Q: Car shaking and misfiring

asked by on January 29, 2016

My car is shaking. The mechanic I took it to said it was misfiring. I had the spark plugs changed and now it is driving worse than it was before.

Hi. The first thing to do is check the codes stored in the engine computer. If the engine is indeed misfiring, codes will be stored. The source of the misfire will need to be identified, possible faults include a failing fuel injector, ignition coil, engine computer, etc. However, there are quite a few TSB’s (Technical Service Bulletins) that address a whole host of power/drivability issues stating updated software for both the engine computer and transmission computer. Incorrect fuel maps before and after turbo kicks in or faulty torque converter lockup logic maps may be the cause of your concerns. You may want to enlist the help of a mechanic, like one from YourMechanic, to read out faults and diagnose the misfiring issue your vehicle is encountering.

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

Where are all of the sensors located in this car?

Hello: Sorry, but we can't supply this information for you. First, we don't know what model of Isuzu you have, and second; we don't know what type of sensors you're referring to. Most modern cars have well over 20 of...

My brakes stutter sometimes - 2007 Chevrolet Silverado 1500 Classic

As you may know, your car is equipped with wheel speed sensors at each of the four wheels. These monitor wheel speed while relaying this information constantly to the ABS and traction control system, which are controlled by the car's...

Car idles and multiple trouble codes are triggered

Hi there. If this vehicle is having an idle concern, I have to ask if you may be having a stumble or stall issue when coming to a stop. If so, your vehicle may be covered under a special...

Related articles

How Often Should Spark Plugs Be Replaced?
While your engine runs on gasoline, it also requires electricity. It’s needed to operate most of your accessories, but is also required to...
Symptoms of a Bad or Failing Ignition Coil
Common signs include the Check Engine Light coming on, engine misfiring, rough idle, a reduction in power, and the car not starting.
Symptoms of a Bad or Failing Ball Joint (Front)
Common signs include clunking noises and excessive vibration from the front, and you may start steering to the right or left unintentionally.