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A spark plug arrangement for an exhaust treatment device is disclosed. The spark plug arrangement may have a body, and a center electrode extending from an end of the body. The spark plug arrangement may further have a mounting member with a bore configured to receive the body, and a grounded electr

A spark plug arrangement for an exhaust treatment device is disclosed. The spark plug arrangement may have a body, and a center electrode extending from an end of the body. The spark plug arrangement may further have a mounting member with a bore configured to receive the body, and a grounded electrode extending proximal the center electrode.

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What is claimed is: 1. A spark plug for use with a mounting member having a grounded electrode, the spark plug comprising: a body configured for insertion into the mounting member; and only a positive electrode configured to mate with the grounded electrode, wherein the positive electrode extends f

What is claimed is: 1. A spark plug for use with a mounting member having a grounded electrode, the spark plug comprising: a body configured for insertion into the mounting member; and only a positive electrode configured to mate with the grounded electrode, wherein the positive electrode extends from the body past the grounded electrode. 2. The spark plug of claim 1, wherein the positive electrode extends from and is axially aligned with the body. 3. The spark plug of claim 2, further including a terminal electrically connected to the positive electrode and extending from the body opposite the positive electrode. 4. The spark plug of claim 1, wherein the positive electrode is electrically insulated from the body. 5. A spark plug arrangement, comprising: a body; a center electrode extending from an end of the body; a mounting member including a bore configured to receive the body; and a grounded electrode connected to the mounting member, and having a proximal end portion and a distal end portion, the distal end portion including a distal tip extending toward the center electrode. 6. The spark plug arrangement of claim 5, wherein the body is threadingly received within the bore. 7. The spark plug arrangement of claim 5, wherein the center electrode is insulated from the mounting member. 8. The spark plug arrangement of claim 5, further including a plate press-fit into an open end of the mounting member to close off a cavity within the mounting member, wherein the grounded electrode is integral with the plate. 9. The spark plug arrangement of claim 8, wherein the plate is a swirler plate configured to mix fuel and air. 10. The spark plug arrangement of claim 9, wherein the center electrode extends through the swirler plate from a first surface past a second opposing surface. 11. The spark plug arrangement of claim 10, wherein the grounded electrode extends from the second surface of the swirler plate. 12. The spark plug arrangement of claim 8, wherein the first mounting element includes a purge gas line in communication with the bore. 13. The spark plug arrangement of claim 8, wherein: the center electrode has a base end fixed to the body, a free tip end, and a side portion extending from the base end to the free tip end; and the distal tip of the grounded electrode is angled toward the side portion of the center electrode and terminates at a radial location between the proximal end portion of the grounded electrode and a base end of the center electrode. 14. The spark plug arrangement of claim 5, wherein the spark plug arrangement is associated with a fuel injector and the grounded electrode is always maintained in the same orientation relative to the fuel injector when the spark plug arrangement is assembled. 15. The spark plug arrangement of claim 14, wherein the center electrode is always maintained in position between the grounded electrode and the fuel injector when the spark plug arrangement is assembled. 16. An exhaust treatment device, comprising: a housing configured to receive a flow of exhaust and having an opening; a mounting member configured to close off the opening and including: a first bore; and a second bore; a grounded electrode extending from a periphery of the second bore; a fuel injector disposed within the first bore to selectively inject fuel into the flow of exhaust; and a spark plug configured to ignite the injected fuel, the spark plug including: a body disposed within the second bore; a terminal extending from a first end of the body; and a center electrode connected to the terminal and extending from an opposing second end of the body. 17. The exhaust treatment device of claim 16, further including a swirler plate press-fit into the mounting member, wherein the grounded electrode is integral with the swirler plate. 18. The exhaust treatment device of claim 17, wherein the swirler plate is configured to mix the injected fuel with air. 19. The exhaust treatment device of claim 17, wherein: the grounded electrode has a base end at the swirler plate, and a free tip end; the center electrode has a base end fixed to the body, a free tip end, and a side portion extending from the base end to the free tip end; and the free tip end of the grounded electrode is angled toward the side portion of the center electrode and terminates at a radial location between the base end of the grounded electrode and a base end of the center electrode. 20. The exhaust treatment device of claim 16, wherein the mounting member includes a purge gas line in communication with the second bore. 21. The exhaust treatment device of claim 16, wherein: the grounded electrode is always maintained in the same orientation relative to the fuel injector when the spark plug is assembled to the mounting member; and the center electrode is always maintained in position between the grounded electrode and the fuel injector when the spark plug is assembled to the mounting member. 22. A method of igniting fuel, comprising: injecting fuel into a chamber; directing air into the chamber; grounding a portion of the chamber; directing current to an electrode to cause an arc between the electrode and the grounded portion of the chamber; and mixing the fuel and air with the grounded portion of the chamber. 23. The method of claim 22, further including selectively directing purge gas toward the electrode. 24. The method of claim 22, wherein the arc always propagates in a direction away from the injection of fuel.