Skip the auto shop - Our mechanics make house calls

Q: My 2001 BMW X5 won't start. I think it is due to power loss

asked by on

when i try to start engine it wont almost everytime. when it starts no power. i have changed fuel pump and still same problem

My car has 230000 miles.
My car has an automatic transmission.

Hello, the first questions to answer are "Are any problem codes set? Is your Check Engine light on?". Based on your observation of "no power", and your extended mileage, there are several problems likely that would result in "no power": your timing chain or valve timing components could be worn enough to affect timing and power. The catalytic converter could be clogged from lots of miles, and long term contamination. You don’t mention a misfire or overheating, but a blown head gasket could cause a no power situation, as well as worn piston rings. I would recommend having a Car Is Not Starting Inspection completed by a mobile, professional mechanic, such as one from YourMechanic, to diagnose this problem, get an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: my ml 320 has some noise along the serpentine belt passing thru pulleys my OBD 2 diagnises code P0221 which is for Throttle pedal

These problems are not related. But both problems are quite common on your model car. Your P0221 code refers to the throttle position sensor; a sensor that detects the amount that the throttle itself is open. You might not notice...

Q: Brake lights stay on

Your brake pedal may not be returning all the way. Because the switch is activated by the motion of the pedal, if the pedal does not swing back all the way to it's stop, it may not turn off the...

Q: 4x4 inactive and abs light

As a vehicle ages, sensors and monitoring systems can develop "glitches"; either due to excessive dirt and debris or the connections becoming loose. This can sometimes trigger system warnings as you've described above. Since the dealership was unable to determine...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...