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: Gears get stuck and hearing some noise in the exhaust. Some running noise that doesnt sound normal when parking. 1996 Mazda Miata

Hi there - either your clutch hydraulics (master/slave cylinder) are weak, or something wasn't done right with your clutch repair. It shouldn't fail so quickly. Either the clutch is dragging because the clutch hydraulics are weak, or the pilot bearing...

Q: Ford KA battery light on, replaced but stilll on. Car Idles very low and cuts out if not driving.

Hello, thank you for writing in. From the sound of it, you may be having an issue with the charging system. You will want to have the alternator inspected. There are tests that can be done while on the vehicle...

Q: Car overheating

Overheating is never good for any vehicle. It can be caused by many things like a bad thermostat, low coolant due to a leak, a clogged radiator, a bad water pump, etc. A blown head gasket is the byproduct of...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.