Skip the auto shop - Our mechanics make house calls

Q: Loss of power and misfiring in 2000 BMW 323CI

asked by on

I have a 2000 BMW 323CI. I'm having problems. When it first starts it is fine, but when it warms up to a normal temperature, I have a loss of power and it misfires. Sometimes when I first start, it's only fine for a couple of minutes.

The first thing you want to check is on the driver’s side, the intake manifold and all the plastic there is between the radiator and the engine. You may barely even see them without a flashlight and a little mirror. Check for vacuum leaks and all that plastic cracks, because if it has cracks, it leaks air and does exactly what yours is doing.

The other thing you should do is have a good mechanic put up a scan tool and check the MAF sensor, because a lot of times it’s the MAF sensor. The MAF will go bad on those and do exactly that. If it is that, take my advice and buy a factory sensor, don’t buy those cheaper ones made in China, because they just don’t work on a BMW. Have this inspected by a certified technician, such as one from YourMechanic if you need help. They will be able to diagnose your car’s loss of power and misfiring issues so you know exactly what should be repaired.

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: Changed heads. Engine runs great until I put it in gear, then I have no power from transmission, shifts hard, and breaks are hard.

Hey there. Given that you performed a fair amount of engine work and have no doubts with the battery out of the car, it is possible that the throttle position sensor and engine management have lost their "pairing" values and...

Q: Intake Manifold v

The short answer is yes. They can and will find other parts that need to be replaced while in the process of another repair. This is a very common challenge when it comes to repair estimates. There are many parts...

Q: Shaking when in overdrive

Hi there. Check the fuel system and see if the fuel injector for cylinder number 2 is malfunctioning. The code P0402 means that the EGR is not functioning and the code P0174 means that Bank 2 is lean, which is...

Related articles

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...
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.