Skip the auto shop - Our mechanics make house calls

Q: Car shakes violently and 'check engine' flashes

asked by on

Earlier, I was driving my car and it started shaking violently - the whole car shook. The check engine warning light flashed on, so I went to an auto shop and plugged in the computer. It read: “Misfiring on #3.” After that I replaced all spark plugs, wires, and even the valve cover. No help at all to solve the problem! My car is still running, but it roughly idles and there’s no power when I accelerate. However... ‘everything gets okay’ when I drive past 25mph. What is your assessment of all this and how do I solve the problem?

A: Since you are only getting a misfire on cyl...

Since you are only getting a misfire on cylinder number 3 specifically, this informs me that the cylinder ignition is not the problem. Since the engine has a coil pack that powers two cylinders at the same time and if #3 was misfiring then most likely the cylinder number 1 would have a miss as well.

From what I can tell, you have a fuel injector that is clogged or not working. Another possibility is a leak in a vacuum for the cylinder.

Since you’ve mentioned that the problem goes away after 25 MPH then this tells me that the EGR is most likely stuck open. This would cause the cylinder to misfire at low speeds and would not effect the engine on higher engine speeds. Have the EGR checked to verify if it’s stuck open.

I’d recommend getting some help from a certified mechanic for these checks. They will be able to diagnose what’s causing your car to shake firsthand and 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・Fair and transparent pricing

Get a quote

What others are asking

Q: Missing fuse box cover.

Hi there. When it comes to the torque on the spark plugs, most spark plugs are tightened to the stopping point and then an 1/8 turn more. If you need the specs of your spark plug, then measure the treads...

Q: Engine noise at idling, Check Engine Light on

Hello. It is common for these cars to have problems with the camshaft gears making noise and causing the Engine Light to come on. If the problem persists, then damage to the motor is possible. It would be a good...

Q: Several warning lights came on and the car is overheated, making a weird noise, and giving off a bad smell after being jump started.

There are a few possibilities with the symptoms you are having. The most common with what you have described is you may have attached the jumper cables incorrectly. This could cause a number of issues including the symptoms you are...

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...