Skip the auto shop - Our mechanics make house calls

Q: Loud cranking, shaking, RPM decrease upon start - 2004 BMW 325is

asked by on

The car has been making loud cranking sounds lately. This occurs when I start the car. It would also start shaking. The dashboard has been showing the RPMs slowly decreasing too. I'm in fear that this might damage the car badly, so I only start the car and let the engine run briefly. How serious is this problem? What should I do?

Hello. This problem would be considered very serious. I would recommend not driving the vehicle at all until it has been inspected by someone to determine the extent of the damage. Sounds like that are usually either harmful to the vehicle or very unsafe. Once your vehicle has been inspected, then from there you can determine which route to take as far as resolving the issue. This noise could be related to the engine. Engine noises can often occur due to lack of proper maintenance, low oil level, or wrong oil type. This would be the first thing I recommend having checked out. If you would need to have this checked, a qualified professional from YourMechanic can inspect the noise and the loss of power concerns for you.

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: Door locks and hazard lights unresonsive

I believe it is possible that you may have a problem with your keyless entry module/receiver. If this control module is not working properly, this can prevent certain features that are activated by the key fob from working. These features...

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

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...

Q: Small transponder stuck under navigation panel

Hello there, this is a rather rare issue. If the navigation unit has closed on the transponder then it is likely that the navigation unit was shut off for safety reasons when it jammed. The navigation unit assembly may require...

Related articles

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...