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It makes a noise coming from under the valve cap. Any thoughts on what might be the problem?

• This generation Ford Taurus has coil on plug. The ignition coils are part of the plug wires. I have seen these go bad on a lot of make and models including the Taurus. You most likely have 1 bad one, but it will be hard to locate which one. Are there any other codes being stored besides the misfire codes? Which engine... Read More
• Ok, the simplest solution is to work cheap and easy then get deeper into the hard stuff. First, make sure your wires are in good shape. Look for any cracks, tears, etc. You can check them by pulling a wire off and laying the tip of a screw driver in and seeing if, when you crank it, it "arcs". If not, you may have a... Read More
• what kind of noise? tapping? pining? splashing? does it run smoothly or at idle does the engine jump a little? Gas mileage is a big indicator too for diagnosing. Has it changed? dropped?
• Spark plugs fouled Piston rings Bad plug wires coil getting weak need valve job overhaul engine Too many things to name here. What you need is more diagnostics to discover exactly what is wrong. It may be more than one thing.

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