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What causes a backfire - Cars & Trucks

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Gases in the engine exploding at the wrong time, Ignition timing set wrong, misfire putting un-burnt fuel into the exhaust system, then ignited by hot gases. Most common fault, is an ignition cross fire, where a spark plug is fired at the wrong time, happened mostly with high tension plug leads breaking down in damp conditions and shorting across each other, causing the plug to ignite gases in the cylinder at the wrong time when a engine valve is open.

Posted on Dec 31, 2013

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Posted on Jan 02, 2017

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Why does my trx200sx backfire when I let off throttle it just started this


Dennis, Maybe try changing your plugs, unburnt fuel may be getting in exhaust because of weak plug.. Read the following links, very informative in telling causes of and some suggested fixes on backfiring. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
http://www.rcramer.com/shop/backfire.html

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What causes backfires in 2000 catera


timing issue. a car backfires when fuel is not burnt in the combustion chamber, and end up in the exhaust system. your car could very well just need a tune up.

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I have a390 ford engine that back fires while idling it has a breaker point ignition what could be wrong


Check this video for idle speed adjustment. Backfiring can be caused by incorrect mixing in the carburettor or bad timing settings.


Check this link for backfire issues:

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What would cause my 1996 Chevrolet Silverado 1500 with a 350 Vortec engine to backfire on occassion when I crank it?


The distributors on these GM trucks should be replaced at least once a year. Any check engine light on? The crank sensor can cause it to backfire as well.

Jun 23, 2014 | 1996 Oldsmobile Aurora

1 Answer

Truck is backfiring and missfiring.


Have the misfire diagnosed and the backfiring will be fixed also. The backfiring is caused by the "over-rich" fuel mixture in the exhaust stream and is igniting within the exhaust. Fix the misfire (which will cause the rich condition) and the backfire will be gone.

Mar 24, 2014 | 1994 GMC Sierra

1 Answer

Hi I'm new to this site , I have been asked to close Q I have asked already but don't know how on my iPhone to close then please help


There are two kinds of backfires, one is produced from the engine air intake and the other is produced from the tail pipe of the exhaust system. The cause for a backfire condition can vary depending on the malfunction of a particular system. Some backfires can be extreme enough to cause damage to related components. Anytime a backfire is observed immediately diagnose and repair as needed. If the engine is running rough it can produce a backfire. A backfire occurs when there is an imbalance in the air to fuel ratio required for your vehicle to operate properly. If the fuel mixture is too lean (not enough fuel) you may have a backfire in the intake manifold gasket, or too rich (too much fuel) you may get a backfire out of the exhaust system. It is important to observe the location of the backfire.

Oct 10, 2012 | Cars & Trucks

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Have a 1991 s10 blazer have changed plugs, distubutor cap, magmetic pickup coll, an all the parts in it have been checked, new timing chain an gears an it is still missing an backfiring could the water...


no...water pumps do not cause backfires. faulty water pumps causes overheating.

backfiring is caused by incorrect firing order. the connection of your high tension wires are wrong

Aug 12, 2011 | 1991 Chevrolet S-10 Blazer

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WHAT WOULD THE PROBLEM BE IF YOUR CAR IS BACKFIRING AND MISSING?


Back fire can be caused by different faults.First is to much fuel because of worn carburetter, or wrong adjusments on carburetter. choke sticking will cause backfire. timing be out of adjustment will cause backfire exhaust leak can cause backfire. bad spark plugs, or plug leads , distributer cap worn of cracked will cause backfire as for fuel in muffler, if it combusted in muffler , the muffler would split open it is not that.

Jul 30, 2010 | 1994 Ford Mustang

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Backfiring on acceleration of a 2002 GMC with 6.0 Engine


Backfires are usually caused by a lack of fuel...change the fuel filter. Also very old spark plugs (or plugs gapped to wide ) will cause this problem.

Jun 13, 2009 | 2002 Chevrolet Silverado

1 Answer

Backfiring


First define backfire - I know backfiring as a loud bang from the exhaust caused by unburned fuel entering the exhaust and combusting there. Some people refer to a spit-back through the intake as a backfire, the latter being caused usually by a slow burning lean mixture still burning when the intake valve opens. This mostly occurs when the throttle is opened allowing a rush of air without the addition of extra fuel but can also be caused by a poor or delayed spark.

Combustion in the exhaust is rare these days.

Oct 22, 2017 | 1995 Chevrolet S-10 CA Edition

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