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Injector o-rings seal the injector into a port of the intake manifold. Each injector sits in it's own runner of the intake manifold and when they wear out from becoming brittle with age and heat fluctuations they will become brittle, crack and cause a vacuum leak. Air that isn't metered through the MAF just behind the air filter will enter the intake manifold at the injectors where there should be an air tight seal. It will cause a miss at varying engine loads and maybe turn on the check engine light if the amount of air entering the engine through the vacuum leak is higher than the programmed tolerances.

I've got an 01 cvpi...same thing happened to me when I didn't replace them when I changed intake manifolds.

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15y ago

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