Q: Backfires on start up

asked by on

Runs rough backfires through carborater on cranking

My car has an automatic transmission.

Backfiring can be caused by a number of faults. If the ignition timing is incorrect either by the distributor being out of alignment or a jumped timing chain, backfires can occur. Also, if ignition wires are crossed / incorrect firing order, backfires can occur. Also, too much or too little fuel due to faulty fuel injectors or incorrect fuel mixture can cause a backfiring condition as can faulty spark plugs. Other mechanical issues such as burned exhaust valves in one or more cylinders can cause backfiring.

Since any of multiple components can be the cause, have a certified technician look into the backfiring to isolate the exact cause.

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
  1. Home
  2. Questions
  3. Backfires on start up

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: Car not going even with gas pedal all the way down

If by "won't go" you mean the car doesn't have any acceleration, then the vehicle could be misfiring to a point of failure. If multiple cylinders are misfiring all at the same motor won't expel enough power to efficiently move...

Q: Your mechanic come and replace oil for my BMW X5, but the car said the oil is below minimal, how to do that?

Hi Tony. Thanks for contacting us today. Sometimes directly after the oil is changed, the oil warning light will illuminate. If it does not clear up within the next day or so, then I would recommend adding one quart of...

Q: Whistling noise when shifting gears

Hello there, thank you for asking about your 1989 Buick Reatta. Your gas mileage will vary depending on what kind of driving you're doing. It's possible the first week you did mostly highway driving, while the second week you stayed...

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.