

Try moving the steering wheel from side to side, while stationary (but don't do it too often, or you might damage something). If the noise is still present when the car is stationary, then it probably is the power steering system.

If the noise only occurs while the vehicle is moving, it could be a problem with the differential/final drive, or even wheel bearings.

Posted on Apr 21, 2009

  • 14036 Answers

SOURCE: 2003 Dodge Ram 3500 Diesel hot and cold start issues without plug

your glow plugs not working or glow plug relay or controller not working.

Posted on Apr 27, 2009

  • 97 Answers

SOURCE: bmw diesel wont start in cold weather, i have

YOU MIGHT HAVE TO INSTALL A BLOCK HEATER TO OVERCOME THIS PROBLEM

Posted on Jan 06, 2010

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BMW


Hi

It sounds as though you either have a faulty O2 sensor, or there is a fuel pressure issue, which from your description, could be due to a worn fuel pump.

If the car performs ok under full acceleration, but plays up at either part throttle or no throttle, then you may well have a faulty O2 sensor.

Very best regards

Geordie

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