Q: Car jerking and gas smell and loud noise

asked by on October 03, 2017

I'm way overdue for an oil change but whats concerning me is the loud engine noise that it makes when I start it followed by trembling and constant shaking of the vehicle. There's also a very profound smell of gasoline that comes and goes. The car feels as if it's going to blow up or shut off on me while driving and it jerks when I'm pressing the gas all the way. What could be the issue and how much would it cost me to repair including an oil change and fixing a muffler with a hole?
My car has an automatic transmission.

Fuel is leaking from gas tank Inspection $79.99 - $99.99 Get a Quote

The most important issue is the fuel odor which signifies either a leak (vapor or liquid) or engine misfiring. A leak is potentially disastrous, especially if you park in an enclosed space such as a garage where vapors can accumulate. Misfiring will cause the catalytic converter to overheat. I would start with a fuel leak diagnostic. Once the leak is resolved, the problem with the engine operation would be handled. Causes of rough operation range from fuel system to ignition system, air induction, sensors and so forth but you could even have contributing factors such as faulty motor mounts. The exhaust leak and oil change should be resolved last. One caveat though: if you do not elect to have any repairs done, it’s NEVER a good idea to drive a vehicle that has a known exhaust leak due to the potential for carbon monoxide poisoning. So, in a bit of a twist, if you are not repairing the engine (the rough operation), fixing the fuel leak and the exhaust leak become the priorities. If you are electing mobile repair, the dispatched, certified mechanic who handles the fuel leak will be well qualified to deal with all other issues (the rough operation and the exhaust leak). If you have further questions or concerns, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you to get the best possible results.

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 $65/hr

What others are asking

Overheating with new radiator

The cooling system would need to be tested to see if the combustion gasses are getting into the cooling system from a blown head gasket, or cracked head or block. This test involves a tester at the radiator to measure...

How do i turn off the auto door lock feature on my 1998 Silverado?

Hi there. With the ignition switch off grab the multi function switch and pull it towards you. Hold the switch and turn on the key to run two times. After you shut off the ignition switch, release the multi function...

Sometimes, the lower gears are slow to shift (high RPM) when starting to drive from being stopped or almost stop 2012 Ford Escape

Hi there, The "slow shift" symptoms you are experiencing may be caused by a malfunctioning transmission internal speed sensor, or by a failing throttle position sensor (which communicates with the transmission controller). Either of these could cause the symptoms you...

Can I drive over 65 mph with traction control on? Or should I turn traction control off?

Traction control helps with the stability of the vehicle in all conditions and works with the ABS system to ensure that the vehicle can stop fast and keep the vehicle in a safe condition on any roadway condition. I recommend...

Random no-start. Turning key and no response, I turn the key back off and turn it again and the car starts

Hey there. This is a sign of a faulty or failing ignition switch. When this begins to fail, this is usually a sign of the contacts inside the switch wearing out. When you put your key in the ignition and...

Hello. My heat will not come on. There is no leaks but my hose it hard as a rock. What could be the problem?

You need to feel both heater hoses coming from engine to heater core on firewall to see if they are hot? If not hot then engine thermostat is stuck open. If they are hot then you may have a bad...

I have brown goo in my radiator and there's brown on the cap

Hello there. The brown sludge you are referring to is often caused by rust or breakdown of the metallic and rubber components that comprise your cooling system. It is common for this to occur when a radiator and coolant lines...

What's the difference between the ECM and PCM?

The engine control module (ECM) controls all the engine functions to keep it running correctly monitoring all the sensors of the engine. The power train control module (PCM) will include multiple control modules in one case called a PCM. The...

Car wont start. The battery and starter have been tested are fine

This may be related to a faulty starter solenoid. The starter solenoid is located on the starter and has internal electrical contacts that transmit electricity to the starter. When this fails, it may cause a clicking sound and will not...

Related articles

The Best Used Cars to Buy If You Like to Go Off-Roading
Your Your best bet for off-roading is a 4x4 SUV. Depending on the model that pleases you most, though, you might have to shop around a bit to find a good used one. That’s simply because off-roaders typically become very...
A Buyer’s Guide to the 2012 Lexus RX
The The Lexus RX paved the way for luxury crossover utility vehicles over a decade ago, and now it continues to make waves and turn heads. An incredibly attractive vehicle, the RX (now available as either the regular RX 350...
A Buyer’s Guide to the 2012 Lexus GX 460
It It may be hard to believe, but luxury and adventure can go hand in hand – especially with the 2012 Lexus GX 460. From its luxurious interior with a variety of features to its high-quality build, off-road prowess and...