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Re: harmonic noise 1400 rpms
Is it like a pulsating sound going between high and low frequencies? That's most likelt sympathetic vibrations between your engine and anything else with a similar natural frequency. Replacing the harmonic balancer on the front of the crankshaft may help (the rubber starts to separate when they get old), but it really isn't hurting anything.
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'04 Cavalier coupe M/T 2.2 Ecotec
Supercharged 14 PSI boost, charge air cooler, 42# injectors
Tuned with HP Tuners
Poly engine/trans/control arm bushings
Self built and self programmed progressive methanol injection system
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