Q: Car jerking often, check engine light flashed and stayed on.

asked by on

Saab started violently jerking once in a while. Once it totally stopped and wouldn't restart so I had it towed. It wouldn't repeat the problem for the mechanic so they thought it was the fuel pump and replaced it. They also check vacuum seals and compression. Problem is happening more often and the other day I drove it about 10 miles babying it all the way home. Next day drive it a couple times around the block and it did it again. Turned it off and when I tried to restart it wouldn't. Then, five minutes later it started. Now, it's just sitting in my garage as I'm afraid it nay leave me stranded. The throttle body was recently replaced because it stuck wide open. The repairs are getting to be very costly. 🙁

My car has 110 miles.

What you are describing sounds like a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital information to the ECM which uses this to make adjustments to fuel supply to the motor. A dirty or faulty sensor can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This type of inconsistent fuel supply to the motor may cause a hesitation, loss of power, a jerking reaction, potentially a bit of black exhaust smoke and typically a strong smell of fuel when this sensor is malfunctioning. I would suggest having a professional from Your Mechanic come to your home to diagnose and inspect your vehicle.

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 jerking often, check engine light flashed and stayed on.

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: Oil sensor in car is turning on and off 2014 Volkswagon Beetle

Hi - this is not normal, and is most likely a loose connector at the temperature sensor. This sensor will be screwed into the lower oil pan, which can by nature be a fairly oily area, making good electrical connectivity...

Q: Q: Ac cuts in and out

First of all, your A/C is not likely the problem here. It is just one of the systems that is being affected by the problem. Most likely you have a bad power connection that supplies power to your dash. The...

Q: Q: Fuel pressure

Hi There, It sounds like you may have a fuel supply problem in getting the proper amount of fuel to the fuel injectors. As you know, when you turn the key to on, the fuel pump is activated and the...

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...
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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.