Skip the auto shop - Our mechanics make house calls

Q: Stalling and misfiring at idle on a 1999 BMW Z3

asked by on

I have a BMW Z3, 1999. At idle, it sputters a bit and feels like it's going to stall but just as it bangs on, it first feels like a misfire. The car drives fine when it's warm, and idles under 1,000 RPM.

Those things are notorious for getting vacuum leaks on them because the tops of the engines are all made out of plastic--including the intake system. Especially on the driver’s side, there are all kinds of plastic piping. You’d want to look for the vacuum leaks first and if you’ve got a vacuum leak it’s going to do all that stuff. Now, if you don’t have a vacuum leak, those are also notorious for having very bad MAF sensors. Mass air flow sensors--check that with a scan tool too. But, it’s often vacuum leaks on that car. It’s really typical when it gets that old. I would have a certified mechanic, such as one from YourMechanic, inspect your vehicle’s misfiring and stalling issue so that 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: My car shakes badly mostly between 40-70 mph and gets better when I left off gas.. Help plz

Hello, thank you for writing in. The most common cause of shaking is a misfire. Misfiring is a general term for any kind of issue with the combustion of the air fuel mixture in the combustion chambers. Start by having...

Q: Two hoses that lead nowhere

I've spent many an hour scratching my head over just this kind of problem. One of the hazards of working on older cars is having hoses and fittings break off while you're trying to get to something else. I know...

Q: Truck making thunking noise and not starting.

The most common problem for the engine that will not crank if the battery is good is the starter. I recommend that starter is checked for proper power getting to it from the battery and the ignition switch before replacing...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...