Top 5 Signs of a Bad Fuel Injector

10 January 2012

Fuel injectors when fail can lead to a bunch of problems that can affect the engine performance. Nobody would love to come across such a snag, especially for those who have experienced the hefty repair charges from their local mechanics. There’s no substitute for replacement if the fuel injector is really bad. However, you can save other parts of the engine from getting damaged, if you manage well enough to look for the striking signs, which point towards a failing fuel injector. Here’s a list of the 5 most known signs that indicate a bad fuel injector.

Abrupt Engine Power

It is easy to understand that when a fuel injector is clogged, the fuel supply will be irregular too. With such lopsided flow, the engine will fluctuate between low and high rpm’s causing it to deliver the power in chunks, rather than being smooth and gradual.

Engine Misfire

In case when the injector keeps on struggling against the clogging of foreign particles, a time may come when it might miss out to supply the fuel completely when it is required to. Thus, the engine results to give a compromising performance. The engine will misfire which can be felt easily while driving. This is really a bad sign and requires immediate response because misfire would give rise to engine overheating and pre-igniting the fuel mixture.

Rough Idle

Damaged fuel injector will not only give weird problems while on the go, the effects will persist even when the engine is running idle. Instead of a smooth engine idle, it will be rough and irregular when the fuel supply is abrupt.

Leaking Fuel

Apart from those internal chokes, fuel injectors can turn out to be bad even due to external cracks developed on the exterior body part of the injector. This damage is common for those injectors fitted on to the intake manifold. These cracks can cause the fuel to leak from the body, rather than flowing through the nozzle, which can be seen and smelled easily. The leaking fuel, instead of being sprayed in atomized form, flows in the manifold in the form of droplets. This will cause the air fuel mixture to turn out
weak, giving out poor engine efficiency.

Reduced Gas Mileage

It is obvious, that a damaged fuel injector would either cause the fuel to be wasted by leaking from the body or would supply excessive fuel when the internal springs are damaged. These conditions will undoubtedly lead the car engine to run poor reducing the gas mileage.

Watch out for these most common signs in your car if you are suspecting the fuel injector to be faulty. Responding to these problems early can save a great amount of time and money and can also avoid damaging to other parts. Pay attention today itself and keep yourself away from paying extra for your auto repairs.


Author: John is a passionate auto expert aiming towards keeping the auto repairs simple and effective at no extra cost. He is sharing his best knowledge on nissan fuel injectors replacements.

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