Q: Engine is spitting and sputtering at startup and wont accelerate

asked by on November 17, 2016

over the course of 6 months my elantra has had an issue at random times. It has happened about 5 times over last 6 months. It will run fine all day then randomly (on hot or cold start) will spit and sputter and run about 100-300rpms. try to give it gas and it will die. no check engine light comes on during this. After adding fuel additive to elimnate water it will run just fine. fuel tank has been at different levels each time ranging from half to tenth of a tank. add the fuel additive and it will run fine after about 3 minuets being in the system.

My car has 125000 miles.
My car has an automatic transmission.

Hi there:

When you use an additive to clear up a problem and it works, it’s typically an indication of a dirty fuel injector or throttle body issue as opposed to other mechanical component issues. An additive has cleaning chemicals that helps to remove deposits trapped inside these parts; however as the additive thins out, the clogging of carbon continues. I’d recommend having a mobile mechanic clean your throttle body and fuel injectors to start with; and see if this issue goes away, before you spend money on potentially expensive repairs.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

What Are the Drawbacks Of Lowering My Car?
While lowering a car or truck can make it look cooler, increase aerodynamics, and provide a lower center of gravity, more often than not there are downfalls to consider (https://www.yourmechanic.com/article/what-are-the-dangers-of-lowering-my-car) as well. This process can be done professionally but is...
side window came loose
In this situation the window may be able to be reattached. If the window is still in good condition it is completely possible that the part can be repaired and not need replacement. If you decide that you need some...
Not turning over
Hey there, thanks for writing in about your 2003 Hyundai Santa Fe. This kind of condition is often very confusing for a non-tech. Even though your battery cables are tight, it does not mean the connections are good. Corrosion, surface...
Continuous Clunking and thumping while driving.
Good job on the description of the noise. What you are describing is the noise that a wheel bearing makes when it is worn out. The noise will change pitch when steering left and right. The bearings for your PT...
Engine is knocking and it shakes the car while idle.
It is possible that some internal damage may have happened to the transmission due to the low fluid level. Then the transmission is not performing properly, it can affect the way that the engine runs. I would recommend having your...
When idling, car overheats and A/C blows hot air - 2001 Saturn L100
Hello. The most likely cause of the issue that your are having would be a faulty cooling fan (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-cooling-radiator-fan-motor). The cooling fans purpose is to keep the radiator and condenser for the air conditioning cool during the idling function of...
There's a hose under the top radiator hose that seems to be leaking antifreeze. What hose is that and is it an easy fix?
Hi there. Usually the hose that's directly under the top radiator hose is a return surge tank hose (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-surge-tank-hose); typically coming from the radiator overflow coolant reservoir. Since winter is coming around soon, the best way to diagnose a coolant...
Car overheats aftr 10 mins of idle, but heater blows cold air. Trapped air noises? 2003 Audi A4
Hello - you have at least one cooling system problem (https://www.yourmechanic.com/question/my-car-says-it-s-over-heating-by-colton) that could be causing all of the symptoms, or more than one problem. The cooling system was not properly bled, and still big air pockets. This will cause overheating...
My boy accidentally hooked battery cables up wrong on his truck, and now it's got white smoke that smell like gas coming out.
When hooking up the battery cables backwards, the ground became the hot and the hot became the ground. Most likely the computer (ECM) could have failed and the fuel pump may have burned up. I recommend checking all of the...

Related articles

A Buyer’s Guide to the 2012 Hyundai Veracruz
The The sleek design, luxurious interior and smooth finish of the 2012 Hyundai Veracruz belies a full size SUV from a much higher price range. When you add expert handling and acceptable performance, you have a vehicle that is well-worth...
The Best Used Cars to Buy If You Just Got Your License
If If you are a new driver, congratulations on getting your license. Now, you need to think about what type of vehicle to buy. Ideally, you’ll choose a used car that isn’t overly expensive, and is reliable and safe while...
The Best Used Cars to Buy If Safety is #1
Maybe Maybe you’re a parent buying the first car for your teenager, or perhaps you’re a new parent and the safety of your little one is of the utmost importance. Or perhaps you're a safety-minded individual looking to make a...