Q: Car violently shakes at 30+ mph after cold start

asked by on

My car started violently shaking at low speeds 30-40 mph. It shakes REALLY bad. It feels like a tire is about to fall off or the engine is throwing itself around in the compartment. This only happens in the morning on my way to work but not on my way home. Also if I accelerate really quick it doesnt shake. I checked my shocks, axles and steering components for issues. Nothing looks bad. Havent checked my brakes or rotors though but thats my next thing. This started after I ran smoke through my brake master cylinder vacuum line trying to find a vacuum leak. I drove it after that and it was fine, then a couple hours later I started drive it would shake. It still shakes when Im braking. I have no reason to suspect my tranni because gear changes dont stop the shaking but I dont know. It has 2 bad engine mounts but those have been bad for 2 years and never an issue.

Any idea what the problem could be? What I can try to get it to stop? Should I stop driving it until what it is gets fixed?

My car has 170000 miles.
My car has an automatic transmission.

Hi Chris. Thanks for writing in tonight. The biggest problem with bad motor mounts is that when they fail, they tend to fail rapidly; so that might be what has happened to your Mitsubishi. However, it’s also possible (although less likely) that the wheel bearings are the source of your problem, or as you tested for earlier, you’ve got a pretty aggressive vacuum leak. It is also possible that an electrical connection to an ignition system or fuel injector might be loose, which can also cause an aggressive vibration. To be honest, there are about a dozen more possibilities, which is why it’s always best to have a professional mechanic come to your location and complete an onsite inspection as soon as possible. I would strongly recommend not continuing to drive the vehicle, as this type of problem can morph into more severe 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
  1. Home
  2. Questions
  3. Car violently shakes at 30+ mph after cold start

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: Engine light flashing.

A flashing check engine light generally means there is a misfire dumping raw fuel into the exhaust system, usually caused by a consistent misfire, if the car is driven in that condition for long enough catalytic converter damage is likely....

Q: how many valve lifters do i have in my vehicle?

Most vehicles use regular fuel. If your vehicle says premium fuel only on fuel gauge then you will need to add premium fuel to run the engine properly. As far as lifters you have cam followers if it is an...

Q: Q: Transmission pops out of gear

This may suggest the transmission synchros may be wearing out. Your transmission has small gear synchronizer rings that help to move the transmission in and out of the various gears. When these begin to wear out, you may notice it...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...