Skip the auto shop - Our mechanics make house calls

Q: Raw fuel smell and jerks at 19 mph after acceleration

asked by on

kept getting cylinder misfires aND codes for cat convertor so I replaced all the coils spark plugs and cat during that time my car started to jerk everytI me I hit around 19 mph usually after acceleration from a stop then it started smoking from the tailpipe and jerking really bad took to the dealer they said misfire in cylinder 3 cleaned the wetness on the spArk plug moved the coils around . Car still jerks at 19 mph aND car smell raw fuel occasionally. Took it back they said threw a code for o2 sensor behind left cat , replaced it but still having same issue.

My car has 169000 miles.
My car has an automatic transmission.

Hello, It sounds like you may have 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?

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Raw fuel smell and jerks at 19 mph after acceleration

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: How do I rewire under the dash pad? Many of the wires are just there disconnected and some are damaged.

Hello. If you were to purchase an entirely new harness that is made for your vehicle, it should a simple plug and play. I would not recommend tearing everything out. But instead, if I were to do it I would...

Q: Evap system

Hi There, As you know code P0449 relates to the vent valve or solenoid malfunctioning. It sounds like you may have an evaporative emissions system leak. Your car has a small purge valve with a purge solenoid in the Evaporative...

Q: What is the real problem with my car?

This is often a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission...

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...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.