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Engine Misfire

Online Auto Repair Manuals - Engine Misfire

ALLData: Do It Yourself Auto Repair Manuals


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What happens when the engine misfires?

When an engine misfires it produces poor engine performance and fuel economy, and unusually releases high levels of hydrocarbons into the environment. The cause of an engine misfire may be difficult to diagnose, and intermittent misfires are particularly challenging.

What should I do if the engine misfires?

Engine misfires are caused by spark plugs not working, imbalance of the air and fuel mixture, or a loss of compression. Causes include corroded or worn spark plugs or wiring, a leaky EGR valve, or a blown head gasket. Isolating the misfire is the first step in figuring out the problem, and may take a combination of disconnecting spark plugs and performing power balance tests.

What are my options?

Depending on the complexity of the problem, a skilled owner may be able to identify and/or fix the problem. The vehicle may need to be taken to an auto repair shop for some diagnostic tests. Automotive websites advertise repair services and/or sell parts. Other vendors offer DIY diagnostic instructions, while others sell service manuals or how-to books.