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.

A: Those things are notorious for getting vacu...

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

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: Multiple cylinder misfire

Engine misfires can be caused by many different problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue or in cases, a combination of both. Spark related...

Q: Car engine sounds like vacuum cleaner.

The issue sounds like the timing belt is put on 180 degrees off making the exhaust the open when trying to start and the intake open when trying to compression. This will cause a vacuum sucking sound as the vehicle...

Q: My BMW 328is 1999 cranks but won't start 1999 BMW 328is

Sometimes you can overheat and get away with it, depending on how far the car was driven while it was too hot. If the car was driven hot until it shut off, you could have some serious engine damage. But...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.