Q: Car hesitating when accelerating.

asked by on January 08, 2016

When accelerating from a stop, the car hesitates even with the gas pedal to the floor. Eventually, it runs fine, but does this every time I accelerate from a slow to fast speed. No warning lights are coming on.

There are many sensors on a car that the computer relies to tell it what is happening. Things like engine temperature, air density, elevation above sea level, ambient temperature, etc., are all readings that your cars computer uses to determine how much fuel to inject at specific times. A faulty sensor that is sending the wrong information will cause things to go out of balance. This can translate into a hesitation, a stumble, bad gas mileage, loss of power, etc. Even though there is no warning lights, the cars computer can still have what are known as "soft" or "pending codes" stored. These are codes that do not turn on a light but are still stored in memory. Also Freeze Frame data records may be stored in the computers memory as well. These Freeze Frames are recordings that your cars computer takes of what is happening when your vehicle is acting up. They contain vital information that a technician can use to help diagnose the issue. A technician should be able to scan, extract, and interpret that information for a proper diagnosis.

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

Transmission leaked all of the fluid out

It is possible that a cooler line has sprung a leak for your transmission. The only other explanation for rapid fluid loss in a transmission is that the oil pan has been punctured by some road debris. I would recommend...

Battery keeps dying out after the car sits for two days

Hey there. You may have excess current being drawn somewhere in a circuit while the car is not running. A mechanic would use an ammeter to probe various circuits to isolate the problem. As a temporary measure you could install...

Changing my water pump What sequence should I remove the belts in and how would I go about that?

If you're going to replace the belts, which is what I recommend, you just start with the outermost belt and work your way back. Off the top of my head I believe the water pump belt is the last one...

Related articles

Top 10 Factors to Consider When Buying a Luxury Car
The The idea of owning a luxury car is appealing. The glossy paint, swoopy lines, and prestigious badges speak of the owner’s success in life, while the interior opulence offers scented leather surfaces, high-tech telematic devices, and all the creature-comfort...
5 Comfortable Sports Cars Your Parents Won't Complain About Riding In
The most comfortable sports cars combine high performance with a smooth ride. Options include the Alpina B6, Audi S8 Plus, and Mercedes-AMG S65.
A Buyer’s Guide to the 2012 Mercedes-Benz SLK
It’s It’s not a sedan and it’s not quite a sports car, but chances are that brand-loyal fans desiring that luxury-class hard-top convertible with some oomph under the hood won’t care. The SLK roadster boasts three attractive engine options, and...