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Backfires in intake manifold - Cars & Trucks

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It could be misfire are you getting a loud noishttps://www.youtube.com/watch?v=SZPiD7nv9Bwe from engine and there can be many things related to the misfire
1) Short Coil
2) Improper spark plug gap
3) Carbon deposit on the spark plug
4) Wiring issue ( coupler )
If you are sure it is related to coil then check the wiring voltage with a multimeter and make sure than wiring it ok. There is simple method to test which ignition coil i not working , I am sharing a video for that. Once you are sure which one is not working then replace it.

Good Luck

Posted on Apr 03, 2015

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Sounds like a timing issue.

Posted on Apr 03, 2015

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1990 2.9 bronco 2 ..bucking backfiring, and wont idle up..


It sounds like a major vacuum leak into the intake manifold. Check all of the hoses attached to the intake and throttle body for leaks including the power brake booster hose.

Feb 10, 2015 | Cars & Trucks

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I have a 91rs automaic and when i drive it some times it backfirers why


Most of the time when an engine backfires it is due to the timing being off or there is a severe vacuum leak at the intake manifold. You can locate the leak (vacuum) by taking a propane torch (DO NOT LIGHT!!) Open torch valve (1/4 turn) And slowly take torch around intake manifold. Wherever torch is and causes increase in R P M's There is where your leak is. Hope this helps

Nov 13, 2013 | Cars & Trucks

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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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What happens if there is air in the gasline?


Most likely cause is poor ignition timing. However, important to know whether backfire is through intake or exhaust manifold. Could be something as sinister as worn/burned valve. Probably wise to get compression pressures checked and ensure all manifolds tight and with no leaking gaskets, but all this AFTER getting ignition timing checked. Good luck!

Jun 07, 2012 | Chevrolet Cavalier Cars & Trucks

2 Answers

Backfire through carburater


check the compression,and the firing order.

Sep 29, 2010 | Ford F-150 Cars & Trucks

1 Answer

1999 chevy cav 2.2 backfiring thur intake


here are a few things to check, egr system not working properly, vacuum leak at intake or manifold, damaged valve springs or sticking valves. all of the above will cause a backfire in intake.

Jan 12, 2010 | 1999 Chevrolet Cavalier

1 Answer

What causes our 1986 chevy motorhome to back fire through the carburator? This occurs when you first take off, it stops after awhile when warmed up. Carburator has been rebuilt, new plugs, wires and cap....


Backfire in an automobile engine typically results from various malfunctions related to the air fuel ratio. Backfiring can occur in carburetor engines that are running lean where the air-fuel mixture has insufficient fuel and whenever the timing is too advanced. As the engine runs leaner or if there is less time for the fuel to burn in the combustion chamber, there is a tendency for incomplete combustion. The condition that causes this is a misfire. The result of a misfire or incomplete combustion is that unburned fuel or flammable hydrocarbons are delivered to the exhaust manifold where it may ignite unpredictably.


When starting an engine, timing that is too advanced will fire the spark plug before the intake valve is closed. The flame front will travel back in to the intake manifold, igniting all of that air and fuel as well. The resulting explosion then travels out of the carburetor and air cleaner. A common air filter will allow the gases to escape, but will block the flame front. On many small marine engines, no air filter is used, but a screen is placed over the intake of the carburetor as a flame arrest to prevent these flames from escaping the intake, and potentially igniting fuel, or fuel vapors in the enclosed sump or bilge of the boat and causing a fire or explosion. Improperly adjusted carburetors that create a lean condition during acceleration can cause the air fuel mixture to burn so slowly, that combustion is still taking place during the exhaust stroke, and even when the intake valve opens. The flame front can then travel up the intake and cause a backfire. In this situation it is conceivable that there is a backfire occurring in the intake manifold and exhaust manifold simultaneously.

Good luck and hope this helps, check the carburetor settings to make sure it's not running too lean and the timing . Keep me posted, be glad to help you get your RV running 100% again.

Jul 14, 2009 | 1995 Chevrolet C/K 3500

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Backfires in manifold on motor on acceleration. runs ok low speeds


Spark plug wires. If you take it in a garage or wait till it's dark, and have somebody brake torque it while you watch, you'll see spark jumping. But don't get run over! Do it in reverse. Or just change the wires.

Jun 01, 2009 | 1997 Dodge Caravan

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