Skip the auto shop - Our mechanics make house calls

Q: Misfiring

asked by on

I am driving bmw 323i E90 2006 with 196000km. When I'm starting the engine sometimes idling is so bad you find the whole car vibrating then when you put it on a drive gear it does move but not smoothly you can hear the sound even from the outside and the smell of petrol as well too sometimes when you come to a stop engine goes off or if it's on you find the Rev counting going up and down just above 1 but sometimes it can go smoothly as if nothing is wrong. So my question is what causes it to do that? And how can I solve the problem

A: This is often times related to what is call...

This is often times related to what is called an idle air control valve which controls the air/fuel mixture at idle speed. When this is not working properly, this can cause the car to run either too rich (too much fuel - maybe causing the fuel smell) or too lean which means not enough fuel.

Either scenario can cause the car to run very rough like you have noticed. I would recommend having a certified expert, such as one from YourMechanic, take a look at the car to diagnose the misfire firsthand and help you fix it accordingly.

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・Save up to 30%

Get a quote

What others are asking

Q: Car stalling and giving code P1131.

Hello. P1131 indicates an issue with one of your oxygen sensors. When this code appears it is because the oxygen sensor that is closest to the engine is not switching or varying voltage. More than likely this sensor will need...

Q: Car moving from side-to-side when driving

Hello, I'm not quite sure what you mean that it moves side to side. Being that it is affecting the drivability of the vehicle, it should be inspected and repaired sooner that later. You will probably need the aid of...

Q: The car is misfiring.

Hi, thanks for writing in. There are many things that could cause a misfire, such as faulty spark plugs, a bad coil pack, bad injectors, a faulty crank position sensor or something else. I would recommend having an expert from...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.