Q: Car shakes when stopped; hesitates when accelerating - 1998 BMW 332is

asked by on September 03, 2016

When my car is stopped, it shakes. Also, the car hesitates when I accelerate and I have to floor the accelerator pedal in order to speed up. When I was performing a tuneup on the spark plugs, there was some oil around the thread and there was a dark/burnt look on the tips. So I replaced the spark plugs, gasket, valve cover gasket, and seal. The shaking is slightly better, but not much, so all of that actually did not solve the problem. What is your advice for what will fix the shaking and hesitation problems?

You don’t mention the Check Engine Light being on, but if so, check trouble codes before any other diagnostic activity - usually saves time! Good call on your initial repair - oil in the spark plug well can short the spark plug, causing a "miss" from that cylinder. It’s possible you have a bad ignition coil (or more), or some other problem like a blown head gasket causing one or more cylinders to misfire. A professional mechanic, like a certified technician from YourMechanic, can check for good spark, good compression, and proper fuel injection on each cylinder to isolate the problem and make repairs.

Was this answer helpful?
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

I torqued the axle nut on my 1996 BMW 328i to the spec of an M3 and want to know if I may have damaged the axle in some way.

Hi Marvin. Thanks for contacting us today. The main cause of over-torquing is using an impact or air wrench. However, the majority of damage occurs when the torqued component is in use, develops heat then cools. In your situation, catching...

Harsh shift - 2004 Toyota Camry

Hi there. This may be a sign of a faulty transmission control solenoid. Modern automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission solenoid, which directs transmission...

What would cause the temperature gauge to go cold to hot then back to cold

The engine temperature is regulated by the thermostat opening and closing to maintain the engine temperature. The cooling fan clutch also will maintain the engine temperature to keep a controlled air flow across the radiator to maintain the engine temperature....

Related articles

What Are the Best Spark Plugs for Normal Use?
Spark Spark plugs are essential components of your ignition system. They’re responsible for supplying the spark that ignites fuel and starts the combustion process. However, not all spark plugs are created equal. You’ll find “normal” plugs on the market, but...
A Buyer’s Guide to the 2012 BMW 7-Series
When When power, performance and luxury are at the top of your list, the 2012 BMW 7-Series is sure to be a perfect fit. From the stylish design to two length options for enhanced comfort, three available engines and two...
A Guide to Motor Oil Additives
Motor oil contains various additives to make it perform better. Conventional and synthetic oils both contain additives which help prevent engine wear.