Q: Backfires on start up

asked by on December 04, 2016

Runs rough backfires through carborater on cranking

My car has an automatic transmission.

Engine is backfiring Inspection $94.99 - $114.99 Get a Quote

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.

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

Doors not unlocking when I use key fob
Hi. I'm going to assume they open when using the door lock switch. First of all, pressing the fob once only unlocks the driver's door. The fob must be pressed a second time within 5 seconds to unlock the rear...
Car running and idling rough
Hello. It is possible that your vehicle would need a complete tune up and/or a Check Engine Light inspection. I would have a certified mechanic scan your vehicle's computer for codes to diagnose your Check Engine Light (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection). These codes...
broken exhaust manifold bolt.
If you haven't done this before, I highly recommend taking it to someone who has experience with broken bolt removal. This is a process that requires experience or the results can be very bad. When a newer technician is taught...
Fuse box modification.
Hi there - from your description, it sounds like there is no electrical socket in the fuse block in this position. Manufacturers used to include wiring for all possible options when the vehicle was built - using a single wiring...
About three weeks ago while driving in a storm my car went into limp mode and my check engine light came on 2006 Infiniti M35
Hi there. If those codes only came up at that time and they were cleared and have not come back then you had water intrusion into the connections on the transmission causing this. I would usually clean the connections and...
My back rear tire is leaning inward at the top and wheel is getting some tear on the inside of the tire
If you have one of the rear tires leaning in then you have damaged the upper control arm or spindle is bent. Have the vehicle suspension checked for damaged components and have alignment done.
P0121 02 vw beetle
You will need to have codes cleared and then the system tested again to see if it runs good or codes return. If the problem is still there then monitor data for the AAP1 and AAP2 on scanner to see...
Was in a rear-end collision that affected my brakes. Mechanic says master cylinder is the issue. Could this be do to the wreck
To determine if crash forces led to master cylinder failure you would have to determine exactly "what" failed within the master cylinder. If the master cylinder bore is scored or worn, for example, thus causing significant output pressure loss, that...
Can putting a EverStart Marine Battery, Group 24MS - 1000 CA in my van damage it? If so, how?
The battery you installed is a 12 volt battery and although the cranking amps rating of the battery you have applies to a higher temperature (marine environments are typically relatively warm environments) at 1,000 MCA (marine cranking amps), that is...

Related articles

A Buyer's Guide to the 2012 Mercedes-Benz GLK
If If you’re in the market for a compact SUV, it’s tough to think of a better option than the 2012 Mercedes-Benz GLK. In case the car manufacturer’s name doesn’t carry enough weight to convince you, consider some of the...
A Buyer's Guide to the 2012 Mercedes-Benz GL350 BlueTec
If If you love a diesel engine in your SUV, but still want to ride around in luxury, your perfect vehicle may very well be the 2012 Mercedes-Benz GL350 BlueTec. Key Features The most important feature worth noting is the...
A Buyer’s Guide to the 2012 Mercedes-Benz SLS AMG
Powerful, Powerful, aggressive and streamlined, the 2012 Mercedes-Benz SLS AMG is a precision-crafted supercar. It was offered originally as a coupe, but this year saw the addition of a roadster body style. Key Features From the 7-speed dual clutch to...