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Q: Spark plugs

asked by on

how can I check whether plugs are ok_

My car has 2000 miles.
My car has a manual transmission.

Hi There, There are a number of things to look for when checking your spark plugs. Fuel-fouled plugs may have a shiny coating on the tip and side electrode, which may indicate a too-rich fuel mixture, ignition problems or a plug heat range that’s set too low. First, check to make sure your spark plugs have a heat range that is compatible with your engine (especially if you’ve made performance modifications). This information is available in your vehicle owner’s manual. To resolve the too-rich fuel mixture, have the fuel injection adjusted to correct the air/fuel mix. Detonation damage is another condition that may cause problems with your spark plugs. This plug condition indicates that your engine timing is off and you probably need a tune-up. Another possibility is that the gasoline you’re using does not have a high enough octane rating. If your plug tip and side electrode are blackened, they have been running with too much fuel (or possibly too cool from a stuck-open thermostat). Other sources of the problem may include bad wiring or leaking injectors; in some cases the vehicle has been driven at too slow a speed for extended periods of time. In the case of a mechanical failure, this may indicate a plug that has been damaged due to contact with a piston.

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