2003 Mazda Protege Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2003 Mazda Protege
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2003 Mazda Protege ProblemsIdles Rough, Misfires, and Possible Check Engine Light
A loose or corroded ground terminal on the driver's side of the cylinder head can cause a rough idle, misfires, and there may be trouble codes. Restore the ground to the cylinder head.
An electrically shorted air flow sensor can cause a crank-no start condition. Diagnosis may show that ignition spark is normal, and there are no trouble codes stored.
Misfires under load (acceleration) can be caused by leaky spark plug boots. When a spark plug boot leaks, it allows the spark to arc, or jump, to the cylinder head. New spark plug wires will be needed.
2003 Mazda Protege QuestionsGas coming out of exhaust (1 answer)
New coil pack, plugs, wires. Still running rough and didn't help. What else can be the problem?