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A backfire is when the ignition of fuel doesn't take place in the ignition/combustion chamber, it(a backfire) can take place in the intake or exhaust. It can be caused by a fuel to air ratio not being correct, also if the timing of the spark is not just right that could cause it to back fire. It could be running lean with not enough fuel and too much air, or could have too much fuel and not enough air. It could be because the intake valves are not shut when the combustion takes place, therefore the combustion would take place in the wrong spot. The most likely cause are from: 1. Incorrect timing, the timing issue could be caused by bad wiring/ or bad ignition. 2. Incorrect fuel to air ratio, bad fuel filter, low fuel pressure-caused by weak fuel pump.
Wiki User
∙ 14y ago
Wiki User
∙ 17y agoThere are a couple things to check. If it has a distributor cap, that could be damaged and/or worn. Check the inside of the distributor cap for black carbon traces, cracks or other signs of damage. Check the compression level. If the compression is low, you may have a slipped timing belt/chain, whichever that engine uses. If neither of those seem to be the problem, it could be as simple as an ignition timing problem.
Wiki User
∙ 19y agoCheck all vacuum hoses and plug wires. If none, have the compression checked.
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boi bangs
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