Fuel injector symptoms for bad, faulty, dirty, clogged, or leaking injectors can be:

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Starting issues
Smog can be caused due to bad fuel injector symptoms
Poor idle
Failed emissions
Poor Performance
Engine does not reach full RPM
Increased fuel consumption
Rough engine performance
Surging and bucking under various throttle loads
Smoke from the tail pipe
Engine Knock or Detonation which can lead to catastrophic engine failure
Pollution

Leaking Injectors will cause:
Increased Fuel ConsumptionLeaking fuel injectors is a fire hazard
Poor Idle
Fuel odors inside and around the car
Hard Starting
Poor Emissions
Oil thinning, which can lead to catastrophic engine failure
Hydro lock, which can lead to catastrophic engine failure