Skip the auto shop - Our mechanics make house calls

Q: Loss of power and rattling from back under part 1998 BMW 323

asked by on

The car runs but when I get to a higher speed like 50 to 60 mph the car loses power and starts to shake ,I have to pull over then it dies..I left the car without driving for a few days then I turned it on and the rpm was slightly under the 1where it usually sits...and when I press the gas slightly I can hear a metallic rattle coming from the rear under the car..the car stays on I took it for a test drive it did good while going slow but a the speed when up it started loosing power.what could be the problem

My car has 140000 miles.
My car has a manual transmission.

A: Hello - I believe you have 2 unrelated prob...

Hello - I believe you have 2 unrelated problems: the loss of power, and the rattle. I believe your loss of power problem is either a failing fuel pump, or possible a clogged catalytic converter. The fuel pump issue would have been noticeable over a few days or a week, whereas a clogged catalytic converter might have taken a period of weeks or months to notice - slow decline in power. If there are problem codes stored (Check Engine light), they will be most useful in diagnosing this problem. I would recommend an inspection to determine the source of the loss of power by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs. I would also recommend YourMechanic to inspect the vehicle for the source of the rattle you have observed.

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

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: Extreme power loss, engine rattling.

Using 15w-40 instead of 5w-30 could be the cause of your problem. Your engine has very small passages that lead to the valve train. One components in particular, hydraulic lifters, require a good flow of oil through a small passage...

Q: Engine Power Reduce error

There is a wire harness in the right floor pan area that may be out of position, and a stud is shorting it. The wiring would have to be fixed, and error codes cleared. The symptoms of this wiring short...

Q: My SUV is leaking oil

Hello. If it is the sensor right next to the oil filter, then that is the oil pressure switch. These are a common cause of leakage. The sensor itself will either leak around the threads or through the sensor itself....

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...