Skip the auto shop - Our mechanics make house calls

Q: Bang

asked by on

The second i started my car "Bang" and immediately the car accelerated all by itself. Immediately shut off and started again. This time it backfired and the engine revved again. Was afraid to put in drive. No sparks no burning.....little bit of rubber smell.

My car has 138000 miles.
My car has an automatic transmission.

Hi and thanks for contacting YourMechanic. The bang you heard is a backfire in the exhaust pipe. This can be caused by the ignition timing not firing at the right time. Check the camshaft sensor for any corrosion or it the plug has any burned connections. Also, check the conditions of the plug wires and spark plugs. Ensure that all of the plug wires are on the right cylinders according to the firing order. If you need assistance, a certified YourMechanic technician can be dispatched to your location to help diagnose and repair this issue.

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!

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: Alarm system not working correctly.

These older Buicks have a security chip in the ignition key. Often times these chips will get worn and not make a good connection or the wires on the ignition switch that read the chips will break. I would suggest...

Q: My oil gets extremely low but my oil light does not come on. What part would regulate this?

Hello, thanks for writing in. There is no sensor on your Chrysler for oil level. The "oil light" (or oil can symbol) on your instrument cluster indicates when the engine has less than roughly 5 psi of oil pressure (this...

Q: Car not starting.

There are a lot of reasons a car won't start from a dead battery to internal engine problems. An engine needs three things to run: spark, fuel and compression. A trained technician, such as one from YourMechanic, has the necessary...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...