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Backfire

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Symptoms of a Bad or Failing Carburetor
Common signs include reduced engine performance, black smoke coming from the exhaust, backfiring, overheating, or hard starting.
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A timing chain is a metal chain, as opposed to the timing belt which is made of rubber. The chain is located inside of the engine and needs to be lubricated by...
What Causes a Car to Backfire?
You’ve got an image of it in your head right now. An old car drives off jerkily from a stop sign, tires screeching as it lurches and bucks, with shotgun bangs coming from the...

Related questions

Question
Intermittently doesn't start
Hi there. There could be several reasons for your vehicle's intermittent no start issue. From the description you have given, I would not think the ECU (electronic control unit) is your vehicle's problem. Assuming the ECU is not recognizing the...
Question
Hello,
Your vehicle may have experienced a horribly clogged catalytic converter. These will usually hinder engine performance to a great degree and you may hear a blowout if the catalytic converter gets too hot and the materials inside start to melt....
Question
Rotor moves freely about 1/4 inchback and forth
Hello. If the distributor shaft has that much play, it will cause erratic ignition timing and possible misfiring. Possible causes could be the distributor shaft or drive gear being excessively worn or broken causing the movement. Continued driving with misfires/backfiring...
Question
1997 Saturn
Hello, thanks for writing in. Since the check engine light is on the best place to start is with the codes. These would help me to determine the problem. It sounds like there is a misfire problem. If that is...
Question
My car crank but does not start.
Hi there. Check the camshaft position sensor and see if it has failed. Usually the engine will start and run with a partial failed camshaft sensor, however, when the sensor has failed completely and lost communication to the computer, then...
Question
My car backfires at 50 mph.
Hi there. There is a timing problem with your engine. Check the vacuum advance to see if its advancing when the engine is at a higher rpm. Also check the spark plugs and wires for if they are burned but...
Question
My car backfires. What might be the problem?
Hi there: Backfires occur for various reasons ranging from a cracked distributor cap allowing moisture inside ignition system components to fuel system issues caused by dirty or damaged sensors, crankshaft position sensor that throws off ignition timing or other items....
Question
Engine seems like it's out of time
Hello, thanks for writing in. It is surprising to me that there are no codes stored. Nonetheless, I suspect your timing chain and gear set are worn sufficiently that the timing chain has jumped one or more teeth, and your...
Question
Car won't start but when attempting to start it makes a repetitive "pop" sound.
Hi there. What could be happening is the engine has either a large vacuum leak or the timing chain has skipped a tooth making a camshaft out of adjustment. First look all over the engine for any possible vacuum leaks,...
Question
Bang
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...
Question
Won't hold idle - 1999 Ford F-150
Hey there. This may be a sign of a dirty or failing idle air control valve or potentially an intake air leak. The idle air control valve monitors the air intake as it is mixed with fuel as it gets...
Question
Car will not start after alternator replacement?
The backfire sound usually indicates a misfire of some kind which may be related to a timing issue such as a faulty ignition coil, bad spark plug wires or a faulty crankshaft position sensor. This may also possibly be related...
Question
Nonstop backfiring
Backfiring occurs when the air fuel charge in a cylinder(s) fires at the wrong moment often when the exhaust valve is opening. There are backfires into the intake manifold, too, however. If during your work on the engine you moved...
Question
I sucked a rag into my intake, how do I clean it out without pulling the whole motor apart?
Hey there. The rag may only get as far as the intake valve and not get past it yet until the valve chews it up. You should remove the carburetor and using long mechanical fingers small enough to reach into...
Question
Backfires around 70 mph and feels like gas might cut off at low speeds
Hello - fuel starvation or failing ignition could cause the behavior you are experiencing. If you accelerate from a standing start up a long hill, does the engine behave in the same way in each gear? Ignition problems will show...
Question
The car wont go over 4000 rpms
Hi there. This sounds like the engine timing is off. Check the camshaft sensor and crankshaft sensor to see they are working. The computer has the engine in limp mode to keep the rpm's from going up. If the timing...
Question
When I'm sitting in park my truck makes a loud bang sound
Depending on the sound and the location of the sound, this may be related to a misfire/backfiring problem. Engine backfire is caused by an imbalance in the air/fuel ratio being supplied to the motor and will occur in one of...
Question
My car won't stay on
Hi there. Assuming the backfiring was taking place prior to replacing the spark plugs and spark plug wires. This would lead me to believe there is a valve train related issue. Possibly, a broken intake valve spring. This would account...
Question
Heard a loud bang when I turned on my car yesterday. 2007 Volvo XC90
Hi there - this is highly unusual behavior, and should be checked out immediately. Check for problem codes, even if the Check Engine light is not yet on. This is a misfire condition due to an over-rich condition, possibly due...
Question
Back firing
If you were working around the distributor and loosened and re-tightened it you might have set the timing wrong. Specifically, delayed or retarded timing causes backfiring as the spark occurs too late and so part of the air fuel charge...

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